Expression.Throw Yöntem

Tanım

Ad Alanı:

System.Linq.Expressions

Bütünleştirilmiş Kod:

System.Linq.Expressions.dll

UnaryExpression Bir özel durumun atıldığını temsil eden bir oluşturur.

Aşırı Yüklemeler

Throw(Expression)	UnaryExpression Bir özel durumun atıldığını temsil eden bir oluşturur.
Throw(Expression, Type)	Belirli bir UnaryExpression türe sahip bir özel durumun atıldığını temsil eden bir oluşturur.

Throw(Expression)

Kaynak:

UnaryExpression.cs

UnaryExpression Bir özel durumun atıldığını temsil eden bir oluşturur.

public:
 static System::Linq::Expressions::UnaryExpression ^ Throw(System::Linq::Expressions::Expression ^ value);

public static System.Linq.Expressions.UnaryExpression Throw (System.Linq.Expressions.Expression? value);

static member Throw : System.Linq.Expressions.Expression -> System.Linq.Expressions.UnaryExpression

Public Shared Function Throw (value As Expression) As UnaryExpression

Parametreler

value

Expression

Bir Expression.

Döndürülenler

UnaryExpression

UnaryExpression Özel durumu temsil eden bir.

Örnekler

Aşağıdaki örnekte yöntemini kullanan bir TryExpression nesnenin nasıl oluşturulacağı gösterilmektedir Throw .

// Add the following directive to the file:
// using System.Linq.Expressions;

// A TryExpression object that has a Catch statement.
// The return types of the Try block and all Catch blocks must be the same.
TryExpression tryCatchExpr =
    Expression.TryCatch(
        Expression.Block(
            Expression.Throw(Expression.Constant(new DivideByZeroException())),
            Expression.Constant("Try block")
        ),
        Expression.Catch(
            typeof(DivideByZeroException),
            Expression.Constant("Catch block")
        )
    );

// The following statement first creates an expression tree,
// then compiles it, and then runs it.
// If the exception is caught,
// the result of the TryExpression is the last statement
// of the corresponding Catch statement.
Console.WriteLine(Expression.Lambda<Func<string>>(tryCatchExpr).Compile()());

// This code example produces the following output:
//
// Catch block

' Add the following directive to the file:
' Imports System.Linq.Expressions 

' A TryExpression object that has a Catch statement.
' The return types of the Try block and all Catch blocks must be the same.
Dim tryCatchExpr As TryExpression =
       Expression.TryCatch(
           Expression.Block(
               Expression.Throw(Expression.Constant(New DivideByZeroException())),
               Expression.Constant("Try block")
           ),
           Expression.Catch(
               GetType(DivideByZeroException),
               Expression.Constant("Catch block")
           )
       )

' The following statement first creates an expression tree,
' then compiles it, and then runs it.
' If the exception is caught, 
' the result of the TryExpression is the last statement 
' of the corresponding Catch statement.
Console.WriteLine(Expression.Lambda(Of Func(Of String))(tryCatchExpr).Compile()())

' This code example produces the following output:
'
' Catch block

Throw(Expression, Type)

Kaynak:

UnaryExpression.cs

Belirli bir UnaryExpression türe sahip bir özel durumun atıldığını temsil eden bir oluşturur.

public:
 static System::Linq::Expressions::UnaryExpression ^ Throw(System::Linq::Expressions::Expression ^ value, Type ^ type);

public static System.Linq.Expressions.UnaryExpression Throw (System.Linq.Expressions.Expression? value, Type type);

static member Throw : System.Linq.Expressions.Expression * Type -> System.Linq.Expressions.UnaryExpression

Public Shared Function Throw (value As Expression, type As Type) As UnaryExpression

Parametreler

value

Expression

Bir Expression.

type

Type

İfadenin yenisi Type .

Döndürülenler

UnaryExpression

UnaryExpression Özel durumu temsil eden bir.