Contract.Ensures Method (Boolean, String)
Specifies a postcondition contract for a provided exit condition and a message to display if the condition is false.
Assembly: mscorlib (in mscorlib.dll)
[ConditionalAttribute("CONTRACTS_FULL")] public static void Ensures( bool condition, string userMessage )
The condition parameter specifies a postcondition that is expected to be true when the enclosing method or property returns normally.
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 (available at Code Contracts on the MSDN DevLabs Web site) 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.