TreeDataGrid TemplateColumn & ViewLocator issue #18000
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When I double-click and edit the TemplateColumn cell of the TreeDataGrid, I get an error, and later through debugging, I find that it enters the ViewLocator, but the TextColumn does not enter the ViewLocator. |
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Replies: 1 comment 4 replies
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Your viewlocator is a DataTemplate, added somewhere upstream from your TreeDataGrid instance in the logical/view tree? Then possibly that TemplateColumn is searching for a datatemplate, cannot find what it wants and ends up in this viewlocator that passes its 'Match(object? data)'. |
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My ViewLocator was generated by Avalonia's VS wizard and has never been modified.The TreeDataGrid is simply added to the View as normal, just like any other control. |
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That sample may be helpful. Tip If you don't need the shipping ViewLocator you can simply delete the file and remove it from App.DataTemplates. in recent templates you can opt it out even. |
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It's somewhat complicated. Basically Avalonia searches up the tree, all the way to the application level; until it finds a matching template. Generally the view locator is placed on the application level, so if there is no closer matching template the view locator gets used. There is some docs here: https://docs.avaloniaui.net/docs/get-started/wpf/datatemplates |
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@timunie @thevortexcloud Thanks. |
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It's somewhat complicated. Basically Avalonia searches up the tree, all the way to the application level; until it finds a matching template. Generally the view locator is placed on the application level, so if there is no closer matching template the view locator gets used.
There is some docs here:
https://docs.avaloniaui.net/docs/get-started/wpf/datatemplates
https://docs.avaloniaui.net/docs/concepts/templates/data-templates-collection
https://docs.avaloniaui.net/docs/concepts/templates/reusing-data-templates