August 30, 2019 — KB4511555 Cumulative Update for .NET Framework 3.5, 4.8 for Windows 10, version 1903

BCL¹

Addresses a crash that occurs after enumerating event logs.

WPF ²

• Addresses a regression caused by the fix for the issue involving bindings with DataContext explicitly on the binding path.

• Addresses a handle leak during creation of a Window in WPF applications that are manifested for Per Monitor DPI V2 Awareness. This leak may cause extranious GC.Collect calls that can affect performance in Window creation scenarios.

• Addresses a crash caused by ArgumentNullException when loading a DataGrid containing a ComboBox while automation is active.  For example, when navigating Visual Studio to the Text Editor\C#\Code Style > Naming page in Tools > Options.

Windows Forms

• Enables the ability to select ComboBox edit field text by using mouse down+move.

• Addresses an issue involving interaction between WPF user control and hosting WinForms app when processing keyboard input.

• Addresses an issue that affects  Narrator/NVDA announcing PropertyGrid ComboBox expanding and collapsing action.

• Addresses an issue that affects rendering ellipses (...) button of PropertyGrid control in HC mode to draw button background and dots as contrasted.

ASP.NET

Addresses System.Web.Caching initialization issue when using ASP.NET cache on computers without IIS.