在回发时，如何检查Page_Init事件中哪个控件导致回发

我看到已经有一些很好的建议和方法建议如何获得回发控制。但是，我发现了另一个网页（Mahesh博客），该网页具有一种检索回发控件ID的方法。

我将在此处进行一些修改，包括使其成为扩展类。希望它以这种方式更有用。

/// <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") || 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;}

更新（2016-07-22）： 键入check for

Button

ImageButton

IButtonControl