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.