1 //计算字符串MD5 2 public static string GetStringMd5(string txt)  3 {  4     MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();  5     string result = "";  6     byte[] bytes = Encoding.ASCII.GetBytes(txt);  7     byte[] cryptBytes = md5.ComputeHash(bytes);  8     foreach (byte item in cryptBytes)  9     { 10         result += item.ToString("X2"); 11     } 12     return result; 13 } 14  15 //计算文件MD516 public static string GetFileMd5(string path) 17 { 18     MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); 19     string result = ""; 20     using (FileStream fs = new FileStream(path, FileMode.Open)) 21     { 22         byte[] cryptBytes = md5.ComputeHash(fs); 23         foreach (byte item in cryptBytes) 24         { 25             result += item.ToString("X2"); 26         } 27         return result; 28     } 29 }

C#代码依旧简单易懂，不过是调用了一个类库而已，记录在这里留着日后用的时候Copy。其实可以利用这段代码写一个小工具计算MD5。