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

   1:     public class TestData

   2:      {

   3:          //定义委托

   4:          public delegate void Get_TestDataEventHandler(Get_TestDataEventArgs e);

   5:          //定义事件

   6:          public event Get_TestDataEventHandler Get_TestData;

   7:          //定义数据类型 传递和获取 Observer所感兴趣的信息

   8:          //继承EventArgs类     

   9:          public class Get_TestDataEventArgs : EventArgs

  10:          {

  11:              //传递两个参数 strWhere strIN

  12:              //获取一个数据 dataset 类型  执行查询后返回的数据集

  13:              public readonly string strWhere,strIN;

  14:              private DataSet ds;        

  15:             

  16:              /// <summary>

  17:             /// 参数类型初始化

  18:             /// </summary>

  19:             /// <param name="strWhere">数据库查询语句 ＷＨＥＲＥ　</param>

  20:             /// <param name="strIN">数据库查询语句　ＩＮ　</param>

  21:              public Get_TestDataEventArgs(string strWhere,string strIN)

  22:              {

  23:                  this.strWhere = strWhere;

  24:                  this.strIN = strIN;

  25:              }          

  26:              // 设置方法执行完毕后的Dataset类型的数据           

  27:              public DataSet Data

  28:              {

  29:                  set { ds = value; }

  30:                  get { return ds; }

  31:              }

  32:          }

  33:          private DataSet _testdata;

  34:   

  35:          /// <summary>

  36:          /// 返回数据 DataSet

  37:          /// </summary>

  38:          public DataSet Testdata

  39:          {

  40:              get { return _testdata; }

  41:          }

  42:   

  43:         //判断事件是否有赋值 

  44:          protected virtual void onGet_TestData(Get_TestDataEventArgs e)

  45:          {

  46:              if (Get_TestData != null)

  47:              {

  48:                  Get_TestData(e);

  49:                  _testdata = e.Data;

  50:              }

  51:          }

  52:          /// <summary>

  53:          /// 开始获取数据

  54:          /// </summary>

  55:          /// <param name="e"></param>

  56:          public void Start(Get_TestDataEventArgs e)

  57:          {

  58:              onGet_TestData(e);

  59:          }

  60:   

  61:      }

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; }