Now let’s create a method which compares two files by comparing their file sizes. Compare File Sizesīefore starting, we will be needing the System.IO namespace, so after you create a Windows Console Application from Visual Studio, add the namespace to the top of your main class file. Since both comparison techniques will be comparing file sizes we can start off by coding a CompareFileSizes method. Only files which have an identical size will be compared using the slower more accurate techniques number 4 and 5. We are going to use technique number 1 both times because it executes fast and can easily catch files of different sizes, therefore it can filter out the majority of files when doing comparisons. Then, finally, we will compare both file comparison techniques and select the better of the two. Then we are going to build another file comparison method which instead uses techniques 1 and 5 listed above. In this short series of articles, we are going to build an accurate file comparison tool which uses techniques 1 and 4 listed above. There is no one comparison technique which is good for all situations, so I recommend using multiple techniques in sequence. Technique number 3 for example, is very accurate but can be slow for large files. For example technique number 1 has the advantage of being very fast to execute, but then it is very unreliable because the chances of having files with the same size can be quite high. Generate a hash for each file and compare hashes Īll these comparison techniques have advantages and disadvantages.Compare bytes from beginning and end of files.Below is a list of some of the different techniques that can be used, either on their own, or together, to compare files. There are a number of different ways to compare files – some are good and some are not so good. Either way you will need to compare two files together, and I am going to show you how. As a developer you might need to compare files for equality, maybe because you want to verify that your backups are valid, or maybe because you want to search for duplicate files in a folder.
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