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windows-forms-icon-tobitmap-method-successfully-converts-icons-with-png-frames.md

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Icon.ToBitmap successfully converts icons with PNG frames into Bitmap objects

Scope

Minor

Version Introduced

4.6

Source Analyzer Status

Investigating

Change Description

Starting with the apps that target the .NET Framework 4.6, the xref:System.Drawing.Icon.ToBitmap%2A?displayProperty=nameWithType method successfully converts icons with PNG frames into Bitmap objects.

In apps that target the .NET Framework 4.5.2 and earlier versions, the xref:System.Drawing.Icon.ToBitmap%2A?displayProperty=nameWithType method throws an xref:System.ArgumentOutOfRangeException exception if the Icon object has PNG frames.

This change affects apps that are recompiled to target the .NET Framework 4.6 and that implement special handling for the xref:System.ArgumentOutOfRangeException that is thrown when an Icon object has PNG frames. When running under the .NET Framework 4.6, the conversion is successful, an xref:System.ArgumentOutOfRangeException is no longer thrown, and therefore the exception handler is no longer invoked.

  • Quirked
  • Build-time break

Recommended Action

If this behavior is undesirable, you can retain the previous behavior by adding the following element to the <runtime> section of your app.config file:

<AppContextSwitchOverrides   
      value="Switch.System.Drawing.DontSupportPngFramesInIcons=true" />

If the app.config file already contains the AppContextSwitchOverrides element, the new value should be merged with the value attribute like this:

<AppContextSwitchOverrides   
      value="Switch.System.Drawing.DontSupportPngFramesInIcons=true;<previous key>=<previous value>" />

Affected APIs

  • M:System.Drawing.Icon.ToBitmap

Category

Windows Forms