CodeGotoStatement-Klasse

Stellt eine goto-Anweisung dar.

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

Syntax

'Declaration
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
<ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _
Public Class CodeGotoStatement
    Inherits CodeStatement
'Usage
Dim instance As CodeGotoStatement

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)] 
public class CodeGotoStatement : CodeStatement

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType::AutoDispatch)] 
public ref class CodeGotoStatement : public CodeStatement

/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) */ 
public class CodeGotoStatement extends CodeStatement

SerializableAttribute 
ComVisibleAttribute(true) 
ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) 
public class CodeGotoStatement extends CodeStatement

Hinweise

Mit der CodeGotoStatement-Klasse kann eine goto-Anweisung dargestellt werden, die in einigen Sprachen zum Umleiten des Programmablaufs zur angegebenen Sprungmarke verwendet wird.

Die Label-Eigenschaft gibt den Namen der Sprungmarke an, an der die Programmausführung fortgesetzt werden soll.

Hinweis

goto-Anweisungen werden nicht von allen Sprachen unterstützt. Rufen Sie die Supports-Methode mit dem GotoStatements-Flag auf, um zu ermitteln, ob ein Code-Generator goto-Anweisungen unterstützt.

Beispiel

Im folgenden Beispielcode wird veranschaulicht, wie mit CodeGotoStatement und CodeLabeledStatement der Programmablauf umgeleitet wird.

' Declares a type to contain the example code.
Dim type1 As New CodeTypeDeclaration("Type1")
' Declares an entry point method.
Dim entry1 As New CodeEntryPointMethod()
type1.Members.Add(entry1)
' Adds a goto statement to continue program flow at the "JumpToLabel" label.
Dim goto1 As New CodeGotoStatement("JumpToLabel")
entry1.Statements.Add(goto1)
' Invokes Console.WriteLine to print "Test Output", which is skipped by the goto statement.
Dim method1 As New CodeMethodInvokeExpression(New CodeTypeReferenceExpression("System.Console"), "WriteLine", New CodePrimitiveExpression("Test Output."))
entry1.Statements.Add(method1)
' Declares a label named "JumpToLabel" associated with a method to output a test string using Console.WriteLine.
Dim method2 As New CodeMethodInvokeExpression(New CodeTypeReferenceExpression("System.Console"), "WriteLine", New CodePrimitiveExpression("Output from labeled statement."))
Dim label1 As New CodeLabeledStatement("JumpToLabel", New CodeExpressionStatement(method2))
entry1.Statements.Add(label1)

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

'   Public Class Type1
'
'       Public Shared Sub Main()
'           GoTo JumpToLabel
'           System.Console.WriteLine("Test Output")
'           JumpToLabel:
'           System.Console.WriteLine("Output from labeled statement.")
'       End Sub
'   End Class

// Declares a type to contain the example code.
CodeTypeDeclaration type1 = new CodeTypeDeclaration("Type1");            
// Declares an entry point method.
CodeEntryPointMethod entry1 = new CodeEntryPointMethod();                        
type1.Members.Add( entry1 );
// Adds a goto statement to continue program flow at the "JumpToLabel" label.
CodeGotoStatement goto1 = new CodeGotoStatement("JumpToLabel");
entry1.Statements.Add( goto1 );
// Invokes Console.WriteLine to print "Test Output", which is skipped by the goto statement.
CodeMethodInvokeExpression method1 = new CodeMethodInvokeExpression(
    new CodeTypeReferenceExpression("System.Console"), "WriteLine", new CodePrimitiveExpression("Test Output."));
entry1.Statements.Add( method1 );
// Declares a label named "JumpToLabel" associated with a method to output a test string using Console.WriteLine.
CodeMethodInvokeExpression method2 = new CodeMethodInvokeExpression(
    new CodeTypeReferenceExpression("System.Console"), "WriteLine", new CodePrimitiveExpression("Output from labeled statement."));
CodeLabeledStatement label1 = new CodeLabeledStatement("JumpToLabel", new CodeExpressionStatement(method2) );
entry1.Statements.Add( label1 );

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

//    public class Type1 
//    {
//        
//        public static void Main() 
//        {
//            goto JumpToLabel;
//            System.Console.WriteLine("Test Output");
//            JumpToLabel:
//            System.Console.WriteLine("Output from labeled statement.");
//        }
//    }

// Declares a type to contain the example code.
CodeTypeDeclaration^ type1 = gcnew CodeTypeDeclaration( "Type1" );

// Declares an entry point method.
CodeEntryPointMethod^ entry1 = gcnew CodeEntryPointMethod;
type1->Members->Add( entry1 );

// Adds a goto statement to continue program flow at the "JumpToLabel" label.
CodeGotoStatement^ goto1 = gcnew CodeGotoStatement( "JumpToLabel" );
entry1->Statements->Add( goto1 );

// Invokes Console.WriteLine to print "Test Output", which is skipped by the goto statement.
array<CodeExpression^>^temp = {gcnew CodePrimitiveExpression( "Test Output." )};
CodeMethodInvokeExpression^ method1 = gcnew CodeMethodInvokeExpression( gcnew CodeTypeReferenceExpression( "System.Console" ),"WriteLine",temp );
entry1->Statements->Add( method1 );

// Declares a label named "JumpToLabel" associated with a method to output a test string using Console.WriteLine.
array<CodeExpression^>^temp2 = {gcnew CodePrimitiveExpression( "Output from labeled statement." )};
CodeMethodInvokeExpression^ method2 = gcnew CodeMethodInvokeExpression( gcnew CodeTypeReferenceExpression( "System.Console" ),"WriteLine",temp2 );
CodeLabeledStatement^ label1 = gcnew CodeLabeledStatement( "JumpToLabel",gcnew CodeExpressionStatement( method2 ) );
entry1->Statements->Add( label1 );

// A C# code generator produces the following source code for the preceeding example code:
//    public class Type1 
//    {
//        
//        public static void Main() 
//        {
//            goto JumpToLabel;
//            System.Console.WriteLine("Test Output");
//            JumpToLabel:
//            System.Console.WriteLine("Output from labeled statement.");
//        }
//    }

// Declares a type to contain the example code.
CodeTypeDeclaration type1 = new CodeTypeDeclaration("Type1");
// Declares an entry point method.
CodeEntryPointMethod entry1 = new CodeEntryPointMethod();
type1.get_Members().Add(entry1);
// Adds a goto statement to continue program flow at the 
// "JumpToLabel" label.
CodeGotoStatement goto1 = new CodeGotoStatement("JumpToLabel");
entry1.get_Statements().Add(goto1);
// Invokes Console.WriteLine to print "Test Output", which is 
// skipped by the goto statement.
CodeMethodInvokeExpression method1 = new CodeMethodInvokeExpression
    (new CodeTypeReferenceExpression("System.Console"), 
    "WriteLine", new CodePrimitiveExpression[] { new 
    CodePrimitiveExpression("Test Output.") });
entry1.get_Statements().Add(method1);
// Declares a label named "JumpToLabel" associated with a method to
// output a test string using Console.WriteLine.
CodeMethodInvokeExpression method2 = new 
    CodeMethodInvokeExpression(new CodeTypeReferenceExpression(
    "System.Console"), "WriteLine", new CodePrimitiveExpression[] 
    { new CodePrimitiveExpression("Output from labeled statement.") });
CodeLabeledStatement label1 = new CodeLabeledStatement("JumpToLabel", 
    new CodeExpressionStatement(method2));
entry1.get_Statements().Add(label1);
// A VJ# code generator produces the following source code for the 
// preceeding example code:
// public class Type1 
// {
//     public static void main() 
//     {
//         goto JumpToLabel;
//         System.Console.WriteLine("Test Output");
//         JumpToLabel:
//         System.Console.WriteLine("Output from labeled statement.");
//     } //main
// } //Type1

Vererbungshierarchie

System.Object
   System.CodeDom.CodeObject
     System.CodeDom.CodeStatement
      System.CodeDom.CodeGotoStatement

Threadsicherheit

Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.

Plattformen

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

CodeGotoStatement-Member
System.CodeDom-Namespace
CodeLabeledStatement