This issue has been moved from a ticket on Developer Community.

Version: .NET 4.5 (may be later)

I repeatedly enter and delete characters in a WPF TextBox.
It leaks a little memory.

I checked with CLRProfiler45.
The leaking object is InputScopeAttribute.
I close the window, but the InputScopeAttribute object count does not decrease.

I found the cause on referencesource.
TextStore is not decrementing the reference count of InputScopeAttribute.

https://referencesource.microsoft.com/#PresentationFramework/src/Framework/System/Windows/Documents/TextStore.cs,2698

2700  attrval.val.data1.Value = Marshal.GetIUnknownForObject(obj);
2784  _preparedattributes.Add(attrval);
  

The TextStore gets the reference count of the InputScopeAttribute with Marshal.GetIUnknownForObject.

 785  _preparedattributes.Clear();
2666  _preparedattributes.Clear();
  

But it’s not releasing the reference count with Marshal.Release.

Original Comments

Feedback Bot on 5/17/2023, 02:09 PM:

(private comment, text removed)

Feedback Bot on 9/5/2023, 10:54 AM:

(private comment, text removed)

Original Solutions

(no solutions)