.NET Framework February 2019 Preview of Quality Rollup

Tara Overfield

Tara

Today, we released the February 2019 Preview of Quality Rollup.

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]

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 1607, Windows 10 update 1703, Windows 10 update 1709 and Windows update 1803, the .NET Framework updates are part of the Windows 10 Monthly Rollup.

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

Product VersionCumulative Update KB
Windows 10 1803 (April 2018 Update)Catalog
4487029
.NET Framework 3.5, 4.7.24487029
Windows 10 1709 (Fall Creators Update)Catalog
4487021
.NET Framework 3.5, 4.7.1, 4.7.24487021
Windows 10 1703 (Creators Update)Catalog
4487011
.NET Framework 3.5, 4.7, 4.7.1, 4.7.24487011
Windows 10 1607 (Anniversary Update)Catalog
Windows Server 20164487006
.NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.24487006

The following table is for earlier Windows and Windows Server versions.

Product VersionPreview of Quality Rollup KB
Windows 8.1
Windows RT 8.1
Windows Server 2012 R2
Catalog
4487258
.NET Framework 3.5Catalog
4483459
.NET Framework 4.5.2Catalog
4483453
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2Catalog
4486545
Windows Server 2012Catalog
4487257
.NET Framework 3.5Catalog
4483456
.NET Framework 4.5.2Catalog
4483454
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2Catalog
4486544
Windows 7 SP1
Windows Server 2008 R2 SP1
Catalog
4487256
.NET Framework 3.5.1Catalog
4483458
.NET Framework 4.5.2Catalog
4483455
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2Catalog
4486546
Windows Server 2008Catalog
4487259
.NET Framework 2.0, 3.0Catalog
4483457
.NET Framework 4.5.2Catalog
4483455
.NET Framework 4.6Catalog
4486546

Previous Monthly Rollups

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

Tara Overfield
Tara Overfield

Software Engineer II , .NET Servicing

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