CodeGotoStatement 类
定义
重要
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表示 goto 语句。
public ref class CodeGotoStatement : System::CodeDom::CodeStatementpublic class CodeGotoStatement : System.CodeDom.CodeStatement[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDispatch)]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class CodeGotoStatement : System.CodeDom.CodeStatementtype CodeGotoStatement = class
inherit CodeStatement[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDispatch)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Serializable>]
type CodeGotoStatement = class
inherit CodeStatementPublic Class CodeGotoStatement
Inherits CodeStatement- 继承
- 属性
示例
以下示例代码演示如何使用 a CodeGotoStatement 和 a CodeLabeledStatement 重定向程序流。
// 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.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.
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
注解
CodeGotoStatement 可用于表示语句 goto ，该语句用于某些语言将程序流重定向到指定的标签。
该 Label 属性指示要继续执行程序时标签的名称。
备注
并非所有语言都支持 goto 语句。 Supports使用GotoStatements标志调用该方法以确定代码生成器是否支持goto语句。
构造函数
| CodeGotoStatement() |
初始化 CodeGotoStatement 类的新实例。 |
| CodeGotoStatement(String) |
使用指定的标签名初始化 CodeGotoStatement 类的新实例。 |
属性
| EndDirectives |
获取包含结束指令的 CodeDirectiveCollection 对象。 (继承自 CodeStatement) |
| Label |
获取或设置程序继续执行处的标签名称。 |
| LinePragma |
获取或设置代码语句所在的行。 (继承自 CodeStatement) |
| StartDirectives |
获取包含开始指令的 CodeDirectiveCollection 对象。 (继承自 CodeStatement) |
| UserData |
获取当前对象的用户可定义数据。 (继承自 CodeObject) |
方法
| Equals(Object) |
确定指定对象是否等于当前对象。 (继承自 Object) |
| GetHashCode() |
作为默认哈希函数。 (继承自 Object) |
| GetType() |
获取当前实例的 Type。 (继承自 Object) |
| MemberwiseClone() |
创建当前 Object 的浅表副本。 (继承自 Object) |
| ToString() |
返回表示当前对象的字符串。 (继承自 Object) |