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Add missing WPF memory improvement AppContext switches #49535

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gewarren merged 3 commits into from
Nov 4, 2025
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Add missing WPF memory improvement AppContext switches #49535

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Copilot Oct 29, 2025
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Add missing AppContext switches for WPF memory improvements
Copilot Oct 29, 2025
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Update docs/framework/configure-apps/file-schema/runtime/appcontextsw…
gewarren Oct 29, 2025
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2 changes: 2 additions & 0 deletions ...amework/configure-apps/file-schema/runtime/appcontextswitchoverrides-element.md
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Expand Up @@ -61,6 +61,8 @@ Defines one or more switches used by the <xref:System.AppContext> class to provi
| Switch name | Description | Introduced |
|-------------|-------------|------------|
|`Switch.MS.Internal.`<br/>`DoNotApplyLayoutRoundingToMarginsAndBorderThickness`|Controls whether Windows Presentation Foundation uses legacy a algorithm for control layout. For more information, see [Mitigation: WPF Layout](../../../migration-guide/mitigation-wpf-layout.md).|.NET Framework 4.6|
|`Switch.MS.Internal.`<br/>`EnableCleanupSchedulingImprovements`|Controls whether improvements to cleanup scheduling in Windows Presentation Foundation are enabled. When set to `true`, enables improved cleanup scheduling to reduce memory usage and improve performance.|.NET Framework 4.7.2|
|`Switch.MS.Internal.`<br/>`EnableWeakEventMemoryImprovements`|Controls whether memory improvements for weak event patterns in Windows Presentation Foundation are enabled. When set to `true`, enables memory improvements that reduce memory leaks related to weak event listeners.|.NET Framework 4.7.2|
|`Switch.MS.Internal.`<br/>`UseSha1AsDefaultHashAlgorithmForDigitalSignatures`|Controls whether the default algorithm used for signing parts of a package by PackageDigitalSignatureManager is SHA1 or SHA256.<br>Due to collision problems with SHA1, Microsoft recommends SHA256.|.NET Framework 4.7.1|
|`Switch.System.Activities.`<br/>`UseMD5CryptoServiceProviderForWFDebugger`|When set to `false`, allows debugging of XAML-based workflow projects with Visual Studio when FIPS is enabled. Without it, a <xref:System.NullReferenceException> is thrown in calls to methods in the System.Activities assembly.|.NET Framework 4.7|
|`Switch.System.Activities.`<br/>`UseMD5ForWFDebugger`|Controls whether the checksum for a workflow instance in the debugger uses MD5 or SHA1. | .NET Framework 4.7|
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