Requires Method (Boolean, String)

Contract.Requires Method (Boolean, String)

.NET Framework (current version)
 

Specifies a precondition contract for the enclosing method or property, and displays a message if the condition for the contract fails.

Namespace:   System.Diagnostics.Contracts
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.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
Return to top
Show:
© 2016 Microsoft