回发后动态创建的控件丢失数据

Dynamically Created Controls losing data after postback(回发后动态创建的控件丢失数据)

问题描述

实际上，我在 Pageload 上创建 1 个 TextBox 并将该 TextBox 添加到 Panel.现在，我有一个 LinkBut​​ton，例如 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 来创建新的 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，我可以获取计数并重新创建 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.

任何人都可以给我一个解决方案吗?

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

您只需在每次回发期间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代码 -如何维护动态控制事件，asp.net中回发期间的数据

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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