Expression.TryCatch Method (Expression, CatchBlock[])

 

Creates a TryExpression representing a try block with any number of catch statements and neither a fault nor finally block.

Namespace:   System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

public static TryExpression TryCatch(
	Expression body,
	params CatchBlock[] handlers
)

Parameters

body
Type: System.Linq.Expressions.Expression

The body of the try block.

handlers
Type: System.Linq.Expressions.CatchBlock[]

The array of zero or more CatchBlock expressions representing the catch statements to be associated with the try block.

The following example demonstrates how to create a TryExpression object that contains a catch statement.

// 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

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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