Contract.Requires Method (Boolean, String)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Specifies a precondition contract for the enclosing method or property, and displays a message if the condition for the contract fails.
Assembly: mscorlib (in mscorlib.dll)
[ConditionalAttribute("CONTRACTS_FULL")] public static void Requires( bool condition, string userMessage )
Parameters
- condition
- Type: System.Boolean
The conditional expression to test.
- userMessage
- Type: System.String
The 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.
Use this method instead of the Contract.Requires<TException>(Boolean, String) method when backward compatibility does not force you to throw a particular exception.