C# .NET UserControl 事件问题

发布于 2024-08-04 08:42:45 字数 1096 浏览 2 评论 0原文

我有一个 UpdatePanel，其中有一个常规面板。在面板中，我动态添加简单的用户控件。用户控件有一个按钮和一个标签。当我单击控件中的按钮时，它会删除我动态添加的面板中的所有控件。有人可以帮忙吗？

    int controlID = 0;
    List<Control> cc = new List<Control>();
    if (Session["ControlsCompleted"] != null)
    {
        cc = Session["ControlsCompleted"] as List<Control>;
        for (int i = 0; i < cc.Count; i++)
        {
            pnlCompletedEducation.Controls.Add(cc[i]);
        }
        controlID = cc.Count;
    }
    Controls_TestWebUserControl ct = LoadControl(@"Controls\TestWebUserControl.ascx") as Controls_TestWebUserControl;
    ct.ID = controlID.ToString();
    cc.Add(ct);
    ct.EnableViewState = true;
    pnlCompletedEducation.Controls.Add(ct);
    txtInstitutionName.Text = controlID.ToString();
    List<Control> lc = new List<Control>();
    for (int i = 0; i < pnlCompletedEducation.Controls.Count; i++)
    {
        lc.Add(pnlCompletedEducation.Controls[i]);
    }
    Session["ControlsCompleted"] = lc;

这就是我将控件添加到面板的方法。我必须将它们保存在某个地方，而我无法使用 ViewState 来做到这一点，所以我使用了 Session，这是一个坏主意。

原文

I have an UpdatePanel and in it a regular Panel. In the Panel I dynamically add simple UserControls. The Usercontrol has a Button and a Label. When I click on a button in a control it removes all controls in the Panel which I have added dynamically.
Can anyone help?

    int controlID = 0;
    List<Control> cc = new List<Control>();
    if (Session["ControlsCompleted"] != null)
    {
        cc = Session["ControlsCompleted"] as List<Control>;
        for (int i = 0; i < cc.Count; i++)
        {
            pnlCompletedEducation.Controls.Add(cc[i]);
        }
        controlID = cc.Count;
    }
    Controls_TestWebUserControl ct = LoadControl(@"Controls\TestWebUserControl.ascx") as Controls_TestWebUserControl;
    ct.ID = controlID.ToString();
    cc.Add(ct);
    ct.EnableViewState = true;
    pnlCompletedEducation.Controls.Add(ct);
    txtInstitutionName.Text = controlID.ToString();
    List<Control> lc = new List<Control>();
    for (int i = 0; i < pnlCompletedEducation.Controls.Count; i++)
    {
        lc.Add(pnlCompletedEducation.Controls[i]);
    }
    Session["ControlsCompleted"] = lc;

This is how I add the controls to the panel. I had to keep them somewhere, and i couldn't do it with the ViewState, so i used a Session, which is a bad idea.

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千秋岁 2024-08-11 08:42:45

您说您正在动态添加用户控件。您是否有这样的代码：

void Page_Load(...)    
{
     if (!IsPostback)
        // AddUserControl here.
}

您需要在每个请求以及回发期间添加用户控件，因为它不会存储在您修改了控件树的视图状态中。

You say that you are adding the user control dynamically. Are you having code like this:

void Page_Load(...)    
{
     if (!IsPostback)
        // AddUserControl here.
}

You need to add the user control during every request, also postbacks, because it will not be stored in the view state that you have modified the control tree.

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