替代if else 或者 Switch 中介者模式

1.新建中介者:

 

 public class OperateAction
        {
            private string _OperateObj;   //操作对象
            public string OperateObj
            {
                get { return _OperateObj; }
                set { _OperateObj = value; }
            }

            public OperateAction(string operate)
            {
                this._OperateObj = operate;
            }
            private Dictionary<string, Action<string>> doMethod = new Dictionary<string, Action<string>>();

           /// <summary>
           /// 添加操作命令
           /// </summary>
           /// <param name="operate">操作命令</param>
           /// <param name="dicActiion">注意这个Action<string> ,方法参数必须有</param>
            public void GatherOperate(string operate, Action<string> dicActiion)
            {
                if (!doMethod.ContainsKey(operate))
                {
                    doMethod.Add(operate, dicActiion);
                }
            }
            /// <summary>
            /// 执行操作
            /// </summary>
            /// <param name="_operate"></param>
            public void ExeceteOperate(string _operate)
            {
                if (doMethod.ContainsKey(_operate))
                    doMethod[OperateObj](_operate);
            }
        }

 2.调用方法

        #region 每个方法
        private void Insert(string operate)
        {
            MessageBox.Show(operate);
        }

        private void Edit(string operate)
        {
            MessageBox.Show(operate);
        }

        private void Update(string operate)
        {
            MessageBox.Show(operate);
        }

        private void Cancel(string operate)
        {
            MessageBox.Show(operate);
        }

        private void Delete(string operate)
        {
            MessageBox.Show(operate);
        } 
        #endregion


        private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            string comtext = comboBox1.Text.Trim(); //命令
            OperateAction OP = new OperateAction(comtext);
            OP.GatherOperate(comtext, Insert);
            OP.GatherOperate(comtext, Edit);
            OP.GatherOperate(comtext, Update);
            OP.GatherOperate(comtext, Cancel);
            OP.GatherOperate(comtext, Delete);
            OP.ExeceteOperate(comtext);    //执行
        }