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CodeCompileUnit Class

Provides a container for a CodeDOM program graph.

Namespace:  System.CodeDom
Assembly:  System (in System.dll)

public class CodeCompileUnit : CodeObject

CodeCompileUnit provides a container for a CodeDOM program graph.

CodeCompileUnit contains a collection that can store CodeNamespace objects containing CodeDOM source code graphs, along with a collection of assemblies referenced by the project, and a collection of attributes for the project assembly.

A CodeCompileUnit can be passed to the GenerateCodeFromCompileUnit method of an ICodeGenerator implementation along with other parameters to generate code based on the program graph contained by the compile unit.


Some languages support only a single namespace that contains a single class in a compile unit.

The following code example constructs a CodeCompileUnit that models the program structure of a simple "Hello World" program. This code example is part of a larger example that also produces code from this model, and is provided for the CodeDomProvider class.

// 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.

    // 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.

    // 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.

    // 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.

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

    // Add the ReadLine statement.

    // Add the code entry point method to 
    // the Members collection of the type.

    return compileUnit;

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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0