FieldDirection FieldDirection FieldDirection FieldDirection Enum

Definizione

Definisce gli identificatori utilizzati per indicare la direzione delle dichiarazioni di parametri e argomenti.Defines identifiers used to indicate the direction of parameter and argument declarations.

public enum class FieldDirection
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public enum FieldDirection
type FieldDirection = 
Public Enum FieldDirection
Ereditarietà
FieldDirectionFieldDirectionFieldDirectionFieldDirection
Attributi

Campi

In In In In 0

Campo in ingresso.An incoming field.

Out Out Out Out 1

Campo in uscita.An outgoing field.

Ref Ref Ref Ref 2

Campo per riferimento.A field by reference.

Esempi

Nell'esempio seguente viene illustrato l'utilizzo di FieldDirection per indicare i tipi di campo direzione dei parametri di un metodo in una dichiarazione di metodo.The following example demonstrates use of FieldDirection to indicate the field direction types of the parameters of a method in a method declaration.

// 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 il passaggio di argomenti alle funzioni per riferimento oppure utilizzando i parametri in entrata o in uscita.FieldDirection allows for passing arguments to functions by reference, or using incoming or outgoing parameters.

Si applica a

Vedi anche