获取该发射了AJAX的UpdatePanel内的回发ASP.NET控件 [英] Get ASP.NET control which fired a postback within a AJAX UpdatePanel
问题描述
与此相关的问题：<一href=\"http://stackoverflow.com/questions/3175513/on-postback-how-can-i-check-which-control-cause-postback-in-page-init-event\">On回发，我怎么能检查哪些控制Page_Init事件回发
如果控件被包装在一个ASP.NET AJAX的UpdatePanel，变量控制是空的，因为它具有AJAX回发后不同的ID。
有没有一种解决方案，使该发射的ASP.NET AJAX的UpdatePanel？
公共静态字符串GetPostBackControlName（页页）{
控制控制= NULL; / **
*首先，我们将检查__EVENTTARGET，因为如果回发是由
*由其中所用的_doPostBack功能控制，这将是Request.Form集合中可用。
* /
字符串ctrlname = page.Request.Params [__ EVENTTARGET]; 如果（！String.IsNullOrEmpty（ctrlname））{
控制= page.FindControl（ctrlname）;
}其他{
/ **
*如果__EVENTTARGER为空，控制按钮式和
*需要遍历窗体集合找到它。
* /
控制C = NULL;
字符串ctrlStr = NULL; 的foreach（在page.Request.Form串CTL）{
如果（ctl.EndsWith（.X）|| ctl.EndsWith（.Y））{
/ **
* ImageButtons有自己的身份证一个额外的准物权标识
*鼠标坐标（X和Y）。
* /
ctrlStr = ctl.Substring（0，ctl.Length - 2）;
C = page.FindControl（ctrlStr）;
}其他{
C = page.FindControl（CTL）;
} 如果（c是按钮|| c为的ImageButton）{
控制= C;
打破;
}
}
} 如果（控制！= NULL）{
返回control.ID;
} 返回的String.Empty;
}
请尝试以下方法：
公共字符串GetAsyncPostBackControlID（）
{
字符串smUniqueId = ScriptManager.GetCurrent（页）.UniqueID;
字符串smFieldValue =的Request.Form [smUniqueId] 如果（String.IsNullOrEmpty（smFieldValue）及＆放大器; smFieldValue.Contains（'|'）！）
{
返回smFieldValue.Split（'|'）[1];
} 返回的String.Empty;
}
以上方法使用的ScriptManager的隐藏字段页面上。它的值可以在服务器上通过搜索使用ScriptManager的UniqueID形式键来访问。在隐藏字段中的值的格式为 [UpdatePanel中的UniqueID] | [回传控制ID] 。知道了这些信息，我们可以检索启动异步回发的控件的ID。和它的作品的提交按钮了。
Related to this question: On postback, how can I check which control cause postback in Page_Init event
If the control is wrapped in an ASP.NET AJAX UpdatePanel, the variable "control" is empty because it has a different ID after the AJAX PostBack. Is there a solution to get the control which fired a postback within an ASP.NET Ajax UpdatePanel?
public static string GetPostBackControlName( Page page ) {
Control control = null;
/**
* First we will check the "__EVENTTARGET" because if the postback is made
* by controls which used the _doPostBack function, it will be available in the Request.Form collection.
*/
string ctrlname = page.Request.Params["__EVENTTARGET"];
if ( !String.IsNullOrEmpty( ctrlname ) ) {
control = page.FindControl( ctrlname );
} else {
/**
* If __EVENTTARGER is null, the control is a button-type and
* need to iterate over the form collection to find it.
*/
Control c = null;
string ctrlStr = null;
foreach ( string ctl in page.Request.Form ) {
if ( ctl.EndsWith( ".x" ) || ctl.EndsWith( ".y" ) ) {
/**
* ImageButtons have an additional "quasi-property" in their ID which identifies
* the mouse-coordinates (X and Y).
*/
ctrlStr = ctl.Substring( 0, ctl.Length - 2 );
c = page.FindControl( ctrlStr );
} else {
c = page.FindControl( ctl );
}
if ( c is Button || c is ImageButton ) {
control = c;
break;
}
}
}
if ( control != null ) {
return control.ID;
}
return string.Empty;
}
Try the following method:
public string GetAsyncPostBackControlID()
{
string smUniqueId = ScriptManager.GetCurrent(Page).UniqueID;
string smFieldValue = Request.Form[smUniqueId];
if (!String.IsNullOrEmpty(smFieldValue) && smFieldValue.Contains('|'))
{
return smFieldValue.Split('|')[1];
}
return String.Empty;
}
The above method uses the hidden field of the ScriptManager on page. Its value can be accessed on the server by searching for a form key with the UniqueID of the ScriptManager. The value in the hidden field is in the format [UpdatePanel UniqueID]|[Postback Control ID]. Knowing this information we can retrieve the ID of the control that initiated the asynchronous postback. And it works for submit buttons too.
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