原文:

单例中为防止多处注册事件引起异步触发时发生报错，网上找了一圈没找到想要的方法。

【异常类型】：ArgumentException

【异常信息】：该委托必须有一个目标(且仅有一个目标)。

结合网上资料整合了个方法

/// 
        /// 移除所有注册事件        /// 
        public void RemoveAllEvent()        {            var newType = this.GetType();            foreach (var item in newType.GetEvents())            {                FieldInfo _Field = newType.GetField(item.Name, BindingFlags.Instance | BindingFlags.NonPublic);                if (_Field != null)                {                    object _FieldValue = _Field.GetValue(this);                    if (_FieldValue != null && _FieldValue is Delegate)                    {                        Delegate _ObjectDelegate = (Delegate)_FieldValue;                        Delegate[] invokeList = _ObjectDelegate.GetInvocationList();                        if (invokeList != null)                        {                            foreach (Delegate del in invokeList)                            {                                item.RemoveEventHandler(this, del);                            }                        }                    }                }            }        }

 

测试：

using System;using System.Reflection;namespace FormTest{    class Class1    {        public event Action OnTest;        public event Action OnShow;        /// 
        /// 移除所有注册事件        /// 
        public void RemoveAllEvent()        {            var newType = this.GetType();            foreach (var item in newType.GetEvents())            {                FieldInfo _Field = newType.GetField(item.Name, BindingFlags.Instance | BindingFlags.NonPublic);                if (_Field != null)                {                    object _FieldValue = _Field.GetValue(this);                    if (_FieldValue != null && _FieldValue is Delegate)                    {                        Delegate _ObjectDelegate = (Delegate)_FieldValue;                        Delegate[] invokeList = _ObjectDelegate.GetInvocationList();                        if (invokeList != null)                        {                            foreach (Delegate del in invokeList)                            {                                item.RemoveEventHandler(this, del);                            }                        }                    }                }            }        }    }}

private void button7_Click(object sender, EventArgs e)        {            Class1 cla = new Class1();            cla.OnShow += cla_OnShow;            cla.OnShow += cla_OnShow;            cla.OnTest += cla_OnTest;            cla.RemoveAllEvent();        }        void cla_OnTest()        {            throw new NotImplementedException();        }        void cla_OnShow()        {            throw new NotImplementedException();        }