插入文本框到一个中继动态和检索其价值 [英] Insert TextBoxes into a Repeater dynamically and retrieve their value

问题描述

我从SQL绑定一个中继器，包含可编辑和只读元素的混合物。当你点击某行的编辑按钮，可编辑的部分应转换为文本框，当您单击更新，它应该保存更改。

I have a Repeater bound from SQL, containing a mixture of editable and read-only elements. When you click the "Edit" button on a row, the editable portions should convert to textboxes, and when you click "Update", it should save your changes.

下面是一个（非常）简化了编辑和更新按钮的onClick code版本：

Here's a (very) simplified version of the Edit and Update buttons' OnClick code:

switch(commandName)
{
    case "Edit":
        Label1.Visible = false; //hide read-only version
        PlaceHolder1.Visible = true; //show editing version

        //Dict1 is Dictionary<string, string> in this example.
        foreach (var key in Dict1)
        {
            //insert a TextBox dynamically into the PlaceHolder
            PlaceHolder1.Controls.Add(new TextBox 
            { 
                ID = "txt" + key, 
                Text = Dict1[key] 
            });
        }
        break;

    case "Update":
        //retrieve user input from dynamically-added TextBoxes
        foreach (var TextBox1 in PlaceHolder1.Controls.Where(c => c.ID.StartsWith("txt")))
        {
            doStuff(TextBox1);
        }

        Label1.Visible = true; //show read-only version
        PlaceHolder1.Visible = false; //hide editing version
        break;
}

问题是，我的动态添加文本框是不是有当页面回。我已经研究在调试器 PlaceHolder1.Controls ，有它无文本框。 PLACEHOLDER1 本身是一个中继器里面，但我不会重新绑定在回发的中继器。

The problem is that my dynamically-added TextBoxes aren't there when the page posts back. I've examined PlaceHolder1.Controls in the debugger, and there are no TextBoxes in it. PlaceHolder1 itself is inside a Repeater, but I'm not rebinding the Repeater on PostBack.

我在地方TextBox控件的使用原始的HTML和拉动值出的Request.Form的考虑，但那种感觉的hackish给我。我怎样才能使动态添加文本框在回传执着？

I've considered using raw HTML in place of TextBox controls and pulling the values out of Request.Form, but that feels hackish to me. How can I make the dynamically-added TextBoxes persistent across postbacks?

编辑：

有一些并发症这里，很难展现一个没有样品每吨code的。这里是大的：

There are some complications here that it's hard to show without a ton of sample code. Here are the big ones:

• 在中继器的每个单元格可以有只读和可编辑的文本的混合物（即动态插入标签和文本框）


• 我不知道有多少可编辑区域将如何在每个单元格。原文可能类似于等等等等@ A1 @等等等等@ A2 @等等... ，我将不得不插入替换文本到位@ A1 @，@的A2 @等。在编辑模式下，只有替换文本可编辑。

• Each cell in the repeater can have a mixture of read-only and editable text (i.e. dynamically-inserted Labels and TextBoxes)
• I don't know how many editable regions are going to be in each cell. The original text might look like blah blah @A1@ blah blah @A2@ blah..., and I would have to insert replacement text in place of @A1@, @A2@, etc. In edit mode, only that replacement text is editable.

推荐答案

当您添加控件动态，他们不是在回传pserved $ P $。你必须给他们回传后再次添加到页面。我通常做在Page_Load中。然后，一旦他们加入，他们的回发状态将被正确后来在ASP.NET页面生命周期恢复。

When you add controls dynamically, they aren't preserved across postbacks. You have to add them to the page again after postback. I usually do it in Page_Load. Then, once they are added, their postback states will be restored correctly later in the ASP.NET page life cycle.

因此​​，

• 动态控制必须在每次页面加载时间增加，


• 但是一旦你添加它们，ASP.NET正确地恢复自己的状态。

希望这有助于！

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