c# 移除类中所有事件的绑定

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

        /// <summary>
        /// 移除所有注册事件
        /// </summary>
        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;

        /// <summary>
        /// 移除所有注册事件
        /// </summary>
        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();
        }