TryExpression Class

Represents a try/catch/finally/fault block.

System.Object
  System.Linq.Expressions.Expression
    System.Linq.Expressions.TryExpression

Namespace:  System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)
public sealed class TryExpression : Expression

The TryExpression type exposes the following members.

  NameDescription
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsBodyGets the Expression representing the body of the try block.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsCanReduceIndicates that the node can be reduced to a simpler node. If this returns true, Reduce() can be called to produce the reduced form. (Inherited from Expression.)
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsFaultGets the Expression representing the fault block.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsFinallyGets the Expression representing the finally block.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsHandlersGets the collection of CatchBlock expressions associated with the try block.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsNodeTypeReturns the node type of this Expression. (Overrides Expression.NodeType.)
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsTypeGets the static type of the expression that this Expression represents. (Overrides Expression.Type.)
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  NameDescription
Protected methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAcceptDispatches to the specific visit method for this node type. For example, MethodCallExpression calls the VisitMethodCall. (Inherited from Expression.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsReduceReduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsReduceAndCheckReduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsReduceExtensionsReduces the expression to a known node type (that is not an Extension node) or just returns the expression if it is already a known type. (Inherited from Expression.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToStringReturns a textual representation of the Expression. (Inherited from Expression.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsUpdateCreates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression.
Protected methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsVisitChildrenReduces the node and then calls the visitor delegate on the reduced expression. The method throws an exception if the node is not reducible. (Inherited from Expression.)
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The body block is protected by the try block.

The handlers consist of a set of CatchBlock expressions that can be either catch statements or filters.

The fault block runs if an exception is thrown.

The finally block runs regardless of how control exits the body.

Only one of fault or finally blocks can be supplied.

The return type of the try block must match the return type of any associated catch statements.

The following example demonstrates how to create a TryExpression object that contains a catch statement by using the TryCatch method.

// 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

.NET Framework

Supported in: 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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