Contract.Requires Method (Boolean, String)
.NET Framework (current version)
Specifies a precondition contract for the enclosing method or property, and displays a message if the condition for the contract fails.
Assembly: mscorlib (in mscorlib.dll)
<ConditionalAttribute("CONTRACTS_FULL")> Public Shared Sub Requires ( condition As Boolean, userMessage As String )
Parameters
- condition
-
Type:
System.Boolean
The conditional expression to test.
- userMessage
-
Type:
System.String
The message to display if the condition is false.
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(Of TException)(Boolean, String) method when backward compatibility does not force you to throw a particular exception.
Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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