CodeAttributeArgument Class

Definition

Namespace:

System.CodeDom

Assembly:

System.CodeDom.dll

Represents an argument used in a metadata attribute declaration.

public ref class CodeAttributeArgument

public class CodeAttributeArgument

type CodeAttributeArgument = class

Public Class CodeAttributeArgument

Inheritance

Object

CodeAttributeArgument

Examples

The following code creates a class, and adds code attributes to declare that the class is serializable and obsolete.

#using <System.dll>
#using <System.Xml.dll>

using namespace System;
using namespace System::CodeDom;
using namespace System::CodeDom::Compiler;

int main()
{
    // Declare a new type called Class1.
    CodeTypeDeclaration^ class1 = gcnew CodeTypeDeclaration("Class1");

    // Use attributes to mark the class as serializable and obsolete.
    CodeAttributeDeclaration^ codeAttrDecl =
        gcnew CodeAttributeDeclaration("System.Serializable");
    class1->CustomAttributes->Add(codeAttrDecl);

    CodeAttributeArgument^ codeAttr =
        gcnew CodeAttributeArgument( gcnew CodePrimitiveExpression("This class is obsolete."));
    codeAttrDecl = gcnew CodeAttributeDeclaration("System.Obsolete", codeAttr);
    class1->CustomAttributes->Add(codeAttrDecl);

    // Create a C# code provider
    CodeDomProvider^ provider = CodeDomProvider::CreateProvider("CSharp");

    // Generate code and send the output to the console
    provider->GenerateCodeFromType(class1, Console::Out, gcnew CodeGeneratorOptions());
}

// The CPP code generator produces the following source code for the preceeding example code:
//
//[System.Serializable()]
//[System.Obsolete("This class is obsolete.")]
//public class Class1 {
//}

using System;
using System.CodeDom;
using System.CodeDom.Compiler;

public class CodeGenExample
{
    static void Main()
    {
        // Declare a new type called Class1.
        CodeTypeDeclaration class1 = new CodeTypeDeclaration("Class1");

        // Use attributes to mark the class as serializable and obsolete.
        CodeAttributeDeclaration codeAttrDecl =
            new CodeAttributeDeclaration("System.Serializable");
        class1.CustomAttributes.Add(codeAttrDecl);

        CodeAttributeArgument codeAttr =
            new CodeAttributeArgument( new CodePrimitiveExpression("This class is obsolete."));
        codeAttrDecl = new CodeAttributeDeclaration("System.Obsolete", codeAttr);
        class1.CustomAttributes.Add(codeAttrDecl);

        // Create a C# code provider
        CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");

        // Generate code and send the output to the console
        provider.GenerateCodeFromType(class1, Console.Out, new CodeGeneratorOptions());
    }
}

// The C# code generator produces the following source code for the preceeding example code:
//
// [System.Serializable()]
// [System.Obsolete("This class is obsolete.")]
// public class Class1 {
// }

Imports System.CodeDom
Imports System.CodeDom.Compiler

Public Class CodeGenExample

    Shared Sub Main
        ' Declare a new type called Class1.
        Dim class1 as New CodeTypeDeclaration("Class1")

        ' Use attributes to mark the class as serializable and obsolete.
        Dim codeAttrDecl As New CodeAttributeDeclaration("System.Serializable")
        class1.CustomAttributes.Add(codeAttrDecl)

        Dim codeAttr As _
            New CodeAttributeArgument( new CodePrimitiveExpression("This class is obsolete."))
        codeAttrDecl = New CodeAttributeDeclaration("System.Obsolete", codeAttr)
        class1.CustomAttributes.Add(codeAttrDecl)

        ' Create a Visual Basic code provider
        Dim provider As CodeDomProvider = CodeDomProvider.CreateProvider("VisualBasic")

        ' Generate code and send the output to the console
        provider.GenerateCodeFromType(class1, Console.Out, New CodeGeneratorOptions())
    End Sub

End Class

' The Visual Basic code generator produces the following source code for the preceeding example code:
'
' <System.Serializable(),  _
'  System.Obsolete("This class is obsolete.")>  _
' Public Class Class1
' End Class

Remarks

CodeAttributeArgument can be used to represent either the value for a single argument of an attribute constructor, or a value with which to initialize a property of the attribute.

The Value property indicates the value of the argument. The Name property, when used, indicates the name of a property of the attribute to which to assign the value.

Attribute declarations are frequently initialized with a number of arguments that are passed into the constructor of the attribute at run time. To provide arguments to the constructor for an attribute, add a CodeAttributeArgument for each argument to the Arguments collection of a CodeAttributeDeclaration. Only the Value property of each CodeAttributeArgument needs to be initialized. The order of arguments within the collection must correspond to the order of arguments in the method signature of the constructor for the attribute.

You can also set properties of the attribute that are not available through the constructor by providing a CodeAttributeArgument that indicates the name of the property to set, along with the value to set.

Constructors

CodeAttributeArgument()	Initializes a new instance of the CodeAttributeArgument class.
CodeAttributeArgument(CodeExpression)	Initializes a new instance of the CodeAttributeArgument class using the specified value.
CodeAttributeArgument(String, CodeExpression)	Initializes a new instance of the CodeAttributeArgument class using the specified name and value.

Properties

Name	Gets or sets the name of the attribute.
Value	Gets or sets the value for the attribute argument.

Methods

Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

See also

• CodeAttributeDeclaration
• CodeAttributeArgumentCollection