Expression.Throw Method (Expression)
.NET Framework (current version)
Creates a UnaryExpression that represents a throwing of an exception.
Assembly: System.Core (in System.Core.dll)
Parameters
- value
-
Type:
System.Linq.Expressions.Expression
An Expression.
Return Value
Type: System.Linq.Expressions.UnaryExpressionA UnaryExpression that represents the exception.
The following example demonstrates how to create a TryExpression object that uses the Throw method.
' 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
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
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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