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Contract.Requires<TException> Method (Boolean, String)

Specifies a precondition contract for the enclosing method or property, and throws an exception with the provided message if the condition for the contract fails.

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

public static void Requires<TException>(
	bool condition,
	string userMessage
)
where TException : Exception

Type Parameters

TException

The exception to throw if the condition is false.

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(Boolean, String) method when you want to throw an exception if the precondition fails.

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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