C#对文件进行MD5值检测

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6 using System.ComponentModel;
  7 using System.Data;
  8 using System.Drawing;
  9 using System.IO;
 10 using System.Security.Cryptography;
 11 using System.Diagnostics;
 12 using System.ServiceProcess;
 13 
 14 namespace org.nipc.securityManager.client.UpdateModule
 15 {
 16     public  class MD5Check
 17     {
 18         //static void Main(string[] args)
 19         //{
 20             //string strMD5 = MD5File(@"C:\Users\Administrator\Desktop\my.docx");//读取升级包的MD5值
 21             //Console.WriteLine(strMD5);
 22             //Console.ReadKey();
 23 
 24             //Process[] ps = Process.GetProcesses();//停止老版本正在运行的进程
 25             //foreach (Process item in ps)
 26             //{
 27             //    if (item.ProcessName == "SecurityManagerClient")
 28             //    {
 29             //        item.Kill();
 30             //    }
 31             //}
 32 
 33             //object[] o = System.ServiceProcess.ServiceController.GetServices();
 34             //for (int i = 0; i < o.Length; i++)
 35             //{
 36             //    ((ServiceController[])o)[i].Start(); //启动服务
 37             //    bool stopYN = ((ServiceController[])o)[i].CanStop; //判断服务是否可以停止
 38             //    if (stopYN)
 39             //        ((ServiceController[])o)[i].Stop();//停止服务
 40             //}
 41 
 42             ////执行老软件的卸载程序
 43             //System.Diagnostics.Process.Start(@"C:\Users\Administrator\Desktop\SMSetup1.0.0.7.exe");//路径有待修改
 44 
 45             ////执行新软件的安装程序
 46             //System.Diagnostics.Process.Start(@"C:\Users\Administrator\Desktop\SMSetup1.0.0.7.exe");//路径有待修改
 47         //}
 48         /// <summary>
 49         /// 计算文件的 MD5 值
 50         /// </summary>
 51         /// <param name="fileName">要计算 MD5 值的文件名和路径</param>
 52         /// <returns>MD5 值16进制字符串</returns>
 53         public static string MD5File(string fileName)
 54         {
 55             return HashFile(fileName, "md5");
 56         }
 57 
 58         /// <summary>
 59         /// 计算文件的哈希值
 60         /// </summary>
 61         /// <param name="fileName">要计算哈希值的文件名和路径</param>
 62         /// <param name="algName">算法:sha1,md5</param>
 63         /// <returns>哈希值16进制字符串</returns>
 64         public static string HashFile(string fileName, string algName)
 65         {
 66             if (!System.IO.File.Exists(fileName))
 67                 return string.Empty;
 68 
 69             FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
 70             byte[] hashBytes = HashData(fs, algName);
 71             fs.Close();
 72             return ByteArrayToHexString(hashBytes);
 73         }
 74 
 75         /// <summary>
 76         /// 计算哈希值
 77         /// </summary>
 78         /// <param name="stream">要计算哈希值的 Stream</param>
 79         /// <param name="algName">算法:sha1,md5</param>
 80         /// <returns>哈希值字节数组</returns>
 81         public static byte[] HashData(Stream stream, string algName)
 82         {
 83             HashAlgorithm algorithm;
 84             if (algName == null)
 85             {
 86                 throw new ArgumentNullException("algName 不能为 null");
 87             }
 88             if (string.Compare(algName, "sha1", true) == 0)
 89             {
 90                 algorithm = SHA1.Create();
 91             }
 92             else
 93             {
 94                 if (string.Compare(algName, "md5", true) != 0)
 95                 {
 96                     throw new Exception("algName 只能使用 sha1 或 md5");
 97                 }
 98                 algorithm = MD5.Create();
 99             }
100             return algorithm.ComputeHash(stream);
101         }
102 
103         /// <summary>
104         /// 字节数组转换为16进制表示的字符串
105         /// </summary>
106         /// <param name="buf"></param>
107         /// <returns></returns>
108         public static string ByteArrayToHexString(byte[] buf)
109         {
110             string returnStr = "";
111             if (buf != null)
112             {
113                 for (int i = 0; i < buf.Length; i++)
114                 {
115                     returnStr += buf[i].ToString("X2");
116                 }
117             }
118             return returnStr;
119 
120         }
121 
122     }
123 }