October 15, 2019-KB4519569 Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10 Version 1809 and Windows Server 2019

ASP.NET

Addresses an issue with ValidationContext.MemberName when using custom DataAnnotation.ValidationAttribute.

WPF¹

Addresses and issue where software rendering fails to draw images whose position and scaling are too large. For example, an Image element with Width=10, sourced to a bitmap with width=500 and positioned 700 pixels from the left edge of the enclosing window, fails to appear because the scaling factor S = 500/10 = 50 and the position X=700 are too large, in the sense that their product S * X = 50 * 700 = 35000 exceeds 2^15 = 32768.

CLR²

Reduces the risk of returning unordered ConstructorInfo's from Type.GetConstructors().

Improved behavior in scenarios where external bugs (such as a double-free) prevent underlying OS threads from starting. The runtime now fails with a diagnostic error rather than hanging waiting for the thread to start. This allows better failure recovery and better diagnostics of the problem that caused the failure.

Addresses and issue with late bound .NET COM calls containing SafeArrays where the SafeArray is not fully initialized.

Winforms

Addresses an issue that prevented navigation to the last item of the dropped-down menu item by single up-arrow key press.

Addresses and issue where the property grid can throw a NullReferenceException when selection changes to null (nothing is selected) in response to value changes