委托和事件

第一步 （C中）创建

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FinancialMgr.UI
{
    //定义一个委托
    public delegate void SelectChangeEventHandler(object sender, int selectIndex);
    public class SelectChangeEvent
    {
        //定义一个事件
        public event SelectChangeEventHandler AskSelectChangeEvent;
        //触发事件
        public void OnSelectChange(object sender, int selectIndex)
        {
            if (AskSelectChangeEvent != null)
            {
                AskSelectChangeEvent(sender, selectIndex);
            }
        }
    }
}

第二步：（A中）声明、绑定

 //声明一个委托
        SelectChangeEvent FormSelectEvent = new SelectChangeEvent();
//绑定
        FormSelectEvent.AskSelectChangeEvent += ChildFromSelected;

第三步：（B中）触发 方法

ChildFromSelected（）

 FormSelectEvent.OnSelectChange(this, blockIndex)

 第三步：（A中）绑定的方法

  #region 事件：子窗体选中事件
        private Control selectedControl = null;
        private void ChildFromSelected(object sender, int blockIndex)
        {
            try
            {
                selectedControl = (Control)sender;
                foreach (var item in pnlBlock.Controls)
                {
                    ((FrmBlock)item).IsSelected = false;
                }
                ((FrmBlock)selectedControl).IsSelected = true;
            }
            catch (Exception ex)
            {
                this.ShowTopic("选中一条申请记录时出现错误，错误原因：" + ex.Message);
            }
        } 
        #endregion