Question

在asp.net（c＃）中，如何找出哪个asp：按钮触发了回发？

我正在将它用于动态控件，并希望针对不同的按钮对页面加载执行不同的处理。我曾尝试查看__EVENTARGUMENTS等，但他们没有工作。

我希望做这样的事情：

的Page_Load 案件：按钮1单击 //做一点事单击按钮2 //做点什么

Answer 1

使用以下代码。

  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 Button || foundControl is ImageButton)) continue;

                    control = foundControl;
                    break;
                }
            }

            return control == null ? String.Empty : control.ID;
        }

调用此功能：

我已将上述函数包含在静态类UtilityClass中。

String postBackControlId = UtilityClass.GetPostBackControlId(this);

代码已从 Mahesh's Blog 引用。

如何找出触发回发的按钮？

1 个答案: