Add missing WPF memory improvement AppContext switches

[Copilot]

Two AppContext switches from the .NET Framework June 2019 cumulative update were missing from the documentation.

Changes

• Added Switch.MS.Internal.EnableCleanupSchedulingImprovements - controls WPF cleanup scheduling improvements to reduce memory usage
• Added Switch.MS.Internal.EnableWeakEventMemoryImprovements - controls WPF weak event pattern memory improvements to prevent leaks

Both switches are documented as introduced in .NET Framework 4.7.2 and follow the existing table format.

Example Usage

<configuration>
  <runtime>
    <AppContextSwitchOverrides value="Switch.MS.Internal.EnableWeakEventMemoryImprovements=true;Switch.MS.Internal.EnableCleanupSchedulingImprovements=true" />
  </runtime>
</configuration>

Fixes #40651

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Appcontext Switches are missing</issue_title>
<issue_description>### Type of issue

Missing information

Description

The switches from
https://devblogs.microsoft.com/dotnet/net-framework-june-27-2019-cumulative-update-for-windows-10-version-1903/
are not listed here. Please add them.

• Switch.MS.Internal.EnableWeakEventMemoryImprovements
• Switch.MS.Internal.EnableCleanupSchedulingImprovements.

Page URL

https://learn.microsoft.com/en-us/dotnet/framework/configure-apps/file-schema/runtime/appcontextswitchoverrides-element

Content source URL

https://github.com/dotnet/docs/blob/main/docs/framework/configure-apps/file-schema/runtime/appcontextswitchoverrides-element.md

Document Version Independent Id

19747ce7-da26-bf2e-5066-1df11e61b0d0

Platform Id

c592b8c1-2bf3-7caf-02ca-251011a50645

Article author

@gewarren

Metadata

• ID: e59350ee-7837-34f8-b50e-c9c136720155
• PlatformId: c592b8c1-2bf3-7caf-02ca-251011a50645
• Service: dotnet-framework

Related Issues</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Appcontext Switches are missing #49297

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Internal previews

📄 File	🔗 Preview link
docs/framework/configure-apps/file-schema/runtime/appcontextswitchoverrides-element.md	<AppContextSwitchOverrides> element

[Copilot]

Pull Request Overview

This PR adds documentation for two new AppContext switches related to WPF weak-event pattern improvements. The additions document switches that control cleanup scheduling and memory allocation behavior for the weak-event pattern.

• Adds Switch.MS.Internal.EnableCleanupSchedulingImprovements switch documentation.
• Adds Switch.MS.Internal.EnableWeakEventMemoryImprovements switch documentation.

[BillWagner]

This LGTM. Let's