计算文件MD5码的工具

 1 using System.IO;
 2 using System.Security.Cryptography;
 3 using System.Text;
 4 
 5 
 6 /// <summary>
 7 /// 计算文件的MD5码
 8 /// </summary>
 9 public class ComputeFileMD5
10 {
11     #region 私有变量及属性
12 
13     /// <summary>
14     /// MD5对象
15     /// </summary>
16     private MD5 md5Obj;
17     /// <summary>
18     /// MD5属性
19     /// </summary>
20     private MD5 MD5Obj
21     {
22         get { return md5Obj ?? (md5Obj = MD5.Create()); }
23     }
24 
25     #endregion
26 
27     #region 私有方法
28 
29     /// <summary>
30     /// 计算一个字节数组的MD5码
31     /// </summary>
32     /// <param name="bytes">参与计算的字节数组</param>
33     /// <returns>结算获得的MD5码</returns>
34     private string ComputeHash(byte[] bytes)
35     {
36         if (null == bytes || bytes.Length <= 0)
37             return "";
38         byte[] hash = MD5Obj.ComputeHash(bytes);
39         StringBuilder sb = new StringBuilder();
40         foreach (var data in hash)
41         {
42             sb.Append(data.ToString("x2"));
43         }
44         return sb.ToString();
45     }
46 
47     /// <summary>
48     /// 将文件读取为字节数组
49     /// </summary>
50     /// <param name="filePath">文件路径</param>
51     /// <returns>字节数组读取结果</returns>
52     private byte[] ReadBytesFromFile(string filePath)
53     {
54         if (string.IsNullOrEmpty(filePath))
55             return null;
56 
57         return File.ReadAllBytes(filePath);
58     }
59 
60     #endregion
61 
62 
63     #region 公有方法
64 
65     /// <summary>
66     /// 计算文件的MD5码
67     /// </summary>
68     /// <param name="filePath">文件路径</param>
69     /// <returns>文件计算获得的MD5码</returns>
70     public string ComputeMD5(string filePath)
71     {
72         if (!File.Exists(filePath))
73             return "";
74         byte[] bytes = ReadBytesFromFile(filePath);
75         return null != bytes ? ComputeHash(bytes) : null;
76     }
77 
78     #endregion
79 }

测试用例:

 1 using System;
 2 
 3 namespace myMethod
 4 {
 5     class lgs
 6     {
 7         static void Main()
 8         {
 9             ComputeFileMD5 tool = new ComputeFileMD5();
10             string path = @"D:DOTween Pro 0.9.690.unitypackage";
11             string md5 = tool.ComputeMD5(path);
12             Console.WriteLine(md5);
13             Console.ReadKey();
14         }
15     }
16 }

输出结果: