asp.net - 哪个控件导致了回发？

Question

我有两个按钮:

<asp:Button ID="Button1" runat="server" Text="Button" />
<asp:Button ID="Button2" runat="server" Text="Button" />

如何在 pageLoad 上确定这两者中哪一个导致了回发？据我所知，只有两个控件可以导致此回发，是否有一个简短的解决方案？

Answer 1

您可以使用此方法来获取导致回发的控件:

/// <summary>
/// Retrieves the control that caused the postback.
/// </summary>
/// <param name="page"></param>
/// <returns></returns>
private Control GetControlThatCausedPostBack(Page page)
{
    //initialize a control and set it to null
    Control ctrl = null;

    //get the event target name and find the control
    string ctrlName = page.Request.Params.Get("__EVENTTARGET");
    if (!String.IsNullOrEmpty(ctrlName))
        ctrl = page.FindControl(ctrlName);

    //return the control to the calling method
    return ctrl;
}