[Mono-bugs] [Bug 675439] New: Adding properties to controls by subclassing TypeDescriptionProvider isn't possible

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sun Feb 27 14:49:58 EST 2011



           Summary: Adding properties to controls by subclassing
                    TypeDescriptionProvider isn't possible
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.10.x
          Platform: x86
        OS/Version: Windows 7
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: cvolzke at live.com.au
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

Created an attachment (id=416434)
 --> (http://bugzilla.novell.com/attachment.cgi?id=416434)
Unit test to demonstrate the expected behaviour

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US)
AppleWebKit/532.5 (KHTML, like Gecko) Chrome/ Safari/532.5

As a control author, it is useful to provide new bindable properties at runtime
to existing  or 3rd party controls without subclassing.

TypeDescriptionProvider.AddProvider is a useful way of achieving this which is
not currently implemented correctly in mono.

Reproducible: Always

Steps to Reproduce:
Below is only summary. See the attached test case.
1. Subclass TypeDescriptionProvider and override GetTypeDescriptor.
2. Subclass CustomTypeDescriptor and override GetProperties to return a custom
3. Call TypeDescriptor.GetProperties(object) and examine the properties

Actual Results:  
The overridden TypeDescriptionProvider is not used.

Expected Results:  
The overriden TypeDescriptionProvider should be used, and the custom property
returned from CustomTypeDescriptor.GetProperties() should be returned from

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