.NET Framework January 2022 Cumulative Update Preview

Today, we are releasing the January 2022 Cumulative Update Preview for .NET Framework.

Quality and Reliability

This release contains the following quality and reliability improvements.

CLR¹

• Addresses rare crashes and hangs that can appear in cases where a GC occurs while another thread is in the middle of certain special paths used to invoke shared-generic code from non-shared-generic contexts.

WPF²

• Addresses a hang when scrolling a list control where both these conditions are
  • UseLayoutRounding is enabled, and
  • The item margin is not a multiple of the rounding quantum. (The quantum is a function of the DPI scaling in effect.)
• Addresses an exception “Height must be non-negative” that can occur when adding items or groups to the collection displayed by an ItemsControl.
• Addresses an issue where a shared ContextMenu stops displaying after it fails to display once because its owner was removed from the visual tree.

¹ Common Language Runtime (CLR) ² Windows Presentation Foundation (WPF)

Getting the Update

The Cumulative Update Preview is available via Windows Update, Windows Server Update Services, and Microsoft Update Catalog.

Microsoft Update Catalog

You can get the update via the Microsoft Update Catalog. For Windows 10, NET Framework 4.8 updates are available via Windows Update, Windows Server Update Services, Microsoft Update Catalog. Updates for other versions of .NET Framework are part of the Windows 10 Monthly Cumulative Update.

**Note**: Customers that rely on Windows Update and Windows Server Update Services will automatically receive the .NET Framework version-specific updates. Advanced system administrators can also take use of the below direct Microsoft Update Catalog download links to .NET Framework-specific updates. Before applying these updates, please ensure that you carefully review the .NET Framework version applicability, to ensure that you only install updates on systems where they apply.

The following table is for Windows 10 and Windows Server 2016+ versions.

Previous Monthly Rollups

The last few .NET Framework Monthly updates are listed below for your convenience:

• • .NET Framework January 2021 Cumulative Update
  • .NET Framework November 2021 Cumulative Update
  • .NET Framework October 2021 Security and Quality Rollup