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IDesignerFilter Interface

  • Reference

Definition

Namespace:
System.ComponentModel.Design
Assembly:
System.ComponentModel.TypeConverter.dll
Assembly:
System.dll
Assembly:
netstandard.dll

Provides an interface that enables a designer to access and filter the dictionaries of a TypeDescriptor that stores the property, attribute, and event descriptors that a component designer can expose to the design-time environment.

public interface class IDesignerFilter
public interface IDesignerFilter
type IDesignerFilter = interface
Public Interface IDesignerFilter
Derived

Examples

The following example demonstrates an override of PreFilterProperties that adds a property of the designer to the Properties window when the designer's control is selected at design time. See the example for the ControlDesigner class for a complete designer example that uses the IDesignerFilter interface.

protected:
   [ReflectionPermission(SecurityAction::Demand, Flags=ReflectionPermissionFlag::MemberAccess)]
   virtual void PreFilterProperties( System::Collections::IDictionary^ properties ) override
   {
      properties->Add( "OutlineColor", TypeDescriptor::CreateProperty( TestControlDesigner::typeid, "OutlineColor", System::Drawing::Color::typeid, nullptr ) );
   }

// Adds a property to this designer's control at design time 
// that indicates the outline color to use. 
// The DesignOnlyAttribute ensures that the OutlineColor
// property is not serialized by the designer.
protected override void PreFilterProperties(System.Collections.IDictionary properties)
{
    PropertyDescriptor pd = TypeDescriptor.CreateProperty(
        typeof(ExampleControlDesigner), 
        "OutlineColor",
        typeof(System.Drawing.Color),
        new Attribute[] { new DesignOnlyAttribute(true) });

    properties.Add("OutlineColor", pd);
}

' Adds a property to this designer's control at design time 
' that indicates the outline color to use.
' The DesignOnlyAttribute ensures that the OutlineColor
' property is not serialized by the designer.
Protected Overrides Sub PreFilterProperties(ByVal properties As System.Collections.IDictionary)
    Dim pd As PropertyDescriptor = TypeDescriptor.CreateProperty( _
    GetType(ExampleControlDesigner), _
    "OutlineColor", _
    GetType(System.Drawing.Color), _
    New Attribute() {New DesignOnlyAttribute(True)})

    properties.Add("OutlineColor", pd)
End Sub

Remarks

IDesignerFilter enables a designer to filter the set of property, attribute, and event descriptors that its associated component exposes through a TypeDescriptor. The methods of this interface whose names begin with Pre are called immediately before the methods whose names begin with Post.

If you want to add attribute, event, or property descriptors, use a PreFilterAttributes, PreFilterEvents, or PreFilterProperties method.

If you want to change or remove attribute, event, or property descriptors, use a PostFilterAttributes, PostFilterEvents, or PostFilterProperties method.

Methods

PostFilterAttributes(IDictionary)

When overridden in a derived class, allows a designer to change or remove items from the set of attributes that it exposes through a TypeDescriptor.
PostFilterEvents(IDictionary)

When overridden in a derived class, allows a designer to change or remove items from the set of events that it exposes through a TypeDescriptor.
PostFilterProperties(IDictionary)

When overridden in a derived class, allows a designer to change or remove items from the set of properties that it exposes through a TypeDescriptor.
PreFilterAttributes(IDictionary)

When overridden in a derived class, allows a designer to add items to the set of attributes that it exposes through a TypeDescriptor.
PreFilterEvents(IDictionary)

When overridden in a derived class, allows a designer to add items to the set of events that it exposes through a TypeDescriptor.
PreFilterProperties(IDictionary)

When overridden in a derived class, allows a designer to add items to the set of properties that it exposes through a TypeDescriptor.

Applies to

See also