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BuildProvider Class

Defines a set of properties and methods for generating source code within the ASP.NET build environment. This class is abstract.

Namespace: System.Web.Compilation
Assembly: System.Web (in system.web.dll)

'Declaration
Public MustInherit Class BuildProvider
'Usage
Dim instance As BuildProvider

public abstract class BuildProvider
public abstract class BuildProvider
Not applicable.

The ASP.NET build environment uses BuildProvider objects to generate source code for different file types within an application. Classes derived from BuildProvider predominantly provide source code for files, Web pages, resources, and other custom items.

Typically, you do not create an instance of the BuildProvider class directly. Instead, you implement a class that derives from BuildProvider, and configure the BuildProvider implementation for use within the ASP.NET build environment.

Instances of the BuildProvider class are used with AssemblyBuilder objects to build one or more files into a compiled assembly. A BuildProvider instance generates source code in the appropriate language for individual files, and the AssemblyBuilder object combines the source contributed by each BuildProvider instance into a single assembly.

The ASP.NET build environment uses instances of the BuildProvider class to build files within an application. The VirtualPath property of the BuildProvider class indicates the path of the file to be built. The file extension of each file within an application is mapped to a corresponding build provider. The ASP.NET build environment initializes a BuildProvider instance for each file based on the file extension, and uses the BuildProvider methods to generate source code for the file. The ASP.NET build environment passes an AssemblyBuilder object based on the preferred compiler language and the context of the file to the BuildProvider methods when building an assembly from one or more files, so that the BuildProvider instance can contribute source code for its file to the overall assembly.

To define custom build actions for a file type within an ASP.NET application, you must derive a class from BuildProvider, implement members within the derived class for building the file type, and configure the build provider for the corresponding file extension within the application configuration file.

The add element specifies the file extension for supported files, and whether the build provider supports code files, Web files, resource files or all files. Use the type attribute to specify the fully qualified type name of the build provider implementation. Use the appliesTo attribute to specify whether the build provider applies to files in the App_Code directory, to files in a Web content directory, to global or local resources, or to all files. Use the extension attribute to specify the file extension used to identify files that the BuildProvider class supports. Use the BuildProviderCollection class to examine build providers in a configuration file. For more information about configuring a build provider, see buildProviders Element for compilation (ASP.NET Settings Schema).

To implement a build provider that generates source code for a custom file type, derive a class from BuildProvider, and override the GenerateCode method to generate source code for the supported file type. The generated source is added to the AssemblyBuilder object in the form of a CodeDOM graph, or as content that represents a physical source code file. If the build provider requires a specific programming language, override the CodeCompilerType property to return a CompilerType object for the supported programming language. If the build provider does not require a specific programming language, do not override the CodeCompilerType property; use the base class implementation, which indicates that the build provider can use any .NET Framework language, such as Visual Basic or C#.

To implement a build provider that generates source code for Web content, derive a class from BuildProvider and override the GetGeneratedType method to return the Type for the class generated by BuildProvider. Override the GenerateCode method to generate source code for the type provided by the supported file.

TopicLocation
How To: Secure an ASP.NET Application on a Shared ServerBuilding ASP .NET Web Applications
How To: Secure an ASP.NET Application on a Shared ServerBuilding ASP .NET Web Applications

The following code example illustrates a simple build provider implementation, inheriting from the abstract BuildProvider base class. The build provider overrides the CodeCompilerType, GetGeneratedType, and GenerateCode members of the base class.

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections
Imports System.IO
Imports System.Text
Imports System.Web
Imports System.Web.Compilation
Imports System.CodeDom.Compiler
Imports System.CodeDom
Imports System.Security
Imports System.Security.Permissions

<PermissionSet(SecurityAction.Demand, Unrestricted := true)> _
Public Class SampleBuildProvider
    Inherits BuildProvider

    Protected _compilerType As CompilerType = Nothing

    Public Sub New()
        _compilerType = GetDefaultCompilerType()
    End Sub

    ' Return the internal CompilerType member 
    ' defined in this implementation.
    Public Overrides ReadOnly Property CodeCompilerType() As CompilerType
        Get
            CodeCompilerType = _compilerType
        End Get
    End Property


    ' Define the build provider implementation of the GenerateCode method.
    Public Overrides Sub GenerateCode(ByVal assemBuilder As AssemblyBuilder)
        ' Generate a code compile unit, and add it to
        ' the assembly builder.

        Dim tw As TextWriter = assemBuilder.CreateCodeFile(Me)
        If Not tw Is Nothing Then
            Try
                ' Generate the code compile unit from the virtual path.
                Dim compileUnit As CodeCompileUnit = _
                        SampleClassGenerator.BuildCompileUnitFromPath(VirtualPath)

                ' Generate the source for the code compile unit, 
                ' and write it to a file specified by the assembly builder.
                Dim provider As CodeDomProvider = assemBuilder.CodeDomProvider
                provider.GenerateCodeFromCompileUnit(compileUnit, tw, Nothing)
            Finally
                tw.Close()
            End Try

        End If
    End Sub

    Public Overrides Function GetGeneratedType(ByVal results As CompilerResults) As System.Type
        Dim typeName As String = SampleClassGenerator.TypeName

        Return results.CompiledAssembly.GetType(typeName)
    End Function

End Class

System.Object
  System.Web.Compilation.BuildProvider

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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