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.

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.

Community Additions

ADD
Show: