1 using System;
2 using System.IO;
3 using System.Security.Cryptography;
4 using System.Text;
5
6 namespace myMethod
7 {
8 class lgs
9 {
10 static void Main()
11 {
12 Console.ReadKey();
13 }
14
15 /// <summary>
16 /// 使用不同的编码格式将 字符串 → 字节数组
17 /// </summary>
18 /// <returns></returns>
19 static void StringToByteArray(string param, out byte[] result)
20 {
21 //result = Encoding.ASCII.GetBytes(param);
22 //result = Encoding.UTF32.GetBytes(param);
23 result = Encoding.UTF7.GetBytes(param);
24 }
25
26 /// <summary>
27 /// 使用不同的编码格式将 字节数组 → 字符串
28 /// </summary>
29 /// <returns></returns>
30 static void ByteArrayToString(byte[] param, out string result)
31 {
32 //result = Encoding.UTF7.GetString(param);
33 //result = Encoding.Default.GetString(param);
34 result = Encoding.ASCII.GetString(param);
35 }
36
37 /// <summary>
38 /// 字符串转换为流
39 /// </summary>
40 static void StringToStream(string param, out MemoryStream result)
41 {
42 byte[] tmpArray = Convert.FromBase64String(param); //相当于将字符串转换为等效的字节数组
43 result = new MemoryStream(tmpArray);
44 }
45
46 /// <summary>
47 /// 流转换了字符串
48 /// </summary>
49 static void StreamToString(MemoryStream param, out string result)
50 {
51 //方式一 :param.ToArray() 将流内容写入字节数组
52 result = Encoding.Default.GetString(param.ToArray());
53
54 //方式二:
55 result = Convert.ToBase64String(param.ToArray());
56 }
57
58 /// <summary>
59 /// 字节数组转换为流
60 /// </summary>
61 static void ByteArrayToStream(byte[] param, out MemoryStream result)
62 {
63 //方式一:
64 //result = new MemoryStream(param);
65
66 //方式二:
67 result = new MemoryStream();
68 result.Read(param, 0, param.Length);
69 }
70
71 /// <summary>
72 /// 流转换为字节数组
73 /// </summary>
74 static void SteamToByteArray(MemoryStream param, out byte[] result)
75 {
76 //方式一:
77 result = param.ToArray();
78
79 //方式二:
80 //param.Write(result, 0, (int)param.Length);
81 }
82
83 /// <summary>
84 /// 计算文件的 MD5 值
85 /// </summary>
86 /// <param name="fileName">要计算 MD5 值的文件名和路径</param>
87 /// <returns>MD5 值16进制字符串</returns>
88 static string MD5File(string fileName)
89 {
90 return HashFile(fileName, "md5");
91 }
92
93 /// <summary>
94 /// 计算文件的 sha1 值
95 /// </summary>
96 /// <param name="fileName">要计算 sha1 值的文件名和路径</param>
97 /// <returns>sha1 值16进制字符串</returns>
98 static string SHA1File(string fileName)
99 {
100 return HashFile(fileName, "sha1");
101 }
102
103 /// <summary>
104 /// 计算文件的哈希值
105 /// </summary>
106 /// <param name="fileName">要计算哈希值的文件名和路径</param>
107 /// <param name="algName">算法:sha1,md5</param>
108 /// <returns>哈希值16进制字符串</returns>
109 static string HashFile(string fileName, string algName)
110 {
111 if (!File.Exists(fileName))
112 return string.Empty;
113
114 FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
115 byte[] hashBytes = HashData(fs, algName);
116 fs.Close();
117 return ByteArrayToHexString(hashBytes);
118 }
119
120 /// <summary>
121 /// 计算哈希值
122 /// </summary>
123 /// <param name="stream">要计算哈希值的 Stream</param>
124 /// <param name="algName">算法:sha1,md5</param>
125 /// <returns>哈希值字节数组</returns>
126 static byte[] HashData(Stream stream, string algName)
127 {
128 HashAlgorithm algorithm;
129 if (algName == null)
130 {
131 throw new ArgumentNullException("algName 不能为 null");
132 }
133 if (string.Compare(algName, "sha1", true) == 0)
134 {
135 algorithm = SHA1.Create();
136 }
137 else
138 {
139 if (string.Compare(algName, "md5", true) != 0)
140 {
141 throw new Exception("algName 只能使用 sha1 或 md5");
142 }
143 algorithm = MD5.Create();
144 }
145 return algorithm.ComputeHash(stream);
146 }
147
148 /// <summary>
149 /// 字节数组转换为16进制表示的字符串
150 /// </summary>
151 static string ByteArrayToHexString(byte[] buf)
152 {
153 // ToString(buf) --- 由以连字符分隔的十六进制对构成的字符串，其中每一对表示 value 中对应的元素；例如“7F-2C-4A”。
154 return BitConverter.ToString(buf).Replace("-", "");
155 }
156 }
157 }
参考:https://www.oschina.net/code/snippet_2256220_53535