c# 移除类中所有事件的绑定

Posted 2022-06-19 zszh

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);
                            
                        
                    
                
            
        
    

View Code

        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();
        

View Code