Assert.IsNull Method (Object, String, array<Object )

Verifies that the specified object is nulla null reference (Nothing in Visual Basic). The assertion fails if it is not nulla null reference (Nothing in Visual Basic). Displays a message if the assertion fails, and applies the specified formatting to it.

Namespace:  Microsoft.VisualStudio.TestTools.UnitTesting
Assembly:  Microsoft.VisualStudio.QualityTools.UnitTestFramework (in Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll)

Syntax

'Declaration
Public Shared Sub IsNull ( _
    value As Object, _
    message As String, _
    ParamArray parameters As Object() _
)

public static void IsNull(
    Object value,
    string message,
    params Object[] parameters
)

public:
static void IsNull(
    Object^ value, 
    String^ message, 
    ... array<Object^>^ parameters
)

static member IsNull : 
        value:Object * 
        message:string * 
        parameters:Object[] -> unit

public static function IsNull(
    value : Object, 
    message : String, 
    ... parameters : Object[]
)

Parameters

• value
  Type: Object

  The object to verify is nulla null reference (Nothing in Visual Basic).

• message
  Type: String

  A message to display if the assertion fails. This message can be seen in the unit test results.

• parameters
  Type: array<Object[]

  An array of parameters to use when formatting message.

Exceptions

Exception	Condition
AssertFailedException	value is not nulla null reference (Nothing in Visual Basic).

.NET Framework Security

• Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.

See Also

Reference

Assert Class

IsNull Overload

Microsoft.VisualStudio.TestTools.UnitTesting Namespace

Other Resources

Using the Assert Classes