CodeIterationStatement 类

定义

命名空间:

System.CodeDom

程序集:

System.CodeDom.dll

包:

System.CodeDom v8.0.0

Source:

CodeIterationStatement.cs

表示 for 语句或语句块内的循环（使用测试表达式作为继续循环的条件）。

public ref class CodeIterationStatement : System::CodeDom::CodeStatement

public class CodeIterationStatement : System.CodeDom.CodeStatement

type CodeIterationStatement = class
    inherit CodeStatement

Public Class CodeIterationStatement
Inherits CodeStatement

继承

Object

CodeObject

CodeStatement

CodeIterationStatement

示例

此示例演示如何使用 CodeIterationStatement 表示 for 循环。

// Declares and initializes an integer variable named testInt.
CodeVariableDeclarationStatement^ testInt = gcnew CodeVariableDeclarationStatement( int::typeid,"testInt",gcnew CodePrimitiveExpression( (int^)0 ) );
array<CodeMethodInvokeExpression^>^writelineparams = {gcnew CodeMethodInvokeExpression( gcnew CodeVariableReferenceExpression( "testInt" ),"ToString",nullptr )};
array<CodeStatement^>^codestatements = {gcnew CodeExpressionStatement( gcnew CodeMethodInvokeExpression( gcnew CodeMethodReferenceExpression( gcnew CodeTypeReferenceExpression( "Console" ),"WriteLine" ),writelineparams ) )};

// Creates a for loop that sets testInt to 0 and continues incrementing testInt by 1 each loop until testInt is not less than 10.

// Each loop iteration the value of the integer is output using the Console.WriteLine method.
CodeIterationStatement^ forLoop = gcnew CodeIterationStatement( gcnew CodeAssignStatement( gcnew CodeVariableReferenceExpression( "testInt" ),gcnew CodePrimitiveExpression( 1 ) ),gcnew CodeBinaryOperatorExpression( gcnew CodeVariableReferenceExpression( "testInt" ),CodeBinaryOperatorType::LessThan,gcnew CodePrimitiveExpression( 10 ) ),gcnew CodeAssignStatement( gcnew CodeVariableReferenceExpression( "testInt" ),gcnew CodeBinaryOperatorExpression( gcnew CodeVariableReferenceExpression( "testInt" ),CodeBinaryOperatorType::Add,gcnew CodePrimitiveExpression( 1 ) ) ),codestatements );

// A C# code generator produces the following source code for the preceeding example code:
//     int testInt = 0;
//     for (testInt = 1; (testInt < 10); testInt = (testInt + 1)) {
//        Console.WriteLine(testInt.ToString());

// Declares and initializes an integer variable named testInt.
CodeVariableDeclarationStatement testInt = new CodeVariableDeclarationStatement(typeof(int), "testInt", new CodePrimitiveExpression(0) );

// Creates a for loop that sets testInt to 0 and continues incrementing testInt by 1 each loop until testInt is not less than 10.
CodeIterationStatement forLoop = new CodeIterationStatement(
    // initStatement parameter for pre-loop initialization.
    new CodeAssignStatement( new CodeVariableReferenceExpression("testInt"), new CodePrimitiveExpression(1) ),
    // testExpression parameter to test for continuation condition.
    new CodeBinaryOperatorExpression( new CodeVariableReferenceExpression("testInt"),
        CodeBinaryOperatorType.LessThan, new CodePrimitiveExpression(10) ),
    // incrementStatement parameter indicates statement to execute after each iteration.
    new CodeAssignStatement( new CodeVariableReferenceExpression("testInt"), new CodeBinaryOperatorExpression(
        new CodeVariableReferenceExpression("testInt"), CodeBinaryOperatorType.Add, new CodePrimitiveExpression(1) )),
    // statements parameter contains the statements to execute during each interation of the loop.
    // Each loop iteration the value of the integer is output using the Console.WriteLine method.
    new CodeStatement[] { new CodeExpressionStatement( new CodeMethodInvokeExpression( new CodeMethodReferenceExpression(
        new CodeTypeReferenceExpression("Console"), "WriteLine" ), new CodeMethodInvokeExpression(
        new CodeVariableReferenceExpression("testInt"), "ToString" ) ) ) } );

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

//     int testInt = 0;
//     for (testInt = 1; (testInt < 10); testInt = (testInt + 1)) {
//        Console.WriteLine(testInt.ToString());

 ' Declares and initializes an integer variable named testInt.
 Dim testInt As New CodeVariableDeclarationStatement(GetType(Integer), "testInt", New CodePrimitiveExpression(0))
 
 ' Creates a for loop that sets testInt to 0 and continues incrementing testInt by 1 each loop until testInt is not less than 10.
    ' initStatement parameter for pre-loop initialization.
    ' testExpression parameter indicates the epxression to test for continuation condition.
    ' incrementStatement parameter indicates statement to execute after each iteration.
    ' statements parameter contains the statements to execute during each interation of the loop.
    ' Each loop iteration the value of the integer is output using the Console.WriteLine method.

 Dim forLoop As New CodeIterationStatement( _
    New CodeAssignStatement(New CodeVariableReferenceExpression("testInt"), New CodePrimitiveExpression(1)), _
    New CodeBinaryOperatorExpression(New CodeVariableReferenceExpression("testInt"), _ 
        CodeBinaryOperatorType.LessThan, New CodePrimitiveExpression(10)), _
    New CodeAssignStatement(New CodeVariableReferenceExpression("testInt"), _
    New CodeBinaryOperatorExpression(New CodeVariableReferenceExpression("testInt"), _
        CodeBinaryOperatorType.Add, New CodePrimitiveExpression(1))), _
    New CodeStatement() {New CodeExpressionStatement( _
        New CodeMethodInvokeExpression(New CodeMethodReferenceExpression(New CodeTypeReferenceExpression("Console"), "WriteLine"), _ 
                New CodeMethodInvokeExpression(New CodeVariableReferenceExpression("testInt"), "ToString")))})


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

'     Dim testInt As Integer = 0
'     testInt = 1
'     Do While (testInt < 10)
'         Console.WriteLine(testInt.ToString)
'         testInt = (testInt + 1)

注解

CodeIterationStatement可以表示for循环或while循环。

属性 InitStatement 指定要在第一次循环迭代之前执行的语句。 属性 TestExpression 指定循环延续表达式，该表达式必须在每次循环迭代结束时计算为 true ，以便开始另一个迭代。 属性 IncrementStatement 指定要在每个循环迭代结束时执行的语句。 属性 Statements 指定要在循环中执行的语句的集合。

构造函数

CodeIterationStatement()	初始化 CodeIterationStatement 类的新实例。
CodeIterationStatement(CodeStatement, CodeExpression, CodeStatement, CodeStatement[])	使用指定参数初始化 CodeIterationStatement 类的新实例。

属性

EndDirectives	获取包含结束指令的 CodeDirectiveCollection 对象。 (继承自 CodeStatement)
IncrementStatement	获取或设置在每个循环周期后调用的语句。
InitStatement	获取或设置循环初始化语句。
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)
Statements	获取要在循环内执行的语句的集合。
TestExpression	获取或设置作为循环继续的条件进行测试的表达式。
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)