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Tip of the Day
Home » Tip Bank » .NET » C#
Language: .NET
Expertise: Beginner
Jun 22, 2016

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Building the Right Environment to Support AI, Machine Learning and Deep Learning


Reading a File Backwards Quickly in C#

The classes in .NET are structured to read files from the beginning to end. Hard drives are structured like that, sometimes though there is a dire need to read a file (commonly a large file) from the end up, just to see if there are new lines of data. This helps save a lot of memory as well as speed as opposed to reading a whole file into memory, simply to read the bottom five lines.

With the following code you can read a file backwards:

var lines = File.ReadAllLines(textFile).Reverse();


foreach (string line in lines)

{

// This will step through each line of the file, from the bottom to the top

}
Hannes du Preez
 
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