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CodeDomProvider Class

Provides a base class for CodeDomProvider implementations. This class is abstract.

For a list of all members of this type, see CodeDomProvider Members.

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.CodeDom.Compiler.CodeDomProvider
            Microsoft.CSharp.CSharpCodeProvider
            Microsoft.VisualBasic.VBCodeProvider

[Visual Basic]
MustInherit Public Class CodeDomProvider
   Inherits Component
[C#]
public abstract class CodeDomProvider : Component
[C++]
public __gc __abstract class CodeDomProvider : public Component
[JScript]
public abstract class CodeDomProvider extends Component

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Remarks

A CodeDomProvider can be used to create and retrieve instances of code generators and code compilers. Code generators can be used to generate code in a particular language, and code compilers can be used to compile code into assemblies.

A CodeDomProvider implementation typically provides code generation and/or code compilation interfaces for generating code and managing compilation for a single programming language. Several languages are supported by CodeDomProvider implementations that ship with the .NET Framework SDK. These languages include C#, Visual Basic, Managed C++, J#.NET, and JScript. Developers or compiler vendors can implement the ICodeGenerator and ICodeCompiler interfaces and provide a CodeDomProvider that extends CodeDom support to other programming languages.

Example

[Visual Basic, C#, C++] The following example program can generate and compile source code based on a CodeDOM model of a program that prints "Hello World" using the System.Console class. A Windows Forms user interface is provided. The user can select the target programming langauge from several selections: C#, Visual Basic, and JScript.

[Visual Basic] 
Imports System
Imports System.CodeDom
Imports System.CodeDom.Compiler
Imports System.Collections
Imports System.ComponentModel
Imports System.Diagnostics
Imports System.Drawing
Imports System.IO
Imports System.Windows.Forms
Imports Microsoft.CSharp
Imports Microsoft.VisualBasic
Imports Microsoft.JScript

' This example demonstrates building a Hello World program graph 
' using System.CodeDom elements. It calls code generator and
' code compiler methods to build the program using CSharp, VB, or
' JScript.  A Windows Forms interface is included. Note: Code
' must be compiled and linked with the Microsoft.JScript assembly. 
Namespace CodeDOMExample
   
    Public Class CodeDomExample
        ' Build a Hello World program graph using 
        ' System.CodeDom types.
        Public Shared Function BuildHelloWorldGraph() As CodeCompileUnit

            ' Create a new CodeCompileUnit to contain 
            ' the program graph.
            Dim compileUnit As New CodeCompileUnit()
      
            ' Declare a new namespace called Samples.
            Dim samples As New CodeNamespace("Samples")

            ' Add the new namespace to the compile unit.
            compileUnit.Namespaces.Add(samples)
      
            ' Add the new namespace import for the System namespace.
            samples.Imports.Add(New CodeNamespaceImport("System"))
      
            ' Declare a new type called Class1.
            Dim class1 As New CodeTypeDeclaration("Class1")

            ' Add the new type to the namespace type collection.
            samples.Types.Add(class1)
      
            ' Declare a new code entry point method.
            Dim start As New CodeEntryPointMethod()
      
            ' Create a type reference for the System.Console class.
            Dim csSystemConsoleType As New CodeTypeReferenceExpression( _
                "System.Console")
      
            ' Build a Console.WriteLine statement.
            Dim cs1 As New CodeMethodInvokeExpression( _
                csSystemConsoleType, "WriteLine", _
                New CodePrimitiveExpression("Hello World!"))

            ' Add the WriteLine call to the statement collection.
            start.Statements.Add(cs1)
      
            ' Build another Console.WriteLine statement.
            Dim cs2 As New CodeMethodInvokeExpression( _
                csSystemConsoleType, "WriteLine", _
                New CodePrimitiveExpression("Press the Enter key to continue."))

            ' Add the WriteLine call to the statement collection.
            start.Statements.Add(cs2)
      
            ' Build a call to System.Console.ReadLine.
            Dim csReadLine As New CodeMethodInvokeExpression( _
                csSystemConsoleType, "ReadLine")
    
            ' Add the ReadLine statement.
            start.Statements.Add(csReadLine)
      
            ' Add the code entry point method to
            ' the Members collection of the type.
            class1.Members.Add(start)
      
            Return compileUnit
        End Function 

        Public Shared Sub GenerateCode(ByVal provider As CodeDomProvider, ByVal compileunit As CodeCompileUnit)
            
            ' Build the source file name with the appropriate
            ' language extension.
            Dim sourceFile As String
            If provider.FileExtension.StartsWith(".")
                sourceFile = "TestGraph" + provider.FileExtension
            Else
                sourceFile = "TestGraph." + provider.FileExtension
            End If

            ' Obtain an ICodeGenerator from the CodeDomProvider.
            Dim gen As ICodeGenerator = provider.CreateGenerator()

            ' Create an IndentedTextWriter, constructed with
            ' a StreamWriter to the source file.
            Dim tw As New IndentedTextWriter(New StreamWriter(sourceFile, False), "    ")
            ' Generate source code using the code generator.
            gen.GenerateCodeFromCompileUnit(compileunit, tw, New CodeGeneratorOptions())
            ' Close the output file.
            tw.Close()
        End Sub 

        Public Shared Function CompileCode(ByVal provider As CodeDomProvider, _
                                           ByVal sourceFile As string,        _
                                           ByVal exeFile As string) As CompilerResults
            ' Obtain an ICodeCompiler from the CodeDomProvider.
            Dim compiler As ICodeCompiler = provider.CreateCompiler()

            ' Configure a CompilerParameters that links System.dll
            ' and produces the specified executable file.
            Dim referenceAssemblies As String() = {"System.dll"}
            Dim cp As New CompilerParameters(referenceAssemblies, exeFile, False)
            
            ' Generate an executable rather than a DLL file.
            cp.GenerateExecutable = True

            ' Invoke compilation.
            Dim cr As CompilerResults = compiler.CompileAssemblyFromFile(cp, _
                sourceFile)
            ' Return the results of compilation.
            Return cr
        End Function 
    End Class 
    
    Public Class CodeDomExampleForm
        Inherits System.Windows.Forms.Form
        Private run_button As New System.Windows.Forms.Button()
        Private compile_button As New System.Windows.Forms.Button()
        Private generate_button As New System.Windows.Forms.Button()
        Private textBox1 As New System.Windows.Forms.TextBox()
        Private comboBox1 As New System.Windows.Forms.ComboBox()
        Private label1 As New System.Windows.Forms.Label()

        Private Sub generate_button_Click(ByVal sender As Object, ByVal e As System.EventArgs)
            Dim provider As CodeDomProvider = GetCurrentProvider()
            CodeDomExample.GenerateCode(provider, CodeDomExample.BuildHelloWorldGraph())

            ' Build the source file name with the appropriate
            ' language extension.
            Dim sourceFile As String
            If provider.FileExtension.StartsWith(".")
                sourceFile = "TestGraph" + provider.FileExtension
            Else
                sourceFile = "TestGraph." + provider.FileExtension
            End If

            ' Read in the generated source file and
            ' display the source text.
            Dim sr As New StreamReader(sourceFile)
            textBox1.Text = sr.ReadToEnd()
            sr.Close()
        End Sub 

        Private Sub compile_button_Click(ByVal sender As Object, ByVal e As System.EventArgs)
            Dim provider As CodeDomProvider = GetCurrentProvider()

            ' Build the source file name with the appropriate
            ' language extension.
            Dim sourceFile As String
            If provider.FileExtension.StartsWith(".")
                sourceFile = "TestGraph" + provider.FileExtension
            Else
                sourceFile = "TestGraph." + provider.FileExtension
            End If

            Dim cr As CompilerResults = CodeDomExample.CompileCode(provider,     _
                                                                   sourceFile,   _
                                                                   "TestGraph.EXE")

            If cr.Errors.Count > 0 Then
                ' Display compilation errors.
                textBox1.Text = "Errors encountered while building " + _
                                sourceFile + " into " +                _ 
                                cr.PathToAssembly + ": " + ControlChars.CrLf

                Dim ce As System.CodeDom.Compiler.CompilerError
                For Each ce In cr.Errors
                    textBox1.AppendText(ce.ToString() + ControlChars.CrLf)
                Next ce
                run_button.Enabled = False
            Else
                textBox1.Text = "Source " + sourceFile + " built into " + _
                                cr.PathToAssembly + " with no errors."
                run_button.Enabled = True
            End If        
        End Sub 

        Private Sub run_button_Click(ByVal sender As Object, _
            ByVal e As System.EventArgs)

            Process.Start("TestGraph.EXE")
        End Sub 

        Private Function GetCurrentProvider() As CodeDomProvider

            Dim provider As CodeDomProvider
            Select Case CStr(Me.comboBox1.SelectedItem)
                Case "CSharp"
                    provider = New CSharpCodeProvider()
                Case "Visual Basic"
                    provider = New VBCodeProvider()
                Case "JScript"
                    provider = New JScriptCodeProvider()
                Case Else
                    provider = New CSharpCodeProvider()
            End Select
            Return provider
        End Function

        Public Sub New()
            Me.SuspendLayout()
            ' Set properties for label1.
            Me.label1.Location = New System.Drawing.Point(395, 20)
            Me.label1.Size = New Size(180, 22)
            Me.label1.Text = "Select a programming language:"
            ' Set properties for comboBox1.
            Me.comboBox1.Location = New System.Drawing.Point(560, 16)
            Me.comboBox1.Size = New Size(190, 23)
            Me.comboBox1.Name = "comboBox1"
            Me.comboBox1.Items.AddRange(New String() {"CSharp", "Visual Basic", "JScript"})
            Me.comboBox1.Anchor = System.Windows.Forms.AnchorStyles.Left Or System.Windows.Forms.AnchorStyles.Right Or System.Windows.Forms.AnchorStyles.Top
            Me.comboBox1.SelectedIndex = 0
            ' Set properties for generate_button.
            Me.generate_button.Location = New System.Drawing.Point(8, 16)
            Me.generate_button.Name = "generate_button"
            Me.generate_button.Size = New System.Drawing.Size(120, 23)
            Me.generate_button.Text = "Generate Code"
            AddHandler generate_button.Click, AddressOf Me.generate_button_Click
            ' Set properties for compile_button.
            Me.compile_button.Location = New System.Drawing.Point(136, 16)
            Me.compile_button.Name = "compile_button"
            Me.compile_button.Size = New System.Drawing.Size(120, 23)
            Me.compile_button.Text = "Compile"
            AddHandler compile_button.Click, AddressOf Me.compile_button_Click
            ' Set properties for run_button.
            Me.run_button.Enabled = False
            Me.run_button.Location = New System.Drawing.Point(264, 16)
            Me.run_button.Name = "run_button"
            Me.run_button.Size = New System.Drawing.Size(120, 23)
            Me.run_button.Text = "Run"
            AddHandler run_button.Click, AddressOf Me.run_button_Click
            ' Set properties for textBox1.
            Me.textBox1.Anchor = System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left Or System.Windows.Forms.AnchorStyles.Right
            Me.textBox1.Location = New System.Drawing.Point(8, 48)
            Me.textBox1.Multiline = True
            Me.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
            Me.textBox1.Name = "textBox1"
            Me.textBox1.Size = New System.Drawing.Size(744, 280)
            Me.textBox1.Text = ""
            ' Set properties for the CodeDomExampleForm.
            Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
            Me.ClientSize = New System.Drawing.Size(768, 340)
            Me.MinimumSize = New System.Drawing.Size(750, 340)
            Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.textBox1, _
                Me.run_button, Me.compile_button, Me.generate_button, _
                Me.comboBox1, Me.label1})
            Me.Name = "CodeDomExampleForm"
            Me.Text = "CodeDom Hello World Example"
            Me.ResumeLayout(False)
        End Sub 

        Protected Overloads Sub Dispose(ByVal disposing As Boolean)
            MyBase.Dispose(disposing)
        End Sub 

        <STAThread()> _
        Shared Sub Main()
            Application.Run(New CodeDomExampleForm())
        End Sub 
    End Class 
End Namespace 

[C#] 
using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using Microsoft.CSharp;
using Microsoft.VisualBasic;
using Microsoft.JScript;
    
// This example demonstrates building a Hello World program graph 
// using System.CodeDom elements. It calls code generator and
// code compiler methods to build the program using CSharp, VB, or
// JScript.  A Windows Forms interface is included. Note: Code
// must be compiled and linked with the Microsoft.JScript assembly. 
namespace CodeDOMExample
{    
    public class CodeDomExample
    {
        // Build a Hello World program graph using 
        // System.CodeDom types.
        public static CodeCompileUnit BuildHelloWorldGraph()
        {
            // Create a new CodeCompileUnit to contain 
            // the program graph.
            CodeCompileUnit compileUnit = new CodeCompileUnit();

            // Declare a new namespace called Samples.
            CodeNamespace samples = new CodeNamespace("Samples");
            // Add the new namespace to the compile unit.
            compileUnit.Namespaces.Add( samples );

            // Add the new namespace import for the System namespace.
            samples.Imports.Add( new CodeNamespaceImport("System") );            

            // Declare a new type called Class1.
            CodeTypeDeclaration class1 = new CodeTypeDeclaration("Class1");
            // Add the new type to the namespace type collection.
            samples.Types.Add(class1);
            
            // Declare a new code entry point method.
            CodeEntryPointMethod start = new CodeEntryPointMethod();

            // Create a type reference for the System.Console class.
            CodeTypeReferenceExpression csSystemConsoleType = new CodeTypeReferenceExpression("System.Console");

            // Build a Console.WriteLine statement.
            CodeMethodInvokeExpression cs1 = new CodeMethodInvokeExpression( 
                csSystemConsoleType, "WriteLine", 
                new CodePrimitiveExpression("Hello World!") );

            // Add the WriteLine call to the statement collection.
            start.Statements.Add(cs1);

            // Build another Console.WriteLine statement.
            CodeMethodInvokeExpression cs2 = new CodeMethodInvokeExpression(
                csSystemConsoleType, "WriteLine",
                new CodePrimitiveExpression("Press the Enter key to continue.") );

            // Add the WriteLine call to the statement collection.
            start.Statements.Add(cs2);

            // Build a call to System.Console.ReadLine.
            CodeMethodInvokeExpression csReadLine = new CodeMethodInvokeExpression(
                csSystemConsoleType, "ReadLine");

            // Add the ReadLine statement.
            start.Statements.Add(csReadLine);

            // Add the code entry point method to
            // the Members collection of the type.
            class1.Members.Add( start );

            return compileUnit;
        }        

        public static void GenerateCode(CodeDomProvider provider, 
            CodeCompileUnit compileunit)
        {
            // Build the source file name with the appropriate
            // language extension.
            String sourceFile;
            if (provider.FileExtension[0] == '.')
            {
                sourceFile = "TestGraph" + provider.FileExtension;
            }
            else 
            {
                sourceFile = "TestGraph." + provider.FileExtension;
            }

            // Obtain an ICodeGenerator from the CodeDomProvider.
            ICodeGenerator gen = provider.CreateGenerator();
            // Create an IndentedTextWriter, constructed with
            // a StreamWriter to the source file.
            IndentedTextWriter tw = new IndentedTextWriter(new StreamWriter(sourceFile, false), "    ");
            // Generate source code using the code generator.
            gen.GenerateCodeFromCompileUnit(compileunit, tw, new CodeGeneratorOptions());
            // Close the output file.
            tw.Close();            
        }

        public static CompilerResults CompileCode(CodeDomProvider provider, 
                                                  String sourceFile, 
                                                  String exeFile)
        {
            // Obtain an ICodeCompiler from the CodeDomProvider.
            ICodeCompiler compiler = provider.CreateCompiler();
            // Configure a CompilerParameters that links System.dll
            // and produces the specified executable file.
            String [] referenceAssemblies = {"System.dll"};
            CompilerParameters cp = new CompilerParameters(referenceAssemblies,
                                                           exeFile, false);
            // Generate an executable rather than a DLL file.
            cp.GenerateExecutable = true;            

            // Invoke compilation.
            CompilerResults cr = compiler.CompileAssemblyFromFile(cp, sourceFile);
            // Return the results of compilation.
            return cr;
        }
    }

    public class CodeDomExampleForm : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button run_button = new System.Windows.Forms.Button();
        private System.Windows.Forms.Button compile_button = new System.Windows.Forms.Button();
        private System.Windows.Forms.Button generate_button = new System.Windows.Forms.Button();
        private System.Windows.Forms.TextBox textBox1 = new System.Windows.Forms.TextBox();
        private System.Windows.Forms.ComboBox comboBox1 = new System.Windows.Forms.ComboBox();
        private System.Windows.Forms.Label label1 = new System.Windows.Forms.Label();
        
        private void generate_button_Click(object sender, System.EventArgs e)
        {
            CodeDomProvider provider = GetCurrentProvider();
            CodeDomExample.GenerateCode(provider, CodeDomExample.BuildHelloWorldGraph());

            // Build the source file name with the appropriate
            // language extension.
            String sourceFile;
            if (provider.FileExtension[0] == '.')
            {
                sourceFile = "TestGraph" + provider.FileExtension;
            }
            else 
            {
                sourceFile = "TestGraph." + provider.FileExtension;
            }
            
            // Read in the generated source file and
            // display the source text.
            StreamReader sr = new StreamReader(sourceFile);
            textBox1.Text = sr.ReadToEnd();
            sr.Close();
        }

        private void compile_button_Click(object sender, System.EventArgs e)
        {
            CodeDomProvider provider = GetCurrentProvider();

            // Build the source file name with the appropriate
            // language extension.
            String sourceFile;
            if (provider.FileExtension[0] == '.')
            {
                sourceFile = "TestGraph" + provider.FileExtension;
            }
            else 
            {
                sourceFile = "TestGraph." + provider.FileExtension;
            }

            // Compile the source file into an executable output file.
            CompilerResults cr = CodeDomExample.CompileCode(provider, 
                                                            sourceFile, 
                                                            "TestGraph.exe");

            if(cr.Errors.Count > 0)
            {
                // Display compilation errors.
                textBox1.Text = "Errors encountered while building " + 
                                sourceFile + " into " +cr.PathToAssembly+": \r\n\n";
                foreach(CompilerError ce in cr.Errors)                
                    textBox1.AppendText(ce.ToString()+"\r\n");                                
                run_button.Enabled = false;
            }
            else
            {
                textBox1.Text = "Source " + sourceFile + " built into " + 
                                cr.PathToAssembly+" with no errors.";
                run_button.Enabled = true;
            }
        }

        private void run_button_Click(object sender, 
            System.EventArgs e)
        {
            Process.Start("TestGraph.exe");            
        }
        
        private CodeDomProvider GetCurrentProvider()
        {
            CodeDomProvider provider;
            switch((string)this.comboBox1.SelectedItem)
            {
                case "CSharp":
                    provider = new CSharpCodeProvider();
                    break;
                case "Visual Basic":
                    provider = new VBCodeProvider();
                    break;
                case "JScript":
                    provider = new JScriptCodeProvider();
                    break;
                default:
                    provider = new CSharpCodeProvider();
                    break;
            }
            return provider;
        }

        public CodeDomExampleForm()
        {
            this.SuspendLayout();            
            // Set properties for label1
            this.label1.Location = new System.Drawing.Point(395, 20);
            this.label1.Size = new Size(180, 22);
            this.label1.Text = "Select a programming language:";            
            // Set properties for comboBox1
            this.comboBox1.Location = new System.Drawing.Point(560, 16);
            this.comboBox1.Size = new Size(190, 23);
            this.comboBox1.Name = "comboBox1";
            this.comboBox1.Items.AddRange( new string[] { "CSharp", "Visual Basic", "JScript" } );
            this.comboBox1.Anchor = System.Windows.Forms.AnchorStyles.Left
                                    | System.Windows.Forms.AnchorStyles.Right 
                                    | System.Windows.Forms.AnchorStyles.Top;
            this.comboBox1.SelectedIndex = 0;
            // Set properties for generate_button. 
            this.generate_button.Location = new System.Drawing.Point(8, 16);
            this.generate_button.Name = "generate_button";
            this.generate_button.Size = new System.Drawing.Size(120, 23);            
            this.generate_button.Text = "Generate Code";
            this.generate_button.Click += new System.EventHandler(this.generate_button_Click);            
            // Set properties for compile_button.
            this.compile_button.Location = new System.Drawing.Point(136, 16);
            this.compile_button.Name = "compile_button";
            this.compile_button.Size = new System.Drawing.Size(120, 23);            
            this.compile_button.Text = "Compile";
            this.compile_button.Click += new System.EventHandler(this.compile_button_Click);            
            // Set properties for run_button.
            this.run_button.Enabled = false;
            this.run_button.Location = new System.Drawing.Point(264, 16);
            this.run_button.Name = "run_button";
            this.run_button.Size = new System.Drawing.Size(120, 23);            
            this.run_button.Text = "Run";
            this.run_button.Click += new System.EventHandler(this.run_button_Click);            
            // Set properties for textBox1.        
            this.textBox1.Anchor = (System.Windows.Forms.AnchorStyles.Top
                                     | System.Windows.Forms.AnchorStyles.Bottom
                                     | System.Windows.Forms.AnchorStyles.Left 
                                     | System.Windows.Forms.AnchorStyles.Right);
            this.textBox1.Location = new System.Drawing.Point(8, 48);
            this.textBox1.Multiline = true;
            this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(744, 280);            
            this.textBox1.Text = "";            
            // Set properties for the CodeDomExampleForm.
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(768, 340);
            this.MinimumSize = new System.Drawing.Size(750, 340);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {this.textBox1, 
                this.run_button, this.compile_button, this.generate_button,
                this.comboBox1, this.label1 });
            this.Name = "CodeDomExampleForm";
            this.Text = "CodeDom Hello World Example";
            this.ResumeLayout(false);
        }

        protected override void Dispose( bool disposing )
        {
            base.Dispose( disposing );
        }

        [STAThread]
        static void Main() 
        {
            Application.Run(new CodeDomExampleForm());
        }
    }
}

[C++] 
#using <mscorlib.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
#using <System.dll>
#using <Microsoft.JScript.dll>
#using <Cscompmgd.dll>

using namespace System;
using namespace System::CodeDom;
using namespace System::CodeDom::Compiler;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::Diagnostics;
using namespace System::Drawing;
using namespace System::IO;
using namespace System::Windows::Forms;
using namespace Microsoft::CSharp;
using namespace Microsoft::VisualBasic;
using namespace Microsoft::JScript;

// This example demonstrates building a Hello World program graph 
// using System.CodeDom elements. It calls code generator and
// code compiler methods to build the program using CSharp, VB, or
// JScript.  A Windows Forms interface is included. Note: Code
// must be compiled and linked with the Microsoft.JScript assembly. 
namespace CodeDOMExample {

  public __gc class CodeDomExample 
  {
    public:
        // Build a Hello World program graph using 
        // System::CodeDom types.
        static CodeCompileUnit *BuildHelloWorldGraph()
        {            
            // Create a new CodeCompileUnit to contain 
            // the program graph.
            CodeCompileUnit* compileUnit = new CodeCompileUnit();

            // Declare a new namespace called Samples.
            CodeNamespace* samples = new CodeNamespace(S"Samples");
            // Add the new namespace to the compile unit.
            compileUnit->Namespaces->Add(samples);

            // Add the new namespace import for the System namespace.
            samples->Imports->Add(new CodeNamespaceImport(S"System"));

            // Declare a new type called Class1.
            CodeTypeDeclaration* class1 = new CodeTypeDeclaration(S"Class1");
            // Add the new type to the namespace's type collection.
            samples->Types->Add(class1);

            // Declare a new code entry point method.
            CodeEntryPointMethod* start = new CodeEntryPointMethod();

            CodePrimitiveExpression *codePrimitive[] = new CodePrimitiveExpression*[1];

            // Create a type reference for the System::Console class.
            CodeTypeReferenceExpression *csSystemConsoleType = new CodeTypeReferenceExpression(S"System.Console");

            // Build a Console::WriteLine statement.
            codePrimitive[0] = new CodePrimitiveExpression(S"Hello World!");
            CodeMethodInvokeExpression* cs1 = new CodeMethodInvokeExpression(
                csSystemConsoleType, 
                S"WriteLine",
                static_cast<CodeExpression __gc * __gc[]>(codePrimitive)
                );

            // Add the WriteLine call to the statement collection.
            start->Statements->Add(cs1);

            // Build another Console::WriteLine statement.
            codePrimitive[0] = new CodePrimitiveExpression(S"Press the Enter key to continue.");
            CodeMethodInvokeExpression* cs2 = new CodeMethodInvokeExpression(
                csSystemConsoleType, 
                S"WriteLine",
                static_cast<CodeExpression __gc * __gc[]>(codePrimitive)
                );
            // Add the WriteLine call to the statement collection.
            start->Statements->Add(cs2);

            // Build a call to System::Console::ReadLine.
            CodeMethodReferenceExpression *csReadLine = new CodeMethodReferenceExpression(
                csSystemConsoleType, "ReadLine");

            CodeExpression *blankParms[] = new CodeExpression*[0];
            CodeMethodInvokeExpression *cs3 = new CodeMethodInvokeExpression(
                csReadLine, static_cast<CodeExpression __gc * __gc[]>(blankParms));

            // Add the ReadLine statement.
            start->Statements->Add(cs3);

            // Add the code entry point method to
            // the Members collection of the type.
            class1->Members->Add(start);

            return compileUnit;
        }

    public:
        static void GenerateCode(CodeDomProvider* provider, CodeCompileUnit* compileunit)
        {
            // Build the source file name with the appropriate
            // language extension.
            String *sourceFile;
            if (provider->FileExtension->StartsWith(S"."))
            {
                sourceFile = String::Concat(S"TestGraph", 
                    provider->FileExtension);
            }
            else 
            {
                sourceFile = String::Concat(S"TestGraph.", 
                    provider->FileExtension);
            }   

            // Obtain an ICodeGenerator* from the CodeDomProvider.
            ICodeGenerator* gen = provider->CreateGenerator();
            // Create an IndentedTextWriter, constructed with
            // a StreamWriter to the source file.
            IndentedTextWriter* tw = new IndentedTextWriter(new StreamWriter(sourceFile, false), S"    ");
            // Generate source code using the code generator.
            gen->GenerateCodeFromCompileUnit(compileunit, tw, new CodeGeneratorOptions());
            // Close the output file.
            tw->Close();
        }

    public:
        static CompilerResults * CompileCode(CodeDomProvider* provider, String* sourceFile, String *exeFile)
        {
            // Obtain an ICodeCompiler* from the CodeDomProvider.
            ICodeCompiler* compiler = provider->CreateCompiler();
            // Configure a CompilerParameters that links System.dll
            // and produces the specified executable file.
            String* referenceAssemblies [] = {S"System.dll"};
            CompilerParameters* cp = new CompilerParameters(referenceAssemblies, 
                exeFile, false);
            // Generate an executable rather than a DLL file.
            cp->GenerateExecutable = true;

            // Invoke compilation.
            CompilerResults* cr = compiler->CompileAssemblyFromFile(cp, sourceFile);
            // Return the results of compilation.
            return cr;
        }
  };

  public __gc class CodeDomExampleForm : public System::Windows::Forms::Form 
  {
    private:
        static System::Windows::Forms::Button* run_button = new System::Windows::Forms::Button();
    private:
        static System::Windows::Forms::Button* compile_button = new System::Windows::Forms::Button();
    private:
        static System::Windows::Forms::Button* generate_button = new System::Windows::Forms::Button();
    private:
        static System::Windows::Forms::TextBox* textBox1 = new System::Windows::Forms::TextBox();
    private:
        static System::Windows::Forms::ComboBox* comboBox1 = new System::Windows::Forms::ComboBox();
    private:
        static System::Windows::Forms::Label* label1 = new System::Windows::Forms::Label();
 
    private:
        void generate_button_Click(Object* /*sender*/, System::EventArgs* /*e*/) 
        {
            CodeDomProvider* provider = GetCurrentProvider();
            CodeDomExample::GenerateCode(provider, CodeDomExample::BuildHelloWorldGraph());

            // Build the source file name with the appropriate
            // language extension.
            String *sourceFile;
            if (provider->FileExtension->StartsWith(S"."))
            {
                sourceFile = String::Concat(S"TestGraph", 
                    provider->FileExtension);
            }
            else 
            {
                sourceFile = String::Concat(S"TestGraph.", 
                    provider->FileExtension);
            }   

            // Read in the generated source file and
            // display the source text.
            StreamReader* sr = new StreamReader(sourceFile);
            textBox1->Text = sr->ReadToEnd();
            sr->Close();
        }

    private:
        CodeDomProvider * GetCurrentProvider() 
        {
            CodeDomProvider* provider;
            if ( String::Compare(dynamic_cast<String*>(this->comboBox1->SelectedItem), S"CSharp") == 0 )
                provider = new CSharpCodeProvider();
            else if ( String::Compare(dynamic_cast<String*>(this->comboBox1->SelectedItem), S"Visual Basic") == 0 )
                provider = new VBCodeProvider();
            else if ( String::Compare(dynamic_cast<String*>(this->comboBox1->SelectedItem), S"JScript") == 0 )
                provider = new JScriptCodeProvider();
            else
                provider = new CSharpCodeProvider();
            return provider;
        }

    private:
        void compile_button_Click(Object* /*sender*/, System::EventArgs* /*e*/) 
        {
            CodeDomProvider* provider = GetCurrentProvider();

            // Build the source file name with the appropriate
            // language extension.
            String *sourceFile = String::Concat(S"TestGraph.", provider->FileExtension);

            // Compile the source file into an executable output file.
            CompilerResults* cr = CodeDomExample::CompileCode(provider, sourceFile, S"TestGraph.exe");

            if (cr->Errors->Count > 0) 
            {
                // Display compilation errors.
                textBox1->Text = String::Concat(S"Errors encountered while building ",
                    sourceFile, S" into ", cr->PathToAssembly, S": \r\n\n");
                System::CodeDom::Compiler::CompilerError* ce;
                for (int i=0; i<cr->Errors->Count; i++)
                {
                    ce = cr->Errors->get_Item(i);
 
                    textBox1->AppendText(String::Concat(ce->ToString(), S"\r\n"));
                }
                run_button->Enabled = false;

            } else {

                textBox1->Text = String::Concat(S"Source ", sourceFile, S" built into ",
                    cr->PathToAssembly, S" with no errors.");

                run_button->Enabled = true;
            }
        }

    private:
        void run_button_Click(Object* /*sender*/, System::EventArgs* /*e*/) 
        {
            Process::Start(S"TestGraph.exe");
        }

    public:
        CodeDomExampleForm() 
        {
            this->SuspendLayout();
            // Set properties for label1.
            this->label1->Location = System::Drawing::Point(395, 20);
            this->label1->Size =  System::Drawing::Size(180, 22);
            this->label1->Text = S"Select a programming language:";
            // Set properties for comboBox1.
            this->comboBox1->Location = System::Drawing::Point(560, 16);
            this->comboBox1->Size = System::Drawing::Size(190, 23);
            this->comboBox1->Name = S"comboBox1";
            String* temp1 [] = {S"CSharp", S"Visual Basic", S"JScript" };
            this->comboBox1->Items->AddRange(temp1);
            this->comboBox1->Anchor = (System::Windows::Forms::AnchorStyles)(System::Windows::Forms::AnchorStyles::Left |
                System::Windows::Forms::AnchorStyles::Right | System::Windows::Forms::AnchorStyles::Top);
            this->comboBox1->SelectedIndex = 0;
            // Set properties for generate_button.
            this->generate_button->Location = System::Drawing::Point(8, 16);
            this->generate_button->Name = S"generate_button";
            this->generate_button->Size =  System::Drawing::Size(120, 23);
            this->generate_button->Text = S"Generate Code";
            this->generate_button->Click += new System::EventHandler(this, &CodeDomExampleForm::generate_button_Click);
            // Set properties for compile_button.
            this->compile_button->Location = System::Drawing::Point(136, 16);
            this->compile_button->Name = S"compile_button";
            this->compile_button->Size = System::Drawing::Size(120, 23);
            this->compile_button->Text = S"Compile";
            this->compile_button->Click += new System::EventHandler(this, &CodeDomExampleForm::compile_button_Click);
            // Set properties for run_button.
            this->run_button->Enabled = false;
            this->run_button->Location = System::Drawing::Point(264, 16);
            this->run_button->Name = S"run_button";
            this->run_button->Size = System::Drawing::Size(120, 23);
            this->run_button->Text = S"Run";
            this->run_button->Click += new System::EventHandler(this, &CodeDomExampleForm::run_button_Click);
            // Set properties for textBox1.
            this->textBox1->Anchor = (System::Windows::Forms::AnchorStyles)(System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Bottom
                | System::Windows::Forms::AnchorStyles::Left
                | System::Windows::Forms::AnchorStyles::Right);
            this->textBox1->Location = System::Drawing::Point(8, 48);
            this->textBox1->Multiline = true;
            this->textBox1->ScrollBars = System::Windows::Forms::ScrollBars::Vertical;
            this->textBox1->Name = S"textBox1";
            this->textBox1->Size = System::Drawing::Size(744, 280);
            this->textBox1->Text = S"";
            // Set properties for the CodeDomExampleForm.
            this->AutoScaleBaseSize = System::Drawing::Size(5, 13);
            this->ClientSize = System::Drawing::Size(768, 340);
            this->MinimumSize = System::Drawing::Size(750, 340);
            System::Windows::Forms::Control* myControl[] = {this->textBox1, 
                this->run_button, this->compile_button,
                this->generate_button, this->comboBox1, this->label1};
            this->Controls->AddRange(myControl);
            this->Name = S"CodeDomExampleForm";
            this->Text = S"CodeDom Hello World Example";
            this->ResumeLayout(false);
        }

    protected:
        void Dispose(bool disposing) 
        {
            __super::Dispose(disposing);
        }
  };
}

[STAThread]
int main() 
{
    Application::Run(new CodeDOMExample::CodeDomExampleForm());
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.CodeDom.Compiler

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: System (in System.dll)

See Also

CodeDomProvider Members | System.CodeDom.Compiler Namespace

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