43 lines
1.5 KiB
Markdown
43 lines
1.5 KiB
Markdown
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## NullReferenceException in exception handling code from ImageSourceConverter.ConvertFrom
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### Scope
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Edge
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### Version Introduced
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4.7
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### Source Analyzer Status
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NotPlanned
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### Change Description
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An error in the exception handling code for ImageSourceConverter.ConvertFrom caused an incorrect NullReferenceException to be thrown instead of the intended exception (e.g. DirectoryNotFoundException , FileNotFoundException), this change corrects that error so that the method now throws the right exception.
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By default all applications targeting .NET Framework 4.6.2 and below will continue to throw NullReferenceException for compatibility, developers targeting .NET Framework 4.7 and above should see the right exceptions.
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// Replace the space with an 'x' if applicable
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- [x] Quirked
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- [ ] Build-time break
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### Recommended Action
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Developers who wish to revert to getting NullReferenceException when targeting .NET Framework 4.7 can add/merge the following to their application's App.config file:
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```xml
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<configuration>
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<runtime>
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<AppContextSwitchOverrides value="Switch.System.Windows.Media.ImageSourceConverter.OverrideExceptionWithNullReferenceException=true"/>
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</runtime>
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</configuration>
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```
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### Affected APIs
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- `M:System.Windows.Media.ImageSourceConverter.ConvertFrom(System.ComponentModel.ITypeDescriptorContext,System.Globalization.CultureInfo,System.Object)`
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### Category
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Windows Presentation Foundation (WPF)
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<!--
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### Original Bug
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223209
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-->
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<!-- breaking change id: 177 -->
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