如何在C# UWP的ListView中获取ToggleSwitch实例？

Hey there! Sorry to hear your previous attempt to resolve this didn't work out—misdiagnosing the root cause as a binding issue can definitely throw you off track. Let's tackle this ToggleSwitch-in-ListView problem head-on, since you've already confirmed your jointList data is complete.

Below are the most common non-binding-related issues and their fixes:

1. Fix Toggle State Glitches from ListView Item Reuse #

If your ToggleSwitch states get mixed up when scrolling, this is almost certainly due to ListView's item container reuse mechanism. Here's how to fix it:

• Add a boolean property (like IsToggleActive) to your data model class to store the toggle state for each item. This isn't about XAML binding—it's just a place to persist the state so we can sync it back to the control later.
• Hook up the Toggled event of your ToggleSwitch to save the state to the data item:

private void ToggleSwitch_Toggled(object sender, RoutedEventArgs e)
{
    var toggle = sender as ToggleSwitch;
    var item = toggle.DataContext as YourJointListItemModel;
    
    if (item != null)
    {
        // Save the toggle state directly to the data item
        item.IsToggleActive = toggle.IsChecked.Value;
        // Add your custom business logic here (e.g., update a database, trigger an action)
    }
}

• Use the LoadingRow event to restore the toggle state when an item container is reused:

private void ListView_LoadingRow(object sender, ListViewLoadingRowEventArgs e)
{
    var item = e.Row.DataContext as YourJointListItemModel;
    var toggle = e.Row.FindName("YourToggleSwitchName") as ToggleSwitch;
    
    if (toggle != null && item != null)
    {
        // Sync the saved state back to the ToggleSwitch
        toggle.IsChecked = item.IsToggleActive;
    }
}

2. Ensure ToggleSwitch Events Actually Fire #

Sometimes the ToggleSwitch feels unresponsive because other elements are blocking it or interfering with events:

• Check if your ListViewItem has IsHitTestVisible="False"—this would make the entire item unclickable, including the ToggleSwitch. Set it to True if that's the case.
• If you're using the ListView's ItemClick event, avoid setting e.Handled = true in that handler. Doing so can stop the ToggleSwitch's Toggled event from bubbling up.
• Double-check that the ToggleSwitch's IsEnabled property isn't being set to False somewhere in your code or XAML.

3. Manual State Control for Bulk Operations #

If you need to do things like select/deselect all toggles, make sure you're updating the data model directly instead of trying to manipulate the controls:

// Example: Select all toggles
foreach (var jointItem in jointList)
{
    jointItem.IsToggleActive = true;
}
// Refresh the ListView to sync the updated state to the UI
yourListView.Items.Refresh();

This approach avoids issues with control reuse because we're working with the source data, not the UI elements themselves.

内容的提问来源于stack exchange，提问作者positive perspective