MemberInfo.IsDefined Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
When overridden in a derived class, indicates whether one or more attributes of the specified type or of its derived types is applied to this member.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public MustOverride Function IsDefined ( _ attributeType As Type, _ inherit As Boolean _ ) As Boolean
Parameters
- attributeType
- Type: System.Type
The type of custom attribute to search for. The search includes derived types.
- inherit
- Type: System.Boolean
true to search this member's inheritance chain to find the attributes; otherwise, false. This parameter is ignored for properties and events; see Remarks.
Return Value
Type: System.Booleantrue if one or more instances of attributeType or any of its derived types is applied to this member; otherwise, false.
Implements
ICustomAttributeProvider.IsDefined(Type, Boolean)This method ignores the inherit parameter for properties and events. To search the inheritance chain for attributes on properties and events, use the appropriate overloads of the Attribute.IsDefined method.
The following example determines whether the specified attribute is applied to the specified member.
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To run this example, see Building examples that have static TextBlock controls for Windows Phone 8. |
Imports System.Reflection ' Define a custom attribute with one named parameter. <AttributeUsage(AttributeTargets.All)> Public Class MyAttribute Inherits Attribute Private myName As String Public Sub New(ByVal name As String) myName = name End Sub 'New Public ReadOnly Property Name() As String Get Return myName End Get End Property End Class 'MyAttribute ' Define a class that has the custom attribute associated with one of its members. Public Class MyClass1 <MyAttribute("This is an example attribute.")> Public Sub MyMethod(ByVal i As Integer) Return End Sub 'MyMethod End Class 'MyClass1 Public Class Example Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock) Try ' Get the type of MyClass1. Dim myType As Type = GetType(MyClass1) ' Get the members associated with MyClass1. Dim myMembers As MemberInfo() = myType.GetMembers() ' Display the attributes for each of the members of MyClass1. Dim i As Integer For i = 0 To myMembers.Length - 1 ' Display the attribute if it is of type MyAttribute. If myMembers(i).IsDefined(GetType(MyAttribute), False) Then Dim myAttributes As [Object]() = myMembers(i).GetCustomAttributes(GetType(MyAttribute), False) outputBlock.Text += String.Format(ControlChars.Cr + "The attributes of type MyAttribute for the member {0} are: " + ControlChars.Cr, myMembers(i)) & vbCrLf Dim j As Integer For j = 0 To myAttributes.Length - 1 ' Display the value associated with the attribute. outputBlock.Text += String.Format("The value of the attribute is : ""{0}""", CType(myAttributes(j), MyAttribute).Name) & vbCrLf Next j End If Next i Catch e As Exception outputBlock.Text += String.Format("An exception occurred: {0}", e.Message) & vbCrLf End Try End Sub 'Main End Class 'MemberInfo_GetCustomAttributes_IsDefined
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