How Can I Efficiently Delete Lines from Text Files in C#?
Posted on 2025-03-24
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Efficient Line Deletion in C# Text Files
Working with text files often requires removing specific lines. This article explores efficient C# methods for accomplishing this task, especially when dealing with large files.
One effective technique involves a temporary file. The original file is read line by line; lines to be kept are written to the temporary file. Finally, the temporary file replaces the original.
Alternatively, LINQ offers a concise solution leveraging deferred execution. ReadLines and Where filter the lines, and the filtered result is written to a temporary file, overwriting the original.
Both approaches avoid loading the entire file into memory, crucial for large files. For smaller files, in-memory filtering might be simpler.
Remember to specify the encoding, with UTF-8 recommended for cross-platform compatibility. All examples below assume UTF-8.
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