FieldDirection Enumerazione

  • Riferimento

Definizione

Spazio dei nomi:
System.CodeDom
Assembly:
System.CodeDom.dll
Assembly:
System.dll
Pacchetto:
System.CodeDom v6.0.0
Pacchetto:
System.CodeDom v7.0.0
Pacchetto:
System.CodeDom v8.0.0
Pacchetto:
System.CodeDom v9.0.0-preview.2.24128.5
Source:
FieldDirection.cs
Source:
FieldDirection.cs
Source:
FieldDirection.cs

Definisce gli identificatori utilizzati per indicare la direzione delle dichiarazioni di parametri e argomenti.

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
Ereditarietà
Object
ValueType
Enum
FieldDirection
Attributi
ComVisibleAttribute SerializableAttribute

Campi

In 0

Campo in ingresso.
Out 1

Campo in uscita.
Ref 2

Campo per riferimento.

Esempio

Nell'esempio seguente viene illustrato l'uso di FieldDirection per indicare i tipi di direzione del campo dei parametri di un metodo in una dichiarazione di metodo.

// 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

Commenti

FieldDirection consente di passare argomenti a funzioni per riferimento o usando parametri in ingresso o in uscita.

Si applica a

Vedi anche