Expression.TryCatchFinally(Expression, Expression, CatchBlock[]) 메서드

정의

네임스페이스:

System.Linq.Expressions

어셈블리:

System.Linq.Expressions.dll

Source:

TryExpression.cs

원하는 수의 catch 문과 finally 블록 하나를 사용하여 try 블록을 나타내는 TryExpression을 만듭니다.

public:
 static System::Linq::Expressions::TryExpression ^ TryCatchFinally(System::Linq::Expressions::Expression ^ body, System::Linq::Expressions::Expression ^ finally, ... cli::array <System::Linq::Expressions::CatchBlock ^> ^ handlers);

public static System.Linq.Expressions.TryExpression TryCatchFinally (System.Linq.Expressions.Expression body, System.Linq.Expressions.Expression? finally, params System.Linq.Expressions.CatchBlock[]? handlers);

static member TryCatchFinally : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression * System.Linq.Expressions.CatchBlock[] -> System.Linq.Expressions.TryExpression

Public Shared Function TryCatchFinally (body As Expression, finally As Expression, ParamArray handlers As CatchBlock()) As TryExpression

매개 변수

body

Expression

try 블록의 본문입니다.

finally

Expression

finally 블록의 본문입니다.

handlers

CatchBlock[]

try 블록과 연결되는 catch 문을 나타내는 CatchBlock 식을 0개 이상 포함하는 배열입니다.

반환

TryExpression

만든 TryExpression입니다.

예제

다음 예제에서는 catch 문과 finally 문을 포함하는 개체를 만드는 TryExpression 방법을 보여 줍니다.

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

// A TryExpression object that has a catch statement and a finally statement.
// The return types of the try block and all catch blocks must be the same.
TryExpression tryCatchExpr =
    Expression.TryCatchFinally(
        Expression.Block(
            Expression.Throw(Expression.Constant(new DivideByZeroException())),
            Expression.Constant("Try block")
        ),
        Expression.Call(typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }), Expression.Constant("Finally 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:
//
// Finally block
// Catch block

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

' A TryExpression object that has a catch statement and a finally statement.
' The return types of the try block and all catch blocks must be the same.
Dim tryCatchExpr As TryExpression =
    Expression.TryCatchFinally(
        Expression.Block(
            Expression.Throw(Expression.Constant(New DivideByZeroException())),
            Expression.Constant("Try block")
         ),
    Expression.Call(
        GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}),
        Expression.Constant("Finally 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:
'
' Finally block
' Catch block