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Add .NET 10 Known Configuration Issue #10146

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tarekgh merged 4 commits into from
Nov 4, 2025
Merged

Add .NET 10 Known Configuration Issue #10146

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5281018
Add .Net 10 Known Configuration Issue
tarekgh Nov 3, 2025
b86367b
small tweak
tarekgh Nov 3, 2025
3af6fe3
Update release-notes/10.0/known-issues.md
tarekgh Nov 4, 2025
722ea64
Fix formatting errors
tarekgh Nov 4, 2025
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10 changes: 10 additions & 0 deletions release-notes/10.0/known-issues.md
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Expand Up @@ -70,3 +70,13 @@ Up to 10% startup performance regression was identified in .NET 10 runtime, part
Updating .NET 10 preview7, RC1, or RC2 to RTM may fail to set the `PATH` environment variable on Windows. To work around this issue, repair the .NET 10 Installation. If earlier, non-native versions like 5.0 are present, it can result in swapping the path entries for x86 and x64.

See [the GitHub issue](https://github.com/dotnet/sdk/issues/51218) for more details.

## Configuration regression when binding `IEnumerable<T>` property to empty array

Applications that use an empty array configuration such as `"IEnumerableProperty": []` and bind it to an uninitialized property of type `IEnumerable<T>`, `IReadOnlyList<T>`, or `IReadOnlyCollection<T>` will encounter an `ArgumentNullException`. This exception can cause the application to crash if it isn’t properly handled.

See [the GitHub issue](https://github.com/dotnet/runtime/issues/121193) for more details. This issue will be fixed in a future servicing release for .NET 10.

### Available Workarounds

Using a concrete `T[]` array instead of `IEnumerable<T>` for the configuration property works around this issue.