C# asp.net webforms dynamically-generated

动态创建/加载用户控件只能工作一次！

发布于 2024-11-24 05:54:49 字数 455 浏览 0 评论 0原文

protected void addMoreDay_btn_Click(object sender, EventArgs e)
        {
            Control OneMoreDay = LoadControl("~/controls/Days/DayAdd.ascx");
            Days_div.Controls.Add(OneMoreDay);
        }

我将 userControl 动态加载到 div 元素..但问题是它只能工作一次！ .. 我的意思是我单击 addMoreDay_btn 按钮，它起作用了，然后我尝试再次单击它，它不会创建我的控件的另一个实例！

编辑

我认为它可以工作，但它不会保存最后创建的控件..它只是用新创建的控件替换它..但我仍然不知道如何解决这个问题！ =S

原文

protected void addMoreDay_btn_Click(object sender, EventArgs e)
        {
            Control OneMoreDay = LoadControl("~/controls/Days/DayAdd.ascx");
            Days_div.Controls.Add(OneMoreDay);
        }

I load my userControl dynamically to a div element .. but the problem is that it works only once! .. I mean I click the addMoreDay_btn button and it works then I try to click it again it won't create another instance of my control!

Edit

I think it works but it doesn't save the last created one .. it just replaces it with the newly created control .. and still I don't how to solve this! =S

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め七分饶幸 2024-12-01 05:54:49

出现此问题的原因是动态添加的控件在每次回发时在再次创建之前被销毁。为了让动态控件在回发过程中持续存在，您必须在每次页面回发时添加它们。

尝试以下代码。请注意，控件是在 Page_Init 方法中添加的：

protected void addMoreDay_btn_Click(object sender, EventArgs e)
{
    Control OneMoreDay = LoadControl("~/controls/Days/DayAdd.ascx");
    Days_div.Controls.Add(OneMoreDay);
    Session["MyControl"] += 1
}


protected void Page_Init(object sender, EventArgs e)
{
    for (int i = 1; i <= (int)Session["MyControl"]; i++) {
        Control OneMoreDay = LoadControl("~/controls/Days/DayAdd.ascx");
        Days_div.Controls.Add(OneMoreDay);        
    }
}

请参阅此处

The problem is occurring because the dynamically added control is being destroyed on each postback right before it is created again. In order to have dynamic controls persist across postbacks, you'll have to add them every time the page posts back.

Try the following code. Notice that the controls are being added in the Page_Init method:

protected void addMoreDay_btn_Click(object sender, EventArgs e)
{
    Control OneMoreDay = LoadControl("~/controls/Days/DayAdd.ascx");
    Days_div.Controls.Add(OneMoreDay);
    Session["MyControl"] += 1
}


protected void Page_Init(object sender, EventArgs e)
{
    for (int i = 1; i <= (int)Session["MyControl"]; i++) {
        Control OneMoreDay = LoadControl("~/controls/Days/DayAdd.ascx");
        Days_div.Controls.Add(OneMoreDay);        
    }
}

See here

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