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Contract.Ensures Method (Boolean, String)

Specifies a postcondition contract for a provided exit condition and a message to display if the condition is false.

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

[ConditionalAttribute("CONTRACTS_FULL")]
public static void Ensures(
	bool condition,
	string userMessage
)

Parameters

condition
Type: System.Boolean
The conditional expression to test. The expression may include OldValue<T> and Result<T> values.
userMessage
Type: System.String
The message to display if the expression is not true.

The condition parameter specifies a postcondition that is expected to be true when the enclosing method or property returns normally.

  • 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.

  • You must use the binary rewriter (available at Code Contracts on the MSDN DevLabs Web site) for run-time enforcement of this postcondition.

  • If userMessage is not a constant string literal, the contract may not be understood by tools.

.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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