C# MAUI中CollectionView命令传参Debug/Release结果不一致问题

我的目标是将CollectionView选中项的句柄传递给MainPageVM.CVItemButton()方法。Debug模式下传递的句柄不为空且能正常工作，但Release模式下该句柄为Null。

设计此结构的原因是为了将CollectionViewItem与其具体使用场景分离，以便为其单独设置命令。当然也可以不使用SelfHandle，但我不知道如何将项句柄传递给命令，若有更优的传参方式，请告知我。

测试环境：VS 2022、MAUI框架、搭配CommunityToolkit.Mvvm模块

关键代码 #

1. MainPage.xaml（构建CollectionView，传递项句柄到SelfHandle） #

<CollectionView HorizontalOptions="Center"
                ItemsLayout="VerticalGrid"
                ItemsSource="{Binding CVItems}"
                SelectionMode="None">
    <CollectionView.ItemTemplate>
        <DataTemplate>
            <local:CollectionViewItem HorizontalOptions="Center"
                                      Button1Command="{Binding CVItemButtonCommand, Source={RelativeSource AncestorType={x:Type local:MainPageVM}}}"
                                      SelfHandle="{Binding}"
                                      BindingContext="{Binding}" />
        </DataTemplate>
    </CollectionView.ItemTemplate>
</CollectionView>

2. MainPageVM.cs（创建命令与数据） #

public partial class MainPageVM : ObservableObject
{
    public MainPageVM()
    {
        CVItems = new()
        {
            new (){ Value = 1},
        };
    }

    [ObservableProperty] private ObservableCollection<CollectionViewItemModel> _CVItems;
    [ObservableProperty] private string _Result;

    [RelayCommand(CanExecute = nameof(CanCVItemButton))]
    private void CVItemButton(CollectionViewItemModel m)
    {
        Trace.WriteLine($"Parameter shouldn't be NULL, in Debug it's not NULL, but in Release it's NULL");
        Result = ($"CVItemButton() Paramter is NULL => {m == null}");
    }

    private bool CanCVItemButton(CollectionViewItemModel m)
    {
        Trace.WriteLine($"CanCVItemButton() received an NULL parameter => {m == null}");
        return true;
    }
}

3. CollectionViewItem.cs（定义绑定属性） #

public partial class CollectionViewItem : ContentView
{
    public static readonly BindableProperty Button1CommandProperty =
        BindableProperty.Create(nameof(Button1Command), typeof(ICommand), typeof(CollectionViewItem), null, BindingMode.OneWay);
    public ICommand Button1Command
    {
        get => (ICommand)GetValue(Button1CommandProperty);
        set => SetValue(Button1CommandProperty, value);
    }

    public static readonly BindableProperty SelfHandleProperty =
    BindableProperty.Create(nameof(SelfHandle), typeof(CollectionViewItemModel), typeof(CollectionViewItem), null, BindingMode.TwoWay);
    public CollectionViewItemModel SelfHandle
    {
        get => (CollectionViewItemModel)GetValue(SelfHandleProperty);
        set => SetValue(SelfHandleProperty, value);
    }

    public CollectionViewItem()
    {
        InitializeComponent();
    }
}

4. CollectionViewItem.xaml（按钮命令绑定） #

<?xml version="1.0" encoding="utf-8" ?>
<ContentView xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiApp1.CollectionViewItem"
             x:Name="root">
    <HorizontalStackLayout>
        <Button Text="Button"
                Command="{Binding Button1Command, Source={x:Reference root}}"
                CommandParameter="{Binding SelfHandle, Source={x:Reference root}}" />
    </HorizontalStackLayout>
</ContentView>

内容的提问来源于stack exchange，提问作者ss1969