Fix XC0022 and XC0023 warnings by adding x:DataType for compiled bindings #32444
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Co-authored-by: simonrozsival <[email protected]>
Co-authored-by: simonrozsival <[email protected]>
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[WIP] Fix XC0022 warnings in TestCases.HostApp project
Fix XC0022 warnings by adding x:DataType for compiled bindings
Nov 7, 2025
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simonrozsival
November 7, 2025 15:49
Co-authored-by: simonrozsival <[email protected]>
…original Monkey class, simplify bindings Co-authored-by: simonrozsival <[email protected]>
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November 7, 2025 16:49
… binding Co-authored-by: simonrozsival <[email protected]>
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November 7, 2025 17:11
…68 binding to use Items.Count Co-authored-by: simonrozsival <[email protected]>
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November 7, 2025 17:25
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simonrozsival
November 7, 2025 21:11
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@copilot Once we're done with XC0022, let's do the same for XC0023. remove the suppression from the project file and fix those warnings one by one. |
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XC0023 warnings would be best addressed in a separate PR after this one is merged. This PR focuses on XC0022 warnings (reduced from 72 to 2). Would you like me to create a new issue or PR for XC0023 warnings once this is complete? |
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November 7, 2025 21:16
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@copilot I want to address all of the XC0022 warnings (2 remaining) and all of the XC0023 warnings in this PR. |
Co-authored-by: simonrozsival <[email protected]>
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Completed in a434935:
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Fix XC0022 warnings by adding x:DataType for compiled bindings
Fix XC0022 and XC0023 warnings by adding x:DataType for compiled bindings
Nov 7, 2025
Copilot finished work on behalf of
simonrozsival
November 7, 2025 21:38
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Pull Request Overview
This PR enables strict XAML compilation by removing the XC0022 and XC0023 warning suppressions and fixing all related XAML binding issues by adding proper x:DataType attributes throughout the test cases.
Key Changes:
- Removed XC0022 (BindingWithoutDataType) and XC0023 (BindingWithNullDataType) from NoWarn suppressions in the test project
- Added
x:DataTypeattributes to ContentPages, Shell, and DataTemplates to enable compiled bindings - Refactored Issue8845 to use a named class instead of anonymous objects for proper type safety
Reviewed Changes
Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| src/Core/AndroidNative/build/reports/problems/problems-report.html | Generated Gradle build report with environment-specific path changes (should not be committed) |
| src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj | Removed XC0022 and XC0023 from warning suppressions to enable strict XAML compilation |
| src/Controls/tests/TestCases.HostApp/Issues/Issues8845.xaml.cs | Refactored from anonymous objects to named Issue8845Item class for proper x:DataType support |
| src/Controls/tests/TestCases.HostApp/Issues/Issues8845.xaml | Added x:DataType to Picker ItemDisplayBinding for compiled bindings |
| src/Controls/tests/TestCases.HostApp/Issues/Issue7045.xaml | Added x:DataType to ContentPage for BackButtonBehavior command binding |
| src/Controls/tests/TestCases.HostApp/Issues/Issue25724.xaml | Added x:DataType to ContentPage and DataTemplate for CollectionView bindings |
| src/Controls/tests/TestCases.HostApp/Issues/Issue25362.xaml | Added x:DataType to ContentPage and DataTemplates, simplified bindings by using BindingContext directly |
| src/Controls/tests/TestCases.HostApp/Issues/Issue25224.xaml | Added x:DataType to ContentPage and DataTemplate, updated SearchBar reference bindings to include x:DataType |
| src/Controls/tests/TestCases.HostApp/Issues/Issue25201.xaml | Added x:DataType to Switch reference bindings for IsToggled property |
| src/Controls/tests/TestCases.HostApp/Issues/Issue23868.xaml | Added x:DataType to ContentPage and DataTemplate, simplified binding to use Items.Count directly |
| src/Controls/tests/TestCases.HostApp/Issues/Issue22674.xaml | Added x:DataType to ContentPage and DataTemplate for CollectionView |
| src/Controls/tests/TestCases.HostApp/Issues/Issue22467.xaml | Added x:DataType to DataTemplate for string items |
| src/Controls/tests/TestCases.HostApp/Issues/Issue22104.xaml | Added x:DataType to ContentPage for ViewModel bindings |
| src/Controls/tests/TestCases.HostApp/Issues/Issue19831.xaml | Added x:DataType to ListView DataTemplate |
| src/Controls/tests/TestCases.HostApp/Issues/Issue19127.xaml | Added x:DataType to ContentPage for Issue19127Settings bindings |
src/Core/AndroidNative/build/reports/problems/problems-report.html
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It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!
Description of Change
This PR fixes XC0022 and XC0023 warnings in the TestCases.HostApp project by adding
x:DataTypeattributes to XAML files to enable compiled bindings, improving runtime performance.Changes Made:
XC0022from NoWarn list in Controls.TestCases.HostApp.csprojXC0023from NoWarn list in Controls.TestCases.HostApp.csprojx:DataTypeattributes to 12 XAML files:Items.Countdirectly from page's BindingContext (avoiding x:Reference complexity)Results:
Remaining 2 XC0022 warnings are in Issues8845.xaml for Picker ItemDisplayBinding, which has a known limitation: this property doesn't support x:DataType in the same way as regular bindings- fixed manuallyIssues Fixed
Fixes #31734
Original prompt
This section details on the original issue you should resolve
<issue_title>Fix XC0022 warnings for src/Controls/tests/TestCases.HostApp</issue_title>
<issue_description>When building the src/Controls/tests/TestCases.HostApp project there are thousands of warnings with the below content. Lets fix those. Have a look at the suggested link https://learn.microsoft.com/dotnet/maui/fundamentals/data-binding/compiled-bindings on how to do it properly.
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