C# 利用委托和事件 传入一个参数进行进行计算并返回结果

一、委托定义

   public class TestData
    {
        //定义委托
        public delegate void Get_TestDataEventHandler(Get_TestDataEventArgs e);
        //定义事件
        public event Get_TestDataEventHandler Get_TestData;
        //定义数据类型 传递和获取 Observer所感兴趣的信息
        //继承EventArgs类
        public class Get_TestDataEventArgs : EventArgs
        {
            //传递两个参数 strWhere strIN
            //获取一个数据 dataset 类型  执行查询后返回的数据集
            public readonly string strWhere,strIN;
            private DataSet ds;

            /// <summary>
           /// 参数类型初始化
           /// </summary>
           /// <param name="strWhere">数据库查询语句 ＷＨＥＲＥ　</param>
           /// <param name="strIN">数据库查询语句　ＩＮ　</param>
            public Get_TestDataEventArgs(string strWhere,string strIN)
            {
                this.strWhere = strWhere;
                this.strIN = strIN;
            }
            // 设置方法执行完毕后的Dataset类型的数据
            public DataSet Data
            {
                set { ds = value; }
                get { return ds; }
            }
        }
        private DataSet _testdata;

        /// <summary>
        /// 返回数据 DataSet
        /// </summary>
        public DataSet Testdata
        {
            get { return _testdata; }
        }

       //判断事件是否有赋值
        protected virtual void onGet_TestData(Get_TestDataEventArgs e)
        {
            if (Get_TestData != null)
            {
                Get_TestData(e);
                _testdata = e.Data;
            }
        }
        /// <summary>
        /// 开始获取数据
        /// </summary>
        /// <param name="e"></param>
        public void Start(Get_TestDataEventArgs e)
        {
            onGet_TestData(e);
        }

    }

二、调用委托方法定义

        /// <summary>
        /// 多芯查询 有IN条件
        /// </summary>
        /// <param name="e"></param>
        public void Getdata_Method_Multicore(TestData.Get_TestDataEventArgs e)
        {
            string sql = "SELECT * ";       
            sql += " WHERE (Name IN ("+e.strIN+"))";
            e.Data =  dbs.Query(sql);
        }

        /// <summary>
        /// 双并查询 有IN条件
        /// </summary>
        /// <param name="e"></param>
        public void Getdata_Method_TwainCore(TestData.Get_TestDataEventArgs e)
        {
            string sql = " SELECT * ";  
            sql += " WHERE "+e.strWhere+" AND (Result LIKE N'%PASS%') AND (Name IN ("+e.strIN+"))";
            e.Data = dbs.Query(sql);
        }

        /// <summary>
        /// 单芯查询 无 IN条件
        /// </summary>
        /// <param name="e"></param>
        public void GetData_Method_OneCore(TestData.Get_TestDataEventArgs e)
        {
            string sql = " SELECT * ";        
            sql += " WHERE " + e.strWhere + " AND (Result LIKE N'%PASS%') ";
            e.Data = dbs.Query(sql);
        }

     三、应用

          TestData _TestData = new TestData(); 

_TestData.Get_TestData += _Method_User_3D.GetData_Method_OneCore;   //3D 数据查询方法设置 

          string strWhere = "Where 语句";                    //Where 语句
          string strIN = "IN 语句";                          //IN    语句 为空                       
          Maticsoft.DAL.TestData.Get_TestDataEventArgs e = new DAL.TestData.Get_TestDataEventArgs(strWhere, strIN);  //委托数据类型初始化                         
         _TestData.Start(e);                                                                                  //开始查询                         
         DataSet ds = _TestData.Testdata;                                                                     //查询到的数据                          
        if (ds.Tables[0].Rows.Count > 0)                                                                      //如果有记录 则表示为良品                      
           {                             
               _result_3D = true;                       
          }                 
       else { _result_3D = false; }