如何使用 .NET 快速比较 2 个文件? [英] How to compare 2 files fast using .NET?

问题描述

典型方法建议通过 FileStream 读取二进制文件并逐字节比较.

Typical approaches recommend reading the binary via FileStream and comparing it byte-by-byte.

• 校验和比较(例如 CRC)会更快吗?
• 是否有任何 .NET 库可以为文件生成校验和?

推荐答案

校验和比较很可能比逐字节比较慢.

A checksum comparison will most likely be slower than a byte-by-byte comparison.

为了生成校验和，您需要加载文件的每个字节，并对其进行处理.然后，您必须对第二个文件执行此操作.处理几乎肯定会比比较检查慢.

In order to generate a checksum, you'll need to load each byte of the file, and perform processing on it. You'll then have to do this on the second file. The processing will almost definitely be slower than the comparison check.

至于生成校验和:您可以使用密码学类轻松完成此操作.这是一个使用 C# 生成 MD5 校验和的简短示例.

As for generating a checksum: You can do this easily with the cryptography classes. Here's a short example of generating an MD5 checksum with C#.

但是，如果您可以预先计算测试"或基本"情况的校验和，则校验和可能会更快并且更有意义.如果您有一个现有文件，并且您正在检查新文件是否与现有文件相同，则预先计算现有"文件的校验和意味着只需要执行一次 DiskIO，在新文件.这可能比逐字节比较要快.

However, a checksum may be faster and make more sense if you can pre-compute the checksum of the "test" or "base" case. If you have an existing file, and you're checking to see if a new file is the same as the existing one, pre-computing the checksum on your "existing" file would mean only needing to do the DiskIO one time, on the new file. This would likely be faster than a byte-by-byte comparison.

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