动态创建的控件在回发后丢失数据 [英] Dynamically Created Controls losing data after postback

问题描述

实际上，我正在 Pageload 上创建 1 个 TextBox 并将该 TextBox 添加到 Panel.现在，我有一个 LinkBut​​ton 像 Add Another.

Actually, I am Creating 1 TextBox on Pageload and adding that TextBox to Panel. Now, I have a LinkButton like Add Another.

我正在该 TextBox 中输入文本，如果需要，我需要通过单击 Add Another LinkBut​​ton 创建新的 TextBox.

I am entering Text in that TextBox and if needed I need to Create New TextBox,by clicking Add Another LinkButton.

实际上，我能够获得计数并重新创建TextBoxes.但是，问题是，我在以前生成的 Textboxes 中输入的文本丢失了.

Actually, I am able to get the count and recreate the TextBoxes. But,the Problem is that, My Entered text in the Previously Generated Textboxes is Missing.

任何人都可以为我推荐一个解决方案吗?

Can Anyone,Suggest me a solution for this?

protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            if (!IsPostBack)
            {
                for (int i = 0; i < 5; i++)
                {
                    TableRow row = new TableRow();
                    for (int j = 0; j < 5; j++)
                    {
                        TableCell cell = new TableCell();
                        TextBox tb = new TextBox();                        
                        tb.ID = "TextBoxRow_" + i + "Col_" + j;                        
                        cell.Controls.Add(tb);                        
                        row.Cells.Add(cell);
                    }                    
                    Table1.Rows.Add(row);
                }
            }
        }
        catch (Exception ex)
        {
            throw;
        }        
    }

这是一个示例代码，同样的代码写在Button_Click 也

This is a Sample Code, the same code is written in Button_Click Also

 protected void ASPxButton1_Click(object sender, EventArgs e)
    {
 int k = Table1.Controls.Count;
}

我在 Button_Click 上得到一个 Count=0.

I am getting a Count=0 on Button_Click.

推荐答案

您所需要做的就是在回发期间每次在页面加载事件之前或之内重新实例化/重新初始化动态控件并将此控件添加到页面/表单/占位符.然后，通过父控件调用LoadPostData方法，将发布的数据自动分配给控件.

All you need to do is to re-instantiate / reinitialize dynamic controls before or within page load event each and every time during postback and add this control to page / forms / placeholders. Then, the posted data will automatically be assigned to the control by calling the LoadPostData method by the parent control.

查看文章以及如何编写动态控制的代码-如何维护动态控制事件，asp.net回发时的数据

check the article and how to write code for dynamic control - How to maintain dynamic control events, data during postback in asp.net

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