Expression.TryCatch(Expression, CatchBlock[]) Method
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Creates a TryExpression representing a try block with any number of catch statements and neither a fault nor finally block.
public:
static System::Linq::Expressions::TryExpression ^ TryCatch(System::Linq::Expressions::Expression ^ body, ... cli::array <System::Linq::Expressions::CatchBlock ^> ^ handlers);
public static System.Linq.Expressions.TryExpression TryCatch (System.Linq.Expressions.Expression body, params System.Linq.Expressions.CatchBlock[] handlers);
public static System.Linq.Expressions.TryExpression TryCatch (System.Linq.Expressions.Expression body, params System.Linq.Expressions.CatchBlock[]? handlers);
static member TryCatch : System.Linq.Expressions.Expression * System.Linq.Expressions.CatchBlock[] -> System.Linq.Expressions.TryExpression
Public Shared Function TryCatch (body As Expression, ParamArray handlers As CatchBlock()) As TryExpression
- body
- Expression
The body of the try block.
- handlers
- CatchBlock[]
The array of zero or more CatchBlock expressions representing the catch statements to be associated with the try block.
The created TryExpression.
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
' 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
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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