Multiline TextBox multiple newline

问题

I set a value for a Multiline Textbox like this.

textBox1.Text = "Line1\r\n\r\nLine2";

But, only one line space in output.

When I read the value of textbox, I read "Line1\r\nLine2";

Why does ASP.NET not support more then one lineline character?

回答1:

I had the same problem. If I add one Environment.Newline I get one new line in the textbox. But if I add two Environment.Newline I get one new line. In my web app I use a whitespace modul that removes all unnecessary white spaces. If i disable this module I get two new lines in my textbox. Hope that helps.

回答2:

You need to set the textbox to be multiline, this can be done two ways:

In the control:

<asp:TextBox runat="server" ID="MyBox" TextMode="MultiLine" Rows="10" />

Code Behind:

MyBox.TextMode = TextBoxMode.MultiLine;
MyBox.Rows = 10;

This will render as a <textarea>

回答3:

textBox1.Text = "Line1" + Environment.NewLine + "Line2";

Also the markup needs to include TextMode="MultiLine" (otherwise it shows text as one line)

<asp:TextBox ID="multitxt" runat="server" TextMode="MultiLine" ></asp:TextBox>

回答4:

Try this one

textBox1.Text = "Line1" + Environment.NewLine + "Line2";

Working fine for me...

回答5:

When page IsPostback, the following code work correctly. But when page first loading, there is not multiple newline in the textarea. Bug

textBox1.Text = "Line1\r\n\r\n\r\nLine2";

回答6:

While dragging the TextBox it self Press F4 for Properties and under the Textmode set to Multiline, The representation of multiline to a text box is it can be sizable at 6 sides. And no need to include any newline characters for getting multiline. May be you set it multiline but you dint increased the size of the Textbox at design time.

回答7:

textBox1.Text = "Line1\r\r\Line2";
Solved the problem.

来源：https://stackoverflow.com/questions/5909864/multiline-textbox-multiple-newline