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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)

[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.

Silverlight

Supported in: 5, 4

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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