How Do I Append a Single Line to a Text File in C#?

Append single line to text file

This section explains how to append a line of text to an existing text file:

Question:

How do I open a text file, append a line of text to it, and then close the file?

Answer:

This function can be achieved using the File.AppendAllText method:

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

namespace 文件操作
{
    class Program
    {
        static void Main(string[] args)
        {
            string filePath = @"c:\path\file.txt";

            // 向文件追加一行文本。
            File.AppendAllText(filePath, "文本内容" + Environment.NewLine);
        }
    }
}</code>

In this example, the File.AppendAllText method takes as parameters the file path and the text content to be appended. Environment.NewLineConstant is used to ensure that text content is appended to the file on a new line.

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