How Can I Add a Single Line to a Text File Without Overwriting It?

Append a single line of text to an existing text file

Goal: Append a line of text to an existing text file without overwriting the existing content.

Solution:

For this you can use the File.AppendAllText method. This method accepts two parameters:

1. The path to the text file to which the text is to be appended.
2. The text content you wish to add to the file.

Example usage:

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

Instructions:

• The first parameter specifies the path to the text file. In this example, we assume the file is located at c:pathfile.txt.
• The second parameter is the text string to be appended to the file. To ensure that a newline is created after the text, we append it using Environment.NewLine. This is necessary to create new lines in text files.

Use File.AppendAllText to conveniently add a line of text to an existing file without affecting its current content.

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