Contract.Requires<TException> Method (Boolean, String)
Specifies a precondition contract for the enclosing method or property, and throws an exception with the provided message if the condition for the contract fails.
Assembly: mscorlib (in mscorlib.dll)
public static void Requires<TException>( bool condition, string userMessage ) where TException : Exception
The exception to throw 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.
Use this method instead of the Contract.Requires(Boolean, String) method when you want to throw an exception if the precondition fails.
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