blocks|key|3747503|text|可以直接在表单参数中使用，或者|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3747504|string+controlName+=+this.Request.Params.Get("__EVENTTARGET");|code-block|syntax|javascript|3747505|编辑：检查控件是否导致回发(手动)：|offset|length|style|BOLD|3747506|//+input+Image+with+name="imageName"
if+(this.Request["imageName"%2B".x"]+!=+null)+...;//caused+postBack

//+Other+input+with+name="name"
if+(this.Request["name"]+!=+null)+...;//caused+postBack|3747507|您还可以使用上面的代码遍历所有控件，并检查其中是否有一个控件导致了postBack。|3747508|entityMap^0|0|0|0|2|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Either directly in form parameters or

<pre><code>string controlName = this.Request.Params.Get("__EVENTTARGET");
</code></pre>

Edit: To check if a control caused a postback (manually):

<pre><code>// input Image with name="imageName"
if (this.Request["imageName"+".x"] != null) ...;//caused postBack

// Other input with name="name"
if (this.Request["name"] != null) ...;//caused postBack
</code></pre>

You could also iterate through all the controls and check if one of them caused a postBack using the above code.

blocks|key|688037|text|假设它是一个服务器控件，您可以使用Request["ButtonName"]|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|688038|查看是否单击了特定按钮：if+(Request["ButtonName"]+!=+null)|688039|entityMap^0|H|L|0|C|Y|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

Assuming it's a server control, you can use <code>Request["ButtonName"]</code>

To see if a specific button was clicked: <code>if (Request["ButtonName"] != null)</code>

blocks|key|2339632|text|下面的代码可能会帮你解决这个问题(摘自Ryan+Farley's+blog)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2339633|public+static+Control+GetPostBackControl(Page+page)
{
++++Control+control+=+null;

++++string+ctrlname+=+page.Request.Params.Get("__EVENTTARGET");
++++if+(ctrlname+!=+null+&&+ctrlname+!=+string.Empty)
++++{
++++++++control+=+page.FindControl(ctrlname);
++++}
++++else
++++{
++++++++foreach+(string+ctl+in+page.Request.Form)
++++++++{
++++++++++++Control+c+=+page.FindControl(ctl);
++++++++++++if+(c+is+System.Web.UI.WebControls.Button)
++++++++++++{
++++++++++++++++control+=+c;
++++++++++++++++break;
++++++++++++}
++++++++}
++++}
++++return+control;
}|code-block|syntax|javascript|2339634|entityMap|0|LINK|mutability|MUTABLE|url|http://ryanfarley.com/blog/archive/2005/03/11/1886.aspx^0|J|I|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Here's some code that might do the trick for you (taken from <a href="http://ryanfarley.com/blog/archive/2005/03/11/1886.aspx" rel="noreferrer">Ryan Farley's blog</a>)

<pre><code>public static Control GetPostBackControl(Page page)
{
 Control control = null;

 string ctrlname = page.Request.Params.Get("__EVENTTARGET");
 if (ctrlname != null &amp;&amp; ctrlname != string.Empty)
 {
 control = page.FindControl(ctrlname);
 }
 else
 {
 foreach (string ctl in page.Request.Form)
 {
 Control c = page.FindControl(ctl);
 if (c is System.Web.UI.WebControls.Button)
 {
 control = c;
 break;
 }
 }
 }
 return control;
}
</code></pre>

blocks|key|1431559|text|我看到已经有一些很好的建议和方法来建议如何让帖子重新获得控制权。但是，我发现了另一个网页(Mahesh+blog)，其中包含一个检索回发控件ID的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1431560|我将在这里发布它，并进行一些修改，包括使其成为一个扩展类。希望它能以这种方式更有用。|1431561|///+<summary>
///+Gets+the+ID+of+the+post+back+control.
///+
///+See:+http://geekswithblogs.net/mahesh/archive/2006/06/27/83264.aspx
///+</summary>
///+<param+name+=+"page">The+page.</param>
///+<returns></returns>
public+static+string+GetPostBackControlId(this+Page+page)
{
++++if+(!page.IsPostBack)
++++++++return+string.Empty;

++++Control+control+=+null;
++++//+first+we+will+check+the+"__EVENTTARGET"+because+if+post+back+made+by+the+controls
++++//+which+used+"_doPostBack"+function+also+available+in+Request.Form+collection.
++++string+controlName+=+page.Request.Params["__EVENTTARGET"];
++++if+(!String.IsNullOrEmpty(controlName))
++++{
++++++++control+=+page.FindControl(controlName);
++++}
++++else
++++{
++++++++//+if+__EVENTTARGET+is+null,+the+control+is+a+button+type+and+we+need+to
++++++++//+iterate+over+the+form+collection+to+find+it

++++++++//+ReSharper+disable+TooWideLocalVariableScope
++++++++string+controlId;
++++++++Control+foundControl;
++++++++//+ReSharper+restore+TooWideLocalVariableScope

++++++++foreach+(string+ctl+in+page.Request.Form)
++++++++{
++++++++++++//+handle+ImageButton+they+having+an+additional+"quasi-property"+
++++++++++++//+in+their+Id+which+identifies+mouse+x+and+y+coordinates
++++++++++++if+(ctl.EndsWith(".x")+%7C%7C+ctl.EndsWith(".y"))
++++++++++++{
++++++++++++++++controlId+=+ctl.Substring(0,+ctl.Length+-+2);
++++++++++++++++foundControl+=+page.FindControl(controlId);
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++foundControl+=+page.FindControl(ctl);
++++++++++++}

++++++++++++if+(!(foundControl+is+IButtonControl))+continue;

++++++++++++control+=+foundControl;
++++++++++++break;
++++++++}
++++}

++++return+control+==+null+?+String.Empty+:+control.ID;
}|code-block|syntax|javascript|1431562|更新(2016-07-22)：针对Button和ImageButton的类型检查已更改为查找IButtonControl，以允许识别来自第三方控件的回发。|style|BOLD|CODE|1431563|entityMap|0|LINK|mutability|MUTABLE|url|http://geekswithblogs.net/mahesh/archive/2006/06/27/83264.aspx^0|19|B|0|0|0|0|0|10|H|6|O|B|1A|E|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|13|8|@$A|14|B|15|M|N]|$A|16|B|17|M|O]|$A|18|B|19|M|O]|$A|1A|B|1B|M|O]]|9|@]|C|$]]|$1|P|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]]|Q|$R|$5|S|T|U|C|$V|W]]]]

I see that there is already some great advice and methods suggest for how to get the post back control. However I found another web page (<a href="http://geekswithblogs.net/mahesh/archive/2006/06/27/83264.aspx" rel="noreferrer">Mahesh blog</a>) with a method to retrieve post back control ID.

I will post it here with a little modification, including making it an extension class. Hopefully it is more useful in that way.

<pre><code>/// &lt;summary&gt;
/// Gets the ID of the post back control.
/// 
/// See: http://geekswithblogs.net/mahesh/archive/2006/06/27/83264.aspx
/// &lt;/summary&gt;
/// &lt;param name = "page"&gt;The page.&lt;/param&gt;
/// &lt;returns&gt;&lt;/returns&gt;
public static string GetPostBackControlId(this Page page)
{
 if (!page.IsPostBack)
 return string.Empty;

 Control control = null;
 // first we will check the "__EVENTTARGET" because if post back made by the controls
 // which used "_doPostBack" function also available in Request.Form collection.
 string controlName = page.Request.Params["__EVENTTARGET"];
 if (!String.IsNullOrEmpty(controlName))
 {
 control = page.FindControl(controlName);
 }
 else
 {
 // if __EVENTTARGET is null, the control is a button type and we need to
 // iterate over the form collection to find it

 // ReSharper disable TooWideLocalVariableScope
 string controlId;
 Control foundControl;
 // ReSharper restore TooWideLocalVariableScope

 foreach (string ctl in page.Request.Form)
 {
 // handle ImageButton they having an additional "quasi-property" 
 // in their Id which identifies mouse x and y coordinates
 if (ctl.EndsWith(".x") || ctl.EndsWith(".y"))
 {
 controlId = ctl.Substring(0, ctl.Length - 2);
 foundControl = page.FindControl(controlId);
 }
 else
 {
 foundControl = page.FindControl(ctl);
 }

 if (!(foundControl is IButtonControl)) continue;

 control = foundControl;
 break;
 }
 }

 return control == null ? String.Empty : control.ID;
}
</code></pre>

Update (2016-07-22): Type check for <code>Button</code> and <code>ImageButton</code> changed to look for <code>IButtonControl</code> to allow postbacks from third party controls to be recognized.

blocks|key|2339710|text|如果您需要检查哪个控件导致了回发，那么您可以直接将["__EVENTTARGET"]与您感兴趣的控件进行比较：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2339711|if+(specialControl.UniqueID+==+Page.Request.Params["__EVENTTARGET"])
{
++++/*do+special+stuff*/
}|code-block|syntax|javascript|2339712|这里假设您只是要比较来自任何GetPostBackControl(...)扩展方法的结果。它可能不能处理所有情况，但如果它能工作，它就会更简单。此外，您不会在页面中搜索一开始并不关心的控件。|2339713|entityMap^0|P|H|0|0|E|N|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

If you need to check which control caused the postback, then you could just directly compare <code>["__EVENTTARGET"]</code> to the control you are interested in:

<pre><code>if (specialControl.UniqueID == Page.Request.Params["__EVENTTARGET"])
{
 /*do special stuff*/
}
</code></pre>

This assumes you're just going to be comparing the result from any <code>GetPostBackControl(...)</code> extension method anyway. It may not handle EVERY situation, but if it works it is simpler. Plus, you won't scour the page looking for a control you didn't care about to begin with.

blocks|key|3747665|text|if+(Request.Params["__EVENTTARGET"]+!=+null)
{
++if+(Request.Params["__EVENTTARGET"].ToString().Contains("myControlID"))
++{
++++DoWhateverYouWant();
++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3747666|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if (Request.Params["__EVENTTARGET"] != null)
{
 if (Request.Params["__EVENTTARGET"].ToString().Contains("myControlID"))
 {
 DoWhateverYouWant();
 }
}
</code></pre>

blocks|key|2339768|text|除了前面的答案之外，要使用Request.Params["__EVENTTARGET"]，您必须设置以下选项：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2339769|buttonName.UseSubmitBehavior+=+false;|code-block|syntax|javascript|2339770|entityMap^0|D|V|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

An addition to previous answers, to use <code>Request.Params["__EVENTTARGET"]</code> you have to set the option:

<pre><code>buttonName.UseSubmitBehavior = false;
</code></pre>

blocks|key|3747737|text|要获取控件的确切名称，请使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3747738|++++string+controlName+=+Page.FindControl(Page.Request.Params["__EVENTTARGET"]).ID;|code-block|syntax|javascript|3747739|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To get exact name of control, use:

<pre><code> string controlName = Page.FindControl(Page.Request.Params["__EVENTTARGET"]).ID;
</code></pre>

On postback, how can I check which control cause postback in Page_Init event. 

<pre><code>protected void Page_Init(object sender, EventArgs e)
{
//need to check here which control cause postback?

}
</code></pre>

Thanks

On postback, how can I check which control cause postback in Page_Init event

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在回发时，如何在Page_Init事件中检查导致回发的控件。protected void Page_Init(object sender, EventArgs e){//need to check here which control cause postback?}谢谢

问在回发时，如何在Page_Init事件中检查导致回发的控件
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问在回发时，如何在Page_Init事件中检查导致回发的控件EN