从 <textarea> 获取文本时保留换行符

Question

我正在使用带有 C# 和 HTML 的 Visual Web Developer 构建一个站点。

我有一个页面，用户可以在 textarea 标签中写下关于我网站的反馈，然后提交（在 textarea 中，他们可以在任何地方换行）。

问题是当我取回他们写的文本时，它没有换行符，例如：

如果用户写道：

"Hello, my name is
Omer N."

当我取回它时，它看起来像这样："Hello, my name is Omer N."。

我该如何解决这个问题？

Answer 1

取决于您存储值的方式。请记住，HTML 和遵循白色 space 规则的字段的一般输入，它将 truncate/condense 白色 space 合并为一个实体。

So "Wide      String" = "Wide String" and:

"Multi-line
string
here" will be truncated to "Multi-line string here" as you have experienced.

这是默认行为。

因此，要保留换行符、间距等。您需要 escape it or a process of encoding and decoding，然后再存储它。

说明here:

Many newcomers to web development cannot get their head around why the carriage returns they made in their data on input from a textarea, or from a text file, Excel spreadsheet etc. do not appear when the web page renders.

The solution is fairly obvious once the newcomer realizes that a web page is only the browser's interpretation of html markup, and that a new line in html is represented by the
tag. So what is needed is a way to swap carriage returns or line feeds with the
tag. Well, a way to Replace() them, actually.

<%# Eval("MyMultiLineValue").ToString().Replace(<linebreak>,"<br />") %>

The string.Replace() method allows this, but we also need to identify what we want to replace with the html tag. How is a new line represented in C# or VB.Net?

In C#, it's "\r\n", while in VB.Net, it's vbcrlf. However, there is also a language independent option that does just the same thing: Environment.NewLine.

<%# Eval("MyMultiLineValue").ToString().Replace(Environment.NewLine,"<br />") %>

希望对您有所帮助！ :)

从 <textarea> 获取文本时保留换行符

Keep linebreaks when getting text from <textarea>

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