Contract.EnsuresOnThrow<TException> Method (Boolean, String)
Specifies a postcondition contract and a message to display if the condition is false for the enclosing method or property, based on the provided exception and condition.
Assembly: mscorlib (in mscorlib.dll)
[ConditionalAttribute("CONTRACTS_FULL")] public static void EnsuresOnThrow<TException>( bool condition, string userMessage ) where TException : Exception
The type of exception that invokes the postcondition check.
The condition parameter specifies a postcondition that is expected to be true when the enclosing method or property terminates abnormally and an exception of type TException is thrown. The message parameter specifies a message to display if the condition is false.
This method call must be at the beginning of a method or property, before any other code.
This contract is exposed to clients; therefore, it must only reference members that are at least as visible as the enclosing method.
You must use the binary rewriter for run-time enforcement of this postcondition.
If userMessage is not a constant string literal, the contract may not be understood by tools.
.NET FrameworkSupported in: 4.5, 4
.NET Framework Client ProfileSupported in: 4
Portable Class LibrarySupported in: Portable Class Library
.NET for Windows Store appsSupported in: Windows 8
.NET for Windows Phone appsSupported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
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.