private static void SetupViewModel(object viewModel, FrameworkElement view, IBusyIndicatorHandler busyIndicatorHandler)
{
if (viewModel is not IBusyIndicatorViewModel busyIndicatorViewModel)
{
return;
}
var type = busyIndicatorViewModel.GetType();
var propertyName = nameof(IBusyIndicatorViewModel.BusyIndicatorHandler);
// Check if the 'BusyIndicatorHandler' property has an accessible setter.
var propertyInfo = type.GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance);
if (propertyInfo?.CanWrite ?? false)
{
propertyInfo.SetValue(viewModel, busyIndicatorHandler);
return;
}
// Since the 'BusyIndicatorHandler' property has no setter, its backing field must be manipulated through reflection.
var fieldInfo = type.GetField($"<{propertyName}>k__BackingField", BindingFlags.Instance | BindingFlags.NonPublic);
if (fieldInfo != null)
{
fieldInfo.SetValue(viewModel, busyIndicatorHandler);
return;
}
Trace.WriteLine($"ERROR: Could not inject a '{nameof(IBusyIndicatorHandler)}' into the view model '{type.Name}' as its '{propertyName}' property either has no setter or its backing field could not be found.");
}
/// <summary>
/// Callback that initializes the <see cref="IBusyIndicatorViewModel.BusyIndicatorHandler"/> property of an <see cref="IBusyIndicatorHandler"/>.
/// </summary>
/// <param name="viewModel"> The view model. </param>
/// <param name="view"> The view as <see cref="FrameworkElement"/>. </param>
/// <param name="busyIndicatorHandler"> An <see cref="IBusyIndicatorHandler"/> instance. This instance should be a different one per viewmodel. </param>
public static void Callback(object viewModel, FrameworkElement view, IBusyIndicatorHandler busyIndicatorHandler)
{
SetupViewModel(viewModel, view, busyIndicatorHandler);
}
