阻止GridView的RowDataBound事件响应

由于很多页面中有GridView控件,在某些情况下不想让RowDataBound事件进行事件响应,也就是阻止事件响应函数的执行,如果一个页面一个页面地去gridView.RowDataBound-=OnRowDataBound改动起来将非常麻烦。

还好这些页面都是MasterPage的嵌套页面,因此可以在MasterPage的cs文件中用FindControlRecursive找到GridView

        /// <summary>
        /// 相当于FindControl,同时适用于Page和MasterPage
        /// </summary>
        /// <param name="root">开始查找点</param>
        /// <param name="id">要查找的控件ID</param>
        /// <returns></returns>
        public static Control FindControlRecursive(Control root, string id)
        {
            if (root.ID == id)
                return root;

            foreach (Control Ctl in root.Controls)
            {
                Control FoundCtl = FindControlRecursive(Ctl, id);

                if (FoundCtl != null)
                    return FoundCtl;
            }

            return null;
        }

  

 

然后通过反射,找到继承自System.ComponentModel.Component的Events

protected EventHandlerList Events
方法是:
Type t = gridView.GetType();
PropertyInfo piEvents = t.GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);

 

 

要用EventHandlerListpublic void RemoveHandler(object key, Delegate value);删除事件响应,
需要先找到key
FieldInfo fiEventKey = t.GetField("EventRowDataBound", BindingFlags.Static | BindingFlags.NonPublic);

 

取delegates
Delegate d = ehl[fiEventKey.GetValue(null)];

  

最后删除
                    if (d != null)
                    {
                        foreach (Delegate temp in d.GetInvocationList())
                        {
                            ehl.RemoveHandler(fiEventKey.GetValue(null), temp);
                        }
                    }

  

完整的代码如下:
                    // 去掉GridView的RowDataBound事件响应
                    Type t = gridView.GetType();
                    PropertyInfo piEvents = t.GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
                    EventHandlerList ehl = (EventHandlerList)piEvents.GetValue(gridView, null);
                    FieldInfo fiEventKey = t.GetField("EventRowDataBound", BindingFlags.Static | BindingFlags.NonPublic);
                    Delegate d = ehl[fiEventKey.GetValue(null)];
                    if (d != null)
                    {
                        foreach (Delegate temp in d.GetInvocationList())
                        {
                            ehl.RemoveHandler(fiEventKey.GetValue(null), temp);
                        }
                    }

  

posted on 2009-08-14 12:26  honker  阅读(261)  评论(0编辑  收藏  举报