Assert.IsInstanceOfType Method (Object, Type, String)

Verifies that the specified object is an instance of the specified type. The assertion fails if the type is not found in the inheritance hierarchy of the object. Displays a message if the assertion fails.

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


Public Shared Sub IsInstanceOfType ( _
    value As Object, _
    expectedType As Type, _
    message As String _
public static void IsInstanceOfType(
    Object value,
    Type expectedType,
    string message
static void IsInstanceOfType(
    Object^ value, 
    Type^ expectedType, 
    String^ message
static member IsInstanceOfType : 
        value:Object * 
        expectedType:Type * 
        message:string -> unit
public static function IsInstanceOfType(
    value : Object, 
    expectedType : Type, 
    message : String


  • value
    Type: Object

    The object to verify is of expectedType.

  • expectedType
    Type: Type

    The type expected to be found in the inheritance hierarchy of value.

  • message
    Type: String

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


Exception Condition

value is nulla null reference (Nothing in Visual Basic) or expectedType is not found in the inheritance hierarchy of value.

.NET Framework Security

See Also


Assert Class

IsInstanceOfType Overload

Microsoft.VisualStudio.TestTools.UnitTesting Namespace

Other Resources

Using the Assert Classes