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CodeDirectionExpression Class

Represents an expression used as a method invoke parameter along with a reference direction indicator.

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

System.Object
   System.CodeDom.CodeObject
      System.CodeDom.CodeExpression
         System.CodeDom.CodeDirectionExpression

[Visual Basic]
<Serializable>
<ClassInterface(ClassInterfaceType.AutoDispatch)>
<ComVisible(True)>
Public Class CodeDirectionExpression
   Inherits CodeExpression
[C#]
[Serializable]
[ClassInterface(ClassInterfaceType.AutoDispatch)]
[ComVisible(true)]
public class CodeDirectionExpression : CodeExpression
[C++]
[Serializable]
[ClassInterface(ClassInterfaceType::AutoDispatch)]
[ComVisible(true)]
public __gc class CodeDirectionExpression : public
   CodeExpression
[JScript]
public
   Serializable
 ClassInterface(ClassInterfaceType.AutoDispatch)
 ComVisible(true)
class CodeDirectionExpression extends CodeExpression

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

CodeDirectionExpression can represent a parameter passed to a method and the reference direction of the parameter.

The Expression property indicates the expression to qualify with a direction. The Direction property indicates the direction of the parameter using one of the FieldDirection enumeration values.

Example

[Visual Basic, C#, C++] The following example demonstrates use of a CodeDirectionExpression to specify a field direction modifier for an expression to pass as a method parameter.

[Visual Basic] 
' Declares a parameter passed by reference using a CodeDirectionExpression.
Dim param1 As New CodeDirectionExpression(FieldDirection.Ref, New CodeFieldReferenceExpression(New CodeThisReferenceExpression(), "TestParameter"))
' Invokes a method on this named TestMethod using the direction expression as a parameter.
Dim methodInvoke1 As New CodeMethodInvokeExpression(New CodeThisReferenceExpression(), "TestMethod", param1)

' A Visual Basic code generator produces the following source code for the preceeding example code:    

'      Me.TestMethod("TestParameter")

[C#] 
// Declares a parameter passed by reference using a CodeDirectionExpression.
CodeDirectionExpression param1 = new CodeDirectionExpression(FieldDirection.Ref, new CodeFieldReferenceExpression( new CodeThisReferenceExpression(), "TestParameter" ));
// Invokes a method on this named TestMethod using the direction expression as a parameter.
CodeMethodInvokeExpression methodInvoke1 = new CodeMethodInvokeExpression(new CodeThisReferenceExpression(), "TestMethod", param1 );

// A C# code generator produces the following source code for the preceeding example code:    

//        this.TestMethod(ref TestParameter);

[C++] 
// Declares a parameter passed by reference using a CodeDirectionExpression.
CodeDirectionExpression* param1[] = {new CodeDirectionExpression(FieldDirection::Ref, new CodeFieldReferenceExpression( new CodeThisReferenceExpression(), S"TestParameter" ))};
// Invokes a method on this named TestMethod using the direction expression as a parameter.
CodeMethodInvokeExpression* methodInvoke1 = new CodeMethodInvokeExpression(new CodeThisReferenceExpression(), S"TestMethod", param1 );

// A C# code generator produces the following source code for the preceeding example code:

//        this.TestMethod(ref TestParameter);

[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

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

CodeDirectionExpression Members | System.CodeDom Namespace

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