Defines the member of a type that is the default member used by InvokeMember.
Assembly: mscorlib (in mscorlib.dll)
Thetype exposes the following members.
|Equals||Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Returns the hash code for this instance. (Inherited from Attribute.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|IsDefaultAttribute||When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)|
|Match||When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
|_Attribute.GetIDsOfNames||Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)|
|_Attribute.GetTypeInfo||Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)|
|_Attribute.GetTypeInfoCount||Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)|
|_Attribute.Invoke||Provides access to properties and methods exposed by an object. (Inherited from Attribute.)|
A property is imported as an indexer (default indexed property in Visual Basic) if the property has arguments and if the name of the property or one of its accessors matches the name specified by the . If the is not present on the containing type, then the type does not have an indexer. The C# compiler emits the on any type containing an indexer. In C# it is an error to manually attribute a type with the if the type also declares an indexer.
The following example uses the attribute to make the Age property the default member of the MyClass class.
Imports System Imports System.Reflection Imports System.IO Imports Microsoft.VisualBasic <DefaultMemberAttribute("Age")> Public Class [MyClass] Public Sub Name(ByVal s As String) End Sub 'Name Public ReadOnly Property Age() As Integer Get Return 20 End Get End Property Public Shared Sub Main() Try Dim myType As Type = GetType([MyClass]) Dim memberInfoArray As MemberInfo() = myType.GetDefaultMembers() If memberInfoArray.Length > 0 Then Dim memberInfoObj As MemberInfo For Each memberInfoObj In memberInfoArray Console.WriteLine("The default member name is: " + memberInfoObj.ToString()) Next memberInfoObj Else Console.WriteLine("No default members are available.") End If Catch e As InvalidOperationException Console.WriteLine("InvalidOperationException: " + e.Message) Catch e As IOException Console.WriteLine("IOException: " + e.Message) Catch e As Exception Console.WriteLine("Exception: " + e.Message) End Try End Sub 'Main End Class '[MyClass]
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.