IsDefined Method

Assembly.IsDefined Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Indicates whether or not a specified attribute has been applied to the assembly.

Namespace:  System.Reflection
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Overridable Function IsDefined ( _
	attributeType As Type, _
	inherit As Boolean _
) As Boolean

Parameters

attributeType
Type: System.Type
The Type of the attribute to be checked for this assembly.
inherit
Type: System.Boolean
This argument is ignored for objects of this type.

Return Value

Type: System.Boolean
true if the attribute has been applied to the assembly; otherwise, false.

Implements

ICustomAttributeProvider.IsDefined(Type, Boolean)

ExceptionCondition
ArgumentNullException

attributeType is Nothing.

ArgumentException

attributeType uses an invalid type.

The following code example applies the AssemblyTitleAttribute attribute to an assembly and then uses IsDefined to indicate whether it was applied. It also tests an attribute that was not applied.


Imports System.Reflection

' Apply an assembly-level attribute.
<Assembly: AssemblyTitleAttribute("My Cool Application")> 

Class Example
    Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
        Dim thisAssembly As [Assembly] = [Assembly].GetExecutingAssembly()
        outputBlock.Text &= _
            String.Format("IsDefined(AssemblyTitleAttribute) = {0}" & vbLf, _
                          thisAssembly.IsDefined(GetType(AssemblyTitleAttribute), False))
        outputBlock.Text &= _
            String.Format("IsDefined(AssemblyCompanyAttribute) = {0}" & vbLf, _
                          thisAssembly.IsDefined(GetType(AssemblyCompanyAttribute), False))
    End Sub 
End Class 

' This example produces output similar to the following:
'
'IsDefined(AssemblyTitleAttribute) = True
'IsDefined(AssemblyCompanyAttribute) = False


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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