CodeDirectionExpression Class

.NET Framework (current version)

Other Versions

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

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

Inheritance Hierarchy

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

Syntax

C++

[SerializableAttribute]
[ClassInterfaceAttribute(ClassInterfaceType::AutoDispatch)]
[ComVisibleAttribute(true)]
public ref class CodeDirectionExpression : CodeExpression

Constructors

	Name	Description
	CodeDirectionExpression()	Initializes a new instance of the CodeDirectionExpression class.
	CodeDirectionExpression(FieldDirection, CodeExpression^)	Initializes a new instance of the CodeDirectionExpression class using the specified field direction and expression.

Properties

	Name	Description
	Direction	Gets or sets the field direction for this direction expression.
	Expression	Gets or sets the code expression to represent.
	UserData	Gets the user-definable data for the current object.(Inherited from CodeObject.)

Methods

	Name	Description
	Equals(Object^)	Determines whether the specified object is equal to the current object.(Inherited from Object.)
	Finalize()	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(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.)

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.

Note
CodeDirectionExpression is intended to be used as a method invoke parameter, and should not be used when declaring methods.

Examples

The following example demonstrates use of a CodeDirectionExpression to specify a field direction modifier for an expression to pass as a method parameter.

C++

// Declares a parameter passed by reference using a CodeDirectionExpression.
array<CodeDirectionExpression^>^param1 = {gcnew CodeDirectionExpression( FieldDirection::Ref,gcnew CodeFieldReferenceExpression( gcnew CodeThisReferenceExpression,"TestParameter" ) )};

// Invokes a method on this named TestMethod using the direction expression as a parameter.
CodeMethodInvokeExpression^ methodInvoke1 = gcnew CodeMethodInvokeExpression( gcnew CodeThisReferenceExpression,"TestMethod",param1 );

// A C# code generator produces the following source code for the preceeding example code:
//        this.TestMethod(ref TestParameter);

Version Information

.NET Framework
Available since 1.1

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.