I'm working on WinUI3. An UnhandledException occurs when the code below is executed and CheckBoxes are rendered.

public List<int> Collection { get; set; }

public ViewModelConstructor()
{
    Collection = new();
    for (int i = 0; i < 100; i  )
    {
        Collection.Add(0);
    }
}

<ItemsRepeater ItemsSource="{x:Bind ViewModel.Collection}">
    <DataTemplate x:DataType="x:Int32">
        <StackPanel Orientation="Horizontal">
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
            <CheckBox/>
        </StackPanel>
    </DataTemplate>
</ItemsRepeater>

UnhandledException  = (sender, e) =>
{
    if (global::System.Diagnostics.Debugger.IsAttached) global::System.Diagnostics.Debugger.Break();
};

// e.Message: "Failed to assign to property 'Microsoft.UI.Xaml.Controls.AnimatedIcon.Source'. [Line: 0 Position: 0]"
// e.Exception.Message: "XAML parsing failed."
// typeof(e.Exception): Microsoft.UI.Xaml.Markup.XamlParseException

result

exception

It works normally when modified like the code below.

public ViewModelConstructor()
{
    Collection = new();
    for (int i = 0; i < 30; i  )
    {
        Collection.Add(0);
    }
}

Alternatively, changing CheckBox to Button will work normally.

<ItemsRepeater ItemsSource="{x:Bind ViewModel.Collection}">
    <DataTemplate x:DataType="x:Int32">
        <StackPanel Orientation="Horizontal">
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
            <Button/>
        </StackPanel>
    </DataTemplate>
</ItemsRepeater>

I've tried many things and guessed it, it seems to happen when there are many CheckBoxes.

Is there any issue or solution related to this?

CodePudding user response：

This might be related to this issue, which is supposed to be fixed.

TLTR: This seems to be an issue only for CheckBoxes and there seems to be no workaround for the moment. So, think again if this is what you really need.

I tried a few things and this is what I found (at least in my laptop):

CheckBoxes:

• The max number you can instantiate in the MainWindow. (Haven't tried inPages.):
  • WinAppSDK v1.1: 286 items
  • WinAppSDK v1.2: 563 items
• You get the exception even if you separate the CheckBoxes in different Grids. (Haven't tried different Pages.)

Buttons, ToggleButtons, even Expanders:

• You can instantiate more than 10,000 items without getting the exception.