Exportar (0) Imprimir
Expandir Tudo
Este artigo foi traduzido por máquina. Coloque o ponteiro do mouse sobre as frases do artigo para ver o texto original. Mais informações.
Tradução
Original

CodeGotoStatement Classe

Representa uma instrução goto.

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

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

CodeGotoStatement can be used to represent a goto statement, which is used in some languages to redirect program flow to a specified label.

The Label property indicates the name of the label at which to continue program execution.

ObservaçãoObservação:

Not all languages support goto statements.Call the Supports method with the GotoStatements flag to determine whether a code generator supports goto statements.

The following example code demonstrates use of a CodeGotoStatement and a CodeLabeledStatement to redirect program flow.

// 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 = 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


Quaisquer membros públicos estático (compartilhados na Visual Basic) desse tipo são Thread seguro. Não há garantia de que qualquer membro de instância seja isento de segmentos.

Contribuições da comunidade

ADICIONAR
Mostrar:
© 2015 Microsoft