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workflow-designer-accessibility-4-8.md

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Accessibility improvements in Windows Workflow Foundation (WF) workflow designer

Scope

Minor

Version Introduced

4.8

Source Analyzer Status

NotPlanned

Change Description

The Windows Workflow Foundation (WF) workflow designer is improving how it works with accessibility technologies. These improvements include the following changes:

  • Users using Narrator will see improvements in FlowSwitch case labels.

  • Users who choose High Contrast themes will see many improvements in the visibility of the Workflow Designer and its controls, like better contrast ratios between elements and more noticeable selection boxes used for focus elements.

  • Users using Narrator will see improvements in button descriptions.

  • Quirked

  • Build-time break

Recommended Action

If you have an application with a re-hosted workflow designer, your application can benefit from these changes by performing either of these actions:

  • Recompile your application to target the .NET Framework 4.8 or later. These accessibility changes are enabled by default.
  • If your application targets the .NET Framework 4.7.2 or earlier but is running on the .NET Framework 4.8 or later, you can opt out of these legacy accessibility behaviors by adding the following AppContext switch to the <runtime> section of the app.config file and set it to false, as the following example shows.
    <?xml version="1.0" encoding="utf-8"?>
    <configuration>
      <startup>
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7"/>
      </startup>
      <runtime>
        <!-- AppContextSwitchOverrides value attribute is in the form of 'key1=true|false;key2=true|false  -->
        <AppContextSwitchOverrides value="Switch.UseLegacyAccessibilityFeatures.3=false" />
      </runtime>
    </configuration>

Applications that target the .NET Framework 4.8 and want to preserve the legacy accessibility behavior can opt in to the use of legacy accessibility features by explicitly setting this AppContext switch to true.

Affected APIs

  • Not detectable via API analysis

Category

Windows Workflow Foundation (WF)