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DesignerAttribute Class

Specifies the class used to implement design-time services for a component.

Namespace:  System.ComponentModel
Assembly:  System (in System.dll)

[AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Interface, AllowMultiple = true, 
	Inherited = true)]
public sealed class DesignerAttribute : Attribute

The class you use for the design-time services must implement the IDesigner interface.

Use the DesignerBaseTypeName property to find the designer's base type. Use the DesignerTypeName property to get the name of the type of designer associated with this member.

For more information, see Attributes Overview and Extending Metadata Using Attributes.

The following example creates a class called MyForm. MyForm has two attributes, a DesignerAttribute that specifies this class uses the DocumentDesigner, and a DesignerCategoryAttribute that specifies the Form category.

[Designer("System.Windows.Forms.Design.DocumentDesigner, System.Windows.Forms.Design.DLL", 
public class MyForm : ContainerControl {
    // Insert code here.

The next example creates an instance of MyForm. Then it gets the attributes for the class, extracts the DesignerAttribute, and prints the name of the designer.

public static int Main() {
    // Creates a new form.
    MyForm myNewForm = new MyForm();

    // Gets the attributes for the collection.
    AttributeCollection attributes = TypeDescriptor.GetAttributes(myNewForm);

    /* Prints the name of the designer by retrieving the DesignerAttribute
     * from the AttributeCollection. */
    DesignerAttribute myAttribute = 
    Console.WriteLine("The designer for this class is: " + myAttribute.DesignerTypeName);

    return 0;


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0