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LoginDesigner.PreFilterProperties(IDictionary) Method

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Definition

Namespace:
System.Web.UI.Design.WebControls
Assembly:
System.Design.dll

Used by the designer to remove properties from or add additional properties to the display in the Properties grid or to shadow properties of the associated control.

protected:
 override void PreFilterProperties(System::Collections::IDictionary ^ properties);
protected override void PreFilterProperties (System.Collections.IDictionary properties);
override this.PreFilterProperties : System.Collections.IDictionary -> unit
Protected Overrides Sub PreFilterProperties (properties As IDictionary)

Parameters

properties
IDictionary

A collection implementing the IDictionary of the added and shadowed properties.

Examples

The following code sample creates a class derived from LoginDesigner, and overrides the PreFilterProperties method to change the Properties grid of a Login control at design time. The example makes the NamingContainer property visible in the Properties grid.

// Shadow the control properties with design-time properties.
protected override void PreFilterProperties(IDictionary properties)
{
    // Call the base method first.
    base.PreFilterProperties(properties);

    // Make the NamingContainer visible in the Properties grid.
    PropertyDescriptor selectProp = 
        (PropertyDescriptor)properties["NamingContainer"];
    properties["NamingContainer"] =
        TypeDescriptor.CreateProperty(selectProp.ComponentType, 
            selectProp, BrowsableAttribute.Yes);
} // PreFilterProperties

' Shadow the control properties with design-time properties.
Protected Overrides Sub PreFilterProperties( _
    ByVal properties As IDictionary)

    ' Call the base method first.
    MyBase.PreFilterProperties(properties)

    ' Make the NamingContainer visible in the Properties grid.
    Dim selectProp As PropertyDescriptor = _
        CType(properties("NamingContainer"), PropertyDescriptor)
    properties("NamingContainer") = _
        TypeDescriptor.CreateProperty(selectProp.ComponentType, _
            selectProp, BrowsableAttribute.Yes)
End Sub

Remarks

Control designers use methods that are derived from the ComponentDesigner.PreFilterProperties method to shadow various control properties with corresponding design-time properties that the designer implements, and to add properties to or remove properties from the Properties grid.

If a LayoutTemplate property has been defined for the Login control, the PreFilterProperties sets the BrowsableAttribute attribute of properties that do not apply when templated to false so those properties do not appear in the Properties grid.

Notes to Inheritors

Override the PreFilterProperties(IDictionary) method to add properties to or change attributes of properties in the design-time property collection. Be sure to call the base method before performing other processing.

Applies to

See also