Expression.TypeIs(Expression, Type) 方法

public:
 static System::Linq::Expressions::TypeBinaryExpression ^ TypeIs(System::Linq::Expressions::Expression ^ expression, Type ^ type);

public static System.Linq.Expressions.TypeBinaryExpression TypeIs(System.Linq.Expressions.Expression expression, Type type);

static member TypeIs : System.Linq.Expressions.Expression * Type -> System.Linq.Expressions.TypeBinaryExpression

Public Shared Function TypeIs (expression As Expression, type As Type) As TypeBinaryExpression

参数

返回

属性等于和属性TypeOperandExpression设置为指定值的 ATypeBinaryExpression。TypeIsNodeType

例外

示例

下面的示例演示如何使用 TypeIs(Expression, Type) 该方法创建一个 TypeBinaryExpression 表示针对该 Int32 类型的字符串值的类型测试。

// Create a TypeBinaryExpression that represents a
// type test of the string "spruce" against the 'int' type.
System.Linq.Expressions.TypeBinaryExpression typeBinaryExpression =
    System.Linq.Expressions.Expression.TypeIs(
        System.Linq.Expressions.Expression.Constant("spruce"),
        typeof(int));

Console.WriteLine(typeBinaryExpression.ToString());

// This code produces the following output:
//
// ("spruce" Is Int32)

' Create a TypeBinaryExpression that represents a
' type test of the String "spruce" against the Int32 type.
Dim typeBinaryExpression As System.Linq.Expressions.TypeBinaryExpression = _
    System.Linq.Expressions.Expression.TypeIs( _
        System.Linq.Expressions.Expression.Constant("spruce"), _
        Type.GetType("System.Int32"))

Console.WriteLine(typeBinaryExpression.ToString())

' This code produces the following output:
'
' ("spruce" Is Int32)

注解

Type结果UnaryExpression表示Boolean的属性。