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Requires(TException) Method (Boolean)

Contract.Requires<TException> Method (Boolean)

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
Assemblies:   mscorlib (in mscorlib.dll)
  System.Diagnostics.Contracts (in System.Diagnostics.Contracts.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.

Important noteImportant

You must turn on run-time checking to use the Requires method. If run-time checking is turned off, the process will be terminated. To obtain the tools for runtime checking, see Code Contracts on the MSDN DevLabs Web site.

  • 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.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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