在asp.net中即时创建多个标签 [英] Create multiple labels on fly in asp.net

问题描述

我想根据用户输入的编号动态创建多个标签.例如，如果用户在文本框中写入10，则应使用ID label1-label10创建10个标签，而我想在这些标签中放置单独的文本.任何想法如何使用c#尖锐代码在asp.net中做到这一点?

I want to create multiple labels on fly based on the number entered by user. For example if user writes 10 in textbox, 10 labels should be created with id label1 - label10 and i want to put separate text in those labels. Any idea how to do it in asp.net with c# sharp code ?

推荐答案

类似以下内容将使您入门.

Something like the following should get you started.

// get user input count from the textbxo
string countString = MyTextBox.Text;
int count = 0;

// attempt to convert to a number
if (int.TryParse(countString, out count))
{
    // you would probably also want to validate the number is
    // in some range, like 1 to 100 or something to avoid
    // DDOS attack by entering a huge number.

    // create as many labels as number user entered
    for (int i = 1; i <= count; i++)
    {
        // setup label and add them to the page hierarchy
        Label lbl = new Label();
        lbl.ID = "label" + i;
        lbl.Text = "The Label Text.";
        MyParentControl.Controls.Add(lbl);
    }
}
else
{
    // if user did not enter valid number, show error message
    MyLoggingOutput.Text = "Invalid number: '" + countString + "'.";
}

当然，您需要纠正:

1. 对于 MyTextBox
，您的实际文本框是什么
2. 标签中包含什么文本.
3. 哪些父控件用于将标签添加到页面的 MyParentControl .
4. 该数字无效时该怎么办，即 MyLoggingOutput .
5. 正确验证，即不允许用户输入数字> 100或<1，例如.您可以使用自定义代码或验证控件(例如 RangeValidator 和 CompareValidator )进行处理.

1. What your actual textbox is, for MyTextBox
2. What text you have in your labels.
3. What parent control MyParentControl for adding the labels to the page.
4. What to do when the number is invalid, i.e., MyLoggingOutput.
5. Proper validation, i.e., don't allow user to enter number > 100 or < 1, for example. You could handle with custom code or with validation controls, such as RangeValidator and CompareValidator.

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