FieldDirection 列舉
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
定義用於指示參數方向和引數宣告的識別項。
public enum class FieldDirection
public enum FieldDirection
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public enum FieldDirection
type FieldDirection =
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Serializable>]
type FieldDirection =
Public Enum FieldDirection
- 繼承
- 屬性
欄位
In | 0 | 輸入的欄位。 |
Out | 1 | 輸出的欄位。 |
Ref | 2 | 欄位參考。 |
範例
下列範例示範如何使用 FieldDirection 來指出方法宣告中方法參數的欄位方向類型。
// Declares a method.
CodeMemberMethod^ method1 = gcnew CodeMemberMethod;
method1->Name = "TestMethod";
// Declares a string parameter passed by reference.
CodeParameterDeclarationExpression^ param1 = gcnew CodeParameterDeclarationExpression( "System.String","stringParam" );
param1->Direction = FieldDirection::Ref;
method1->Parameters->Add( param1 );
// Declares a Int32 parameter passed by incoming field.
CodeParameterDeclarationExpression^ param2 = gcnew CodeParameterDeclarationExpression( "System.Int32","intParam" );
param2->Direction = FieldDirection::Out;
method1->Parameters->Add( param2 );
// A C# code generator produces the following source code for the preceeding example code:
// private void TestMethod(ref string stringParam, out int intParam) {
// }
// Declares a method.
CodeMemberMethod method1 = new CodeMemberMethod();
method1.Name = "TestMethod";
// Declares a string parameter passed by reference.
CodeParameterDeclarationExpression param1 = new CodeParameterDeclarationExpression("System.String", "stringParam");
param1.Direction = FieldDirection.Ref;
method1.Parameters.Add(param1);
// Declares a Int32 parameter passed by incoming field.
CodeParameterDeclarationExpression param2 = new CodeParameterDeclarationExpression("System.Int32", "intParam");
param2.Direction = FieldDirection.Out;
method1.Parameters.Add(param2);
// A C# code generator produces the following source code for the preceeding example code:
// private void TestMethod(ref string stringParam, out int intParam) {
// }
' Declares a method.
Dim method1 As New CodeMemberMethod()
method1.Name = "TestMethod"
' Declares a string parameter passed by reference.
Dim param1 As New CodeParameterDeclarationExpression("System.String", "stringParam")
param1.Direction = FieldDirection.Ref
method1.Parameters.Add(param1)
' Declares a Int32 parameter passed by incoming field.
Dim param2 As New CodeParameterDeclarationExpression("System.Int32", "intParam")
param2.Direction = FieldDirection.Out
method1.Parameters.Add(param2)
' A Visual Basic code generator produces the following source code for the preceeding example code:
' Private Sub TestMethod(ByRef stringParam As String, ByRef intParam As Integer)
' End Sub
備註
FieldDirection 允許依傳址方式,或使用傳入或傳出參數將自變數傳遞至函式。