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.
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