DefaultPropertyAttribute Class


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Specifies the default property for a component.

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


public sealed class DefaultPropertyAttribute : Attribute


Initializes a new instance of the DefaultPropertyAttribute class.


Gets the name of the default property for the component this attribute is bound to.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


Returns whether the value of the given object is equal to the current DefaultPropertyAttribute.(Overrides Attribute.Equals(Object).)


Returns the hash code for this instance.(Overrides Attribute.GetHashCode().)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)


Specifies the default value for the DefaultPropertyAttribute, which is null. This static field is read-only.

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


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

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

Use the Name property to get the name of the default property.

For more information, see Extending Metadata Using Attributes.

The following example defines a control named MyControl. The class is marked with a DefaultPropertyAttribute that specifies MyProperty as the default property.

 public class MyControl : Control {

    public int MyProperty {
       get {
          // Insert code here.
          return 0;
       set {
          // Insert code here.

    // Insert any additional code.


The next example creates an instance of MyControl. Then it gets the attributes for the class, extracts the DefaultPropertyAttribute, and prints the name of the default property.

public static int Main() {
    // Creates a new control.
    MyControl myNewControl = new MyControl();

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

    /* Prints the name of the default property by retrieving the 
     * DefaultPropertyAttribute from the AttributeCollection. */
    DefaultPropertyAttribute myAttribute = 
    Console.WriteLine("The default property is: " + myAttribute.Name);

    return 0;

.NET Framework
Available since 1.1
Available since 4.0

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

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