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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.
  • Important noteImportant

    You must turn on run-time checking to use the Requires<TException>(Boolean, String) 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, String) method when you want to throw an exception if the precondition fails.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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