这是我目前正在使用的例行程序。

  using System.Security.Cryptography; public string HashFile(string filePath) { using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read)) { return HashFile(fs); } } public string HashFile( FileStream stream ) { StringBuilder sb = new StringBuilder(); if( stream != null ) { stream.Seek( 0, SeekOrigin.Begin ); MD5 md5 = MD5CryptoServiceProvider.Create(); byte[] hash = md5.ComputeHash( stream ); foreach( byte b in hash ) sb.Append( b.ToString( "x2" ) ); stream.Seek( 0, SeekOrigin.Begin ); } return sb.ToString(); } 

精炼到位。 filename是您的文本文件的名称：

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 using (var md5 = MD5.Create()) { return BitConverter.ToString(md5.ComputeHash(File.ReadAllBytes(filename))).Replace("-", ""); } 

 internal static string GetHashCode(string filePath, HashAlgorithm cryptoService) { // create or use the instance of the crypto service provider // this can be either MD5, SHA1, SHA256, SHA384 or SHA512 using (cryptoService) { using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) { var hash = cryptoService.ComputeHash(fileStream); var hashString = Convert.ToBase64String(hash); return hashString.TrimEnd('='); } } } WriteLine("MD5 Hash Code : {0}", GetHashCode(FilePath, new MD5CryptoServiceProvider())); WriteLine("SHA1 Hash Code : {0}", GetHashCode(FilePath, new SHA1CryptoServiceProvider())); WriteLine("SHA256 Hash Code: {0}", GetHashCode(FilePath, new SHA256CryptoServiceProvider())); WriteLine("SHA384 Hash Code: {0}", GetHashCode(FilePath, new SHA384CryptoServiceProvider())); WriteLine("SHA512 Hash Code: {0}", GetHashCode(FilePath, new SHA512CryptoServiceProvider()));