虽然有点晚了，但我使用了这个对我来说非常有效的链接: https://www.codeproject.com/Articles/103542/Removing-Event-Handlers-using-Reflection

这个代码的美妙之处在于它适用于所有人，WFP, Forms, Xamarin Forms。我用它来做沙玛林。请注意，只有当你不拥有这个事件(例如，一个库代码在你不关心的一些事件上崩溃)时，你才需要这种方式使用Reflection。

下面是我稍微修改过的代码:

    static Dictionary<Type, List<FieldInfo>> dicEventFieldInfos = new Dictionary<Type, List<FieldInfo>>();

    static BindingFlags AllBindings
    {
        get { return BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static; }
    }

    static void BuildEventFields(Type t, List<FieldInfo> lst)
    {
        foreach (EventInfo ei in t.GetEvents(AllBindings))
        {
            Type dt = ei.DeclaringType;
            FieldInfo fi = dt.GetField(ei.Name, AllBindings);
            if (fi != null)
                lst.Add(fi);
        }
    }
    static List<FieldInfo> GetTypeEventFields(Type t)
    {
        if (dicEventFieldInfos.ContainsKey(t))
            return dicEventFieldInfos[t];

        List<FieldInfo> lst = new List<FieldInfo>();
        BuildEventFields(t, lst);
        dicEventFieldInfos.Add(t, lst);
        return lst;
    }
    static EventHandlerList GetStaticEventHandlerList(Type t, object obj)
    {
        MethodInfo mi = t.GetMethod("get_Events", AllBindings);
        return (EventHandlerList)mi.Invoke(obj, new object[] { });
    }
    public static void RemoveEventHandler(object obj, string EventName = "")
    {
        if (obj == null)
            return;

        Type t = obj.GetType();
        List<FieldInfo> event_fields = GetTypeEventFields(t);
        EventHandlerList static_event_handlers = null;

        foreach (FieldInfo fi in event_fields)
        {
            if (EventName != "" && string.Compare(EventName, fi.Name, true) != 0)
                continue;
            var eventName = fi.Name;
            // After hours and hours of research and trial and error, it turns out that
            // STATIC Events have to be treated differently from INSTANCE Events...
            if (fi.IsStatic)
            {
                // STATIC EVENT
                if (static_event_handlers == null)
                    static_event_handlers = GetStaticEventHandlerList(t, obj);

                object idx = fi.GetValue(obj);
                Delegate eh = static_event_handlers[idx];
                if (eh == null)
                    continue;

                Delegate[] dels = eh.GetInvocationList();
                if (dels == null)
                    continue;

                EventInfo ei = t.GetEvent(eventName, AllBindings);
                foreach (Delegate del in dels)
                    ei.RemoveEventHandler(obj, del);
            }
            else
            {
                // INSTANCE EVENT
                EventInfo ei = t.GetEvent(eventName, AllBindings);
                if (ei != null)
                {
                    object val = fi.GetValue(obj);
                    Delegate mdel = (val as Delegate);
                    if (mdel != null)
                    {
                        foreach (Delegate del in mdel.GetInvocationList())
                        {
                            ei.RemoveEventHandler(obj, del);
                        }
                    }
                }
            }
        }
    }

示例用法:RemoveEventHandler(obj， "Focused");

有时我们不得不使用第三方控件，我们需要构建这些尴尬的解决方案。基于@Anoop Muraleedharan的答案，我创建了这个具有推理类型和ToolStripItem支持的解决方案

    public static void RemoveItemEvents<T>(this T target, string eventName) 
        where T : ToolStripItem
    {            
        RemoveObjectEvents<T>(target, eventName);
    }

    public static void RemoveControlEvents<T>(this T target, string eventName)
        where T : Control
    {
        RemoveObjectEvents<T>(target, eventName);
    }

    private static void RemoveObjectEvents<T>(T target, string Event) where T : class
    {
        var typeOfT = typeof(T);
        var fieldInfo = typeOfT.BaseType.GetField(
            Event, BindingFlags.Static | BindingFlags.NonPublic);
        var provertyValue = fieldInfo.GetValue(target);
        var propertyInfo = typeOfT.GetProperty(
            "Events", BindingFlags.NonPublic | BindingFlags.Instance);
        var eventHandlerList = (EventHandlerList)propertyInfo.GetValue(target, null);
        eventHandlerList.RemoveHandler(provertyValue, eventHandlerList[provertyValue]);
    }

你可以这样使用它

    var toolStripButton = new ToolStripButton();
    toolStripButton.RemoveItemEvents("EventClick");

    var button = new Button();
    button.RemoveControlEvents("EventClick");

删除按钮的所有处理程序: save.RemoveEvents ();

public static class EventExtension
{
    public static void RemoveEvents<T>(this T target) where T : Control
    {
       var propInfo = typeof(T).GetProperty("Events", BindingFlags.NonPublic | BindingFlags.Instance);
        var list = (EventHandlerList)propInfo.GetValue(target, null);
        list.Dispose();
    }
}

这个页面对我帮助很大。我从这里得到的代码是为了从按钮中删除单击事件。我需要删除双击事件从一些面板和单击事件从一些按钮。所以我做了一个控件扩展，它将删除某个事件的所有事件处理程序。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Reflection;
public static class EventExtension
{
    public static void RemoveEvents<T>(this T target, string eventName) where T:Control
    {
        if (ReferenceEquals(target, null)) throw new NullReferenceException("Argument \"target\" may not be null.");
        FieldInfo fieldInfo = typeof(Control).GetField(eventName, BindingFlags.Static | BindingFlags.NonPublic);
        if (ReferenceEquals(fieldInfo, null)) throw new ArgumentException(
            string.Concat("The control ", typeof(T).Name, " does not have a property with the name \"", eventName, "\""), nameof(eventName));
        object eventInstance = fieldInfo.GetValue(target);
        PropertyInfo propInfo = typeof(T).GetProperty("Events", BindingFlags.NonPublic | BindingFlags.Instance);
        EventHandlerList list = (EventHandlerList)propInfo.GetValue(target, null);
        list.RemoveHandler(eventInstance, list[eventInstance]);
    }
}

现在，这个扩展的用法。 如果需要从按钮中删除单击事件，

Button button = new Button();
button.RemoveEvents(nameof(button.EventClick));

如果需要从面板中删除双击事件，

Panel panel = new Panel();
panel.RemoveEvents(nameof(panel.EventDoubleClick));

我不是c#方面的专家，所以如果有任何错误，请原谅我，并让我知道。

接受的答案不完整。对于声明为{add;删除;}

下面是工作代码:

public static void ClearEventInvocations(this object obj, string eventName)
{
    var fi = obj.GetType().GetEventField(eventName);
    if (fi == null) return;
    fi.SetValue(obj, null);
}

private static FieldInfo GetEventField(this Type type, string eventName)
{
    FieldInfo field = null;
    while (type != null)
    {
        /* Find events defined as field */
        field = type.GetField(eventName, BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic);
        if (field != null && (field.FieldType == typeof(MulticastDelegate) || field.FieldType.IsSubclassOf(typeof(MulticastDelegate))))
            break;

        /* Find events defined as property { add; remove; } */
        field = type.GetField("EVENT_" + eventName.ToUpper(), BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic);
        if (field != null)
            break;
        type = type.BaseType;
    }
    return field;
}

删除不存在的事件处理程序不会造成任何损害。因此，如果您知道可能存在哪些处理程序，您可以简单地删除它们。我刚遇到过类似的情况。这在某些情况下可能会有帮助。

如:

// Add handlers...
if (something)
{
    c.Click += DoesSomething;
}
else
{
    c.Click += DoesSomethingElse;
}

// Remove handlers...
c.Click -= DoesSomething;
c.Click -= DoesSomethingElse;