.NET Framework March 1, 2019 Cumulative Update for Windows 10 version 1809 and Windows Server 2019

Tara Overfield

Tara

Today, March 1, we released the February 2019 Cumulative Update for Windows 10 version 1809 and Windows Server 2019.

Quality and Reliability

This release contains the following quality and reliability improvements.

CLR

  • Addresses an issue in System.Threading.Timer where a single global queue that was protected by a single process-wide lock causing a issues with scalability where Timers are used frequently on multi-CPU machine. The fix can be opted into with an AppContext switch below. See instructions for enabling the switch. [750048]
    • Switch name: Switch.System.Threading.UseNetCoreTimer
    • Switch value to enable: true
      Don’t rely on applying the setting programmatically – the switch value is read only once per AppDomain at the time when the System.Threading.Timer type is loaded.

SQL

  • Addresses an issue that caused compatibility breaks seen in some System.Data.SqlClient usage scenarios. [721209]

Winforms

  • Addresses an issue in .NET 3.5 Windows Forms applications that may not be able to render the application UI and, instead, render a white screen that contains a red “X” symbol. Additionally, it addresses a double prompt for file save dialogue and folder browser dialogue.” [676441]

WPF

  • Improved the memory allocation and cleanup scheduling behavior of the weak-event pattern. The fix can be opted into with an AppContext switch below. See instructions for enabling the switch. [676441]
    • Switch name: Switch.MS.Internal.EnableWeakEventMemoryImprovements
    • Switch name: Switch.MS.Internal.EnableCleanupSchedulingImprovements
    • Switch value to enable: true

 

Getting the Update

The Preview of Quality Rollup 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 update 1809, the .NET Framework updates are part of the Windows 10 .NET Framework Cumulative Update.

Product VersionCumulative Update KB
Windows 10 1809 (October 2018 Update)Catalog
4486553
.NET Framework 3.5, 4.7.24486553

Previous Monthly Rollups

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

Tara Overfield
Tara Overfield

Software Engineer II , .NET Servicing

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1 comment

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    James G. Baker

    What exactly does the WPF Improved the memory allocation refer to? What versions of the .net framework does this fix? Why is this not just on by default?

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