计算C#中文件内容的哈希值? [英] Calculate the Hash of the Contents of a File in C#?

问题描述

我需要计算C#中文件内容的哈希值吗?因此，我可以在我的应用程序中比较两个文件哈希.我有搜索但没有找到.

I need to calculate the Hash of the Contents of a File in C#? So, that I can compare two file hashes in my app. I have search but not found.

推荐答案

您可以使用 MD5CryptoServiceProvider ，它将与基于文本的文件以及二进制文件一起使用.

You could use MD5CryptoServiceProvider, which will work with text based files as well as binary files.

byte[] myFileData = File.ReadAllBytes(myFileName);
byte[] myHash = MD5.Create().ComputeHash(myFileData);

或者...如果您使用大型文件，并且不想将整个文件加载到内存中，则:

Or... if you work with large files and do not want to load the whole file into memory:

byte[] myHash;
using (var md5 = MD5.Create())
using (var stream = File.OpenRead(myFileName))
    myHash = md5.ComputeHash(stream);

您可以使用 Enumerable.SequenceEqual 与两个文件的字节数组进行比较:

You can compare to byte arrays from two files with Enumerable.SequenceEqual:

myHash1.SequenceEqual(myHash2); 

您还可以尝试创建CRC计算器.请参阅: http://damieng.com/blog/2006/08/08/calculating_crc32_in_c_and_net

You could also try to create an CRC-calculator. See: http://damieng.com/blog/2006/08/08/calculating_crc32_in_c_and_net

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