43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
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## Support special relative URI notation when Unicode is present
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### Scope
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Edge
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### Version Introduced
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4.7.2
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### Source Analyzer Status
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NotPlanned
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### Change Description
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<xref:System.Uri> will no longer throw a <xref:System.NullReferenceException> when calling <xref:System.Uri.TryCreate%2A> on certain relative URIs containing Unicode.
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The simplest reproduction of the <xref:System.NullReferenceException> is below, with the two statements being equivalent:
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```csharp
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bool success = Uri.TryCreate("http:%C3%A8", UriKind.RelativeOrAbsolute, out Uri href);
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bool success = Uri.TryCreate("http:è", UriKind.RelativeOrAbsolute, out Uri href);
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```
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To reproduce the <xref:System.NullReferenceException>, the following items must be true:
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- The URI must be specified as relative by prepending it with ‘http:’ and not following it with ‘//’.
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- The URI must contain percent-encoded Unicode or unreserved symbols.
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- [ ] Quirked
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- [ ] Build-time break
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### Recommended Action
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Users depending on this behavior to disallow relative URIs should instead specify <xref:System.UriKind.Absolute?displayProperty=nameWithType> when creating a URI.
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### Affected APIs
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* `M:System.Uri.TryCreate(System.Uri,System.Uri,System.Uri@)`
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* `M:System.Uri.TryCreate(System.String,System.UriKind,System.Uri@)`
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* `M:System.Uri.TryCreate(System.Uri,System.String,System.Uri@)`
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### Category
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Core
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<!--
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### Original Bug
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https://devdiv.visualstudio.com/DevDiv/_workitems/edit/287019
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-->
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