在 UpdatePanel 内回发后添加用户控件，然后再进行另一个回发 - 如何获取用户控件内控件的输入？

发布于 2024-12-06 00:17:40 字数 1304 浏览 2 评论 0原文

我有一个用户控件，在 UpdatePanel 中执行回发后，该控件会动态加载到页面。

然后，我执行另一个回发以进行保存，其中我想访问该用户控件中控件的用户输入（例如，每行都有一个复选框的网格）。

如果此场景如下所示，则为一个简化示例：

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <div><asp:Button ID="ButtonAdd" runat="server" Text="Add User Control" OnClick="ButtonAdd_OnClick" /></div>
        <div id="divContent" runat="server"></div>
    </ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
    <ContentTemplate>
        <div><asp:Button ID="ButtonSave" runat="server" Text="Save" OnClick="ButtonSave_OnClick" /></div>
    </ContentTemplate>
</asp:UpdatePanel>

并且：

protected void ButtonAdd_OnClick(object sender, EventArgs e)
{
    MyUserControl uc = Page.LoadControl("MyUserControl.ascx") as MyUserControl;
    divContent.Controls.Add(uc);
}

protected void ButtonSave_OnClick(object sender, EventArgs e)
{
    // Hopefully, get controls from within the user control's grid and save their input
}

问题是单击“保存”按钮后，用户控件消失了。这是可以理解的，我再次创建和添加它没有问题 - 但我确实想访问用户输入并保存它。我怎样才能做到这一点？

原文

I have a user control which is being loaded to the page dynamically after performing a postback within an UpdatePanel.

Then I'm performing another postback for saving, where I would like to access the user input for the controls within that user control (for example, a grid with a checkbox in every row).

A simplified example if this scenario would be something as follows:

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <div><asp:Button ID="ButtonAdd" runat="server" Text="Add User Control" OnClick="ButtonAdd_OnClick" /></div>
        <div id="divContent" runat="server"></div>
    </ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
    <ContentTemplate>
        <div><asp:Button ID="ButtonSave" runat="server" Text="Save" OnClick="ButtonSave_OnClick" /></div>
    </ContentTemplate>
</asp:UpdatePanel>

And:

protected void ButtonAdd_OnClick(object sender, EventArgs e)
{
    MyUserControl uc = Page.LoadControl("MyUserControl.ascx") as MyUserControl;
    divContent.Controls.Add(uc);
}

protected void ButtonSave_OnClick(object sender, EventArgs e)
{
    // Hopefully, get controls from within the user control's grid and save their input
}

The problem is that after the save button is clicked, the user control is gone. That's understandable and I have no problem creating and adding it again - but I do want to access the user input and save it. How can I do that?

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鼻尖触碰 2024-12-13 00:17:40

如果您想以编程方式添加控件，请选择Page_Load（更推荐）或Page_Init事件。您可以通过使用 visible=false “静态”（设计时）添加控件来解决您的问题，稍后您可以打开其可见性。

如果您想像帖子中那样坚持当前的方法，则必须使用一个技巧。

MyUserControl uc;

protected void Page_Load()
{
   if(ViewState["isAdd"]!=null)
    {
       AddControl();
    }
}

void AddControl()
{
    uc = Page.LoadControl("MyUserControl.ascx") as MyUserControl;
    divContent.Controls.Add(uc);
}

protected void ButtonAdd_OnClick(object sender, EventArgs e)
{
    if(ViewState["isAdd"]==null)
        AddControl();
    ViewState["isAdd"]="yes";
}

If you want to add controls programatically then choose Page_Load (more preferred) or Page_Init event. You can solve your problem by adding control "statically" (design time) with visible=false and later you may turn on its visibility.

In case you want stick with current approach as in your post, you have to use a trick.

MyUserControl uc;

protected void Page_Load()
{
   if(ViewState["isAdd"]!=null)
    {
       AddControl();
    }
}

void AddControl()
{
    uc = Page.LoadControl("MyUserControl.ascx") as MyUserControl;
    divContent.Controls.Add(uc);
}

protected void ButtonAdd_OnClick(object sender, EventArgs e)
{
    if(ViewState["isAdd"]==null)
        AddControl();
    ViewState["isAdd"]="yes";
}

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