Expression.TryCatchFinally Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Creates a TryExpression representing a try block with any number of catch statements and a finally block.
Assembly: System.Core (in System.Core.dll)
'Declaration Public Shared Function TryCatchFinally ( _ body As Expression, _ finally As Expression, _ ParamArray handlers As CatchBlock() _ ) As TryExpression
Parameters
- body
- Type: System.Linq.Expressions.Expression
The body of the try block.
- finally
- Type: System.Linq.Expressions.Expression
The body of the finally 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 and a finally statement.
' 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.
outputBlock.Text &= Expression.Lambda(Of Func(Of String))(tryCatchExpr).Compile()() & vbCrLf
' This code example produces the following output:
'
' Finally block
' Catch block
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