How Can I Efficiently Read a Large Text File in Reverse Using C# Iterators?

C#iterator implementation text file reverse read

When processing large text files (especially more than hundreds of thousands of lines), memory consumption may become a bottleneck. The iterator provides an efficient memory management method that reads the data through incremental reading to avoid loading the entire file into the memory. However, due to the existence of various coding schemes, it is more challenging to read text files.

The limitations of the framework of the framework

Unfortunately, the .NET framework did not provide the function of the built -in reverse reading text file. To achieve this function, custom processing needs to be customized according to the encoding scheme used.

Custom solution

In order to solve this limit, we can implement our own custom solutions. The following code demonstrates a reverse text file reader, iterated files and generated in the reverse order:

Implement the details

public sealed class ReverseLineReader : IEnumerable<string>
{
    public ReverseLineReader(Func<Stream> streamSource, Encoding encoding) { }

    public IEnumerator<string> GetEnumerator() { }
}

This custom solution uses a variety of technologies to process long -coding and reverse processing files:

StreamFactory:

The constructor accepts a

commission, which provides a stream to read. This allows this class to be used for files and flow at the same time.

• Coding support: The reader supports single byte encoding, UTF-8 and Unicode encoding. ReverseLineReader Character detector: streamSource For the long-coding (UTF-8 and Unicode), the reader analyzes the byte mode to identify the starting position of each character.
• Increased iteration: Reverse processing flow of the reader, generate each line in an incremental amount to avoid loading the entire file into the memory.
• How to use
• Conclusion
Using the iterator to realize the limitations of the reverse text file reader. This custom solution can efficiently handle large -scale files, process various codes, and simplify operations similar to

in the Linux environment. However, it should be noted that reverse reading is slower than the positive reading speed because it requires additional analysis.

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