Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

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.

Namespace:   System.Diagnostics.Contracts
Assembly:  mscorlib (in mscorlib.dll)

public:
[ConditionalAttribute("CONTRACTS_FULL")]
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 8
.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:
© 2017 Microsoft