问将scatterview作为区域与Prism一起使用会抛出异常

EN

<s:ScatterView cal:RegionManager.RegionName="{x:Static common:RegionNames.MainRegion}"></s:ScatterView>

protected virtual IRegion CreateRegion(DependencyObject targetElement, string regionName)
{
    try
    {
        // Build the region
        IRegionAdapter regionAdapter = this.regionAdapterMappings.GetMapping(targetElement.GetType());
        IRegion region = regionAdapter.Initialize(targetElement, regionName);

        return region;
    }
    catch (Exception ex)
    {
        throw new RegionCreationException(string.Format(CultureInfo.CurrentCulture, Resources.RegionCreationException, regionName, ex), ex);
    }
}

protected override void Adapt(IRegion region, ItemsControl regionTarget)
{
    bool itemsSourceIsSet = regionTarget.ItemsSource != null;

    #if !SILVERLIGHT
    itemsSourceIsSet = itemsSourceIsSet || (BindingOperations.GetBinding(regionTarget, ItemsControl.ItemsSourceProperty) != null);
    #endif

    if (itemsSourceIsSet)
    {
        throw new InvalidOperationException(Resources.ItemsControlHasItemsSourceException);
    }

    // If control has child items, move them to the region and then bind control to region. Can't set ItemsSource if child items exist.
    if (regionTarget.Items.Count > 0)
    {
        foreach (object childItem in regionTarget.Items)
        {
            region.Add(childItem);
        }
        // Control must be empty before setting ItemsSource
        regionTarget.Items.Clear();
    }

    regionTarget.ItemsSource = region.Views;
}

internal static bool IsItemsReadOnly(ItemsControl itemsControl)
{
    IList itemsControlItems = GetItemsControlItems(itemsControl);
    if (!itemsControlItems.IsReadOnly)
    {
        return itemsControlItems.IsFixedSize;
    }
    return true;
}