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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.componentmodel.designercategoryattribute below:

DesignerCategoryAttribute Class (System.ComponentModel) | Microsoft Learn

Specifies that the designer for a class belongs to a certain category.

public ref class DesignerCategoryAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)]
public sealed class DesignerCategoryAttribute : Attribute

public sealed class DesignerCategoryAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)>]
type DesignerCategoryAttribute = class
    inherit Attribute

type DesignerCategoryAttribute = class
    inherit Attribute

Public NotInheritable Class DesignerCategoryAttribute
Inherits Attribute

Inheritance

DesignerCategoryAttribute

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",
IRootDesigner::typeid),
DesignerCategory("Form")]
ref class MyForm: public ContainerControl{
   // Insert code here.
};

[Designer("System.Windows.Forms.Design.DocumentDesigner, System.Windows.Forms.Design",
    typeof(IRootDesigner)),
    DesignerCategory("Form")]

public class MyForm : ContainerControl
{
    // Insert code here.
}

<Designer("System.Windows.Forms.Design.DocumentDesigner, System.Windows.Forms.Design", _
    GetType(IRootDesigner)), DesignerCategory("Form")> _
Public Class MyForm
    
    Inherits ContainerControl
    ' Insert code here.
End Class

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

int main()
{
   // Creates a new form.
   MyForm^ myNewForm = gcnew MyForm;

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

   /* Prints the name of the designer by retrieving the 
       * DesignerCategoryAttribute from the AttributeCollection. */
   DesignerCategoryAttribute^ myAttribute = dynamic_cast<DesignerCategoryAttribute^>(attributes[ DesignerCategoryAttribute::typeid ]);
   Console::WriteLine( "The category of the designer for this class is: {0}", myAttribute->Category );
   return 0;
}

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

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

    /* Prints the name of the designer by retrieving the 
     * DesignerCategoryAttribute from the AttributeCollection. */
    DesignerCategoryAttribute myAttribute =
       (DesignerCategoryAttribute)attributes[typeof(DesignerCategoryAttribute)];
    Console.WriteLine("The category of the designer for this class is: " + myAttribute.Category);

    return 0;
}

Public Shared Function Main() As Integer
    ' Creates a new form.
    Dim myNewForm As New MyForm()
    
    ' Gets the attributes for the collection.
    Dim attributes As AttributeCollection = TypeDescriptor.GetAttributes(myNewForm)
    
    ' Prints the name of the designer by retrieving the
    ' DesignerCategoryAttribute from the AttributeCollection. 
    Dim myAttribute As DesignerCategoryAttribute = _
        CType(attributes(GetType(DesignerCategoryAttribute)), DesignerCategoryAttribute)
    Console.WriteLine(("The category of the designer for this class is: " + myAttribute.Category))
    Return 0
End Function 'Main

A visual designer can use a designer category to inform a development environment of the type of designer that will be implemented. If no designer category is provided on a class, a development environment may or may not allow the class to be designed. A category can be created for any name.

When you mark a class with this attribute, it is set to a constant member. When you want to check the value of this attribute in your code, you must specify the constant member. The Description column in the table below lists the constant member that each value is set to.

The DesignerCategoryAttribute class defines the following common categories:

For more information, see Attributes.

Specifies that a component marked with this category use a component designer. This field is read-only.

Specifies that a component marked with this category cannot use a visual designer. This static field is read-only.

Specifies that a component marked with this category use a form designer. This static field is read-only.

Specifies that a component marked with this category use a generic designer. This static field is read-only.

Gets the name of the category.

Gets a unique identifier for this attribute.

Maps a set of names to a corresponding set of dispatch identifiers.

Retrieves the type information for an object, which can be used to get the type information for an interface.

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

Provides access to properties and methods exposed by an object.

• Attribute
• DesignerAttribute

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