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EventHandlerList的public 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);
}
}
浙公网安备 33010602011771号