How to Append a Single Line to a File in C#?

Append a single line to an existing file

To append a single line to an existing file, use the File.AppendAllText method. This method allows you to open a file in append mode, add the required lines of text, and then automatically close the file.

How to use File.AppendAllText:

The following code block demonstrates how to use File.AppendAllText to append a line to a file:

<code class="language-csharp">using System.IO;
...

File.AppendAllText(@"c:\path\file.txt", "文本内容" + Environment.NewLine);</code>

In this example, we use File.AppendAllText to open the file located at 'c:pathfile.txt' in append mode. We append a line of "text content" followed by a newline character, ensuring it is added to the file as a new line. After the code executes successfully, the appended lines are automatically written to the file.

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