如何将事件处理程序委托强制转换为具有不同签名的委托

我正在编写的代码实际上是一种WPF行为，用于从网格控件中获取所选项（众所周知，SelectedItems不是可绑定属性）。事实上，我使用的是Telerik RadGridView，但我希望行为对于SelectionChanged事件来说是通用的。然而不同的控件对SelectionChanged事件处理程序有不同的签名（RadGridView使用Telerik.Windows.controls.SelectionChangeEventArgs，而标准GridView使用System.Windows.controls.SelectionChangedEventArgs）。我们可以确定的一件事是，事件args将从EventArgs派生（事实上，我们可以确定它将从RoutedEventArg派生）。

然而，虽然我可以编写一个以RoutedEventArgs作为第二个参数的通用事件处理程序，并且我可以使用反射来获取SelectionChangedEvent的EventInfo，但如果不使用事件处理程序的精确签名，我就无法将处理程序挂接到事件-在本例中是RadGridView处理程序。

这是我的密码。我已经包含了所有内容，但重要的一点是SelectItemPropertyChanged，它是DependencyObject PropertyChangedCallback，试图将事件处理程序SelectionChangedHandler连接到SelectionChangedPEvent。（SelectionChangedHandler中的代码与问题无关，但我已经将其保留了下来，所以我在做什么很清楚）。

public static class SelectedItemsChangedBehaviour{
public static readonly DependencyProperty SelectItemsProperty =
    DependencyProperty.RegisterAttached("SelectItems", typeof(bool), typeof(SelectedItemsChangedBehaviour),
    new FrameworkPropertyMetadata(false, new PropertyChangedCallback(SelectItemPropertyChanged)));
public static void SetSelectItems(DependencyObject dependencyObject, bool selectItems)
{
    dependencyObject.SetValue(SelectItemsProperty, selectItems);
}
public static bool GetSelectItems(DependencyObject dependencyObject)
{
    return (bool)dependencyObject.GetValue(SelectItemsProperty);
}
private static void SelectItemPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
    // No common base for all classes with SelectionChanged event so use reflection
    EventInfo selectionChangedEventInfo = dependencyObject.GetType().GetEvent("SelectionChanged");
    if (selectionChangedEventInfo == null)
    {
        throw new ArgumentException("Must have a SelectionChanged event.");
    }
    if ((bool)dependencyPropertyChangedEventArgs.OldValue)
    {
        // This is what I want to do, but it throws because the handler signature is wrong
        selectionChangedEventInfo.RemoveEventHandler(dependencyObject, (RoutedEventHandler)SelectionChangedHandler);
        // This works fine because it is of the right type for the RadGridView but is not general
        //selectionChangedEventInfo.RemoveEventHandler(dependencyObject, (EventHandler<Telerik.Windows.Controls.SelectionChangeEventArgs>)SelectionChangedHandler);
    }
    if ((bool)dependencyPropertyChangedEventArgs.NewValue)
    {
        // This is what I want to do, but it throws because the handler signature is wrong
        selectionChangedEventInfo.AddEventHandler(dependencyObject, (RoutedEventHandler)SelectionChangedHandler);
        // This works fine because it is of the right type for the RadGridView but is not general
        //selectionChangedEventInfo.AddEventHandler(dependencyObject, (EventHandler<Telerik.Windows.Controls.SelectionChangeEventArgs>)SelectionChangedHandler);
    }
}
private static void SelectionChangedHandler(object sender, RoutedEventArgs eventArgs)
{
    // No common base for all classes with AddedItems/RemovedItems (eg. System.Windows.Controls.SelectionChangedEventArgs / Telerik.Windows.Controls.SelectionChangeEventArgs
    PropertyInfo addedItemsInfo = eventArgs.GetType().GetProperty("AddedItems");
    PropertyInfo removedItemsInfo = eventArgs.GetType().GetProperty("RemovedItems");
    if (addedItemsInfo == null || removedItemsInfo == null)
    {
        throw new ArgumentException("Must have AddedItems and RemovedItems");
    }
    foreach (object item in (IEnumerable)addedItemsInfo.GetValue(eventArgs, null))
    {
        ((ISelectable)item).IsSelected = true;
    }
    foreach (object item in (IEnumerable)removedItemsInfo.GetValue(eventArgs, null))
    {
        ((ISelectable)item).IsSelected = false;
    }
}

我已经尝试了各种方法来使用反射为处理程序获取正确的签名，从而为正确的类型创建委托，但我就是无法使其工作——AddEventHandler（和RemoveEventHandler）抛出InvalidArgumentException，完整堆栈跟踪如下：

｛"无法将类型为System.Windows.RoutedEventHandler的对象转换为类型为System.EventHandler `1[Telerik.Windows.Controls.SelectionChangeEventArgs]。"｝

在System.RuntimeType.TryChangeType（对象值，活页夹，CultureInfo区域性，布尔需求SpecialCast）

有人能提出建议吗？

using System;
using System.Reflection;
using System.Threading;
namespace App
{
    class Program
    {
        public event EventHandler<ThreadExceptionEventArgs> E;
        static void Main ()
        {
            new Program().Run();
        }
        private void Run ()
        {
            EventInfo e = typeof(Program).GetEvent("E");
            EventHandler untypedHandler = OnE;
            Delegate typedHandler = Delegate.CreateDelegate(e.EventHandlerType,
                untypedHandler.Target, untypedHandler.Method);
            e.AddEventHandler(this, typedHandler);
            E(this, new ThreadExceptionEventArgs(new Exception("Hello world!")));
        }
        private void OnE (object sender, EventArgs args)
        {
            Console.WriteLine(((ThreadExceptionEventArgs)args).Exception.Message);
        }
    }
}