Contract.Requires Method (Boolean, String)
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)
'Declaration <ConditionalAttribute("CONTRACTS_FULL")> _ Public Shared Sub Requires ( _ condition As Boolean, _ userMessage As String _ )
[ConditionalAttribute("CONTRACTS_FULL")] public static void Requires( bool condition, string userMessage )
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.
Supported in: 5, 4
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.