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

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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

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

public static void Requires<TException>(
	bool condition
)
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.

  • 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) method when you want to throw an exception if the precondition fails.

Windows Phone OS

Supported in: 8.1, 8.0

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