1 using System;
2 using System.Text;
3 using System.IO;
4 using System.Security.Cryptography;
5
6 static void Main(string[] args)
7 {
8 CompareFileGetBytes("lyf.txt");
9 Console.ReadLine();
10 }
11
12 static void CompareFileGetBytes(string fileFullName)
13 {
14 byte[] fileReadAllBytes = File.ReadAllBytes(fileFullName);
15 string fileReadAllBytesMd5 = GetBytesMd5(fileReadAllBytes);
16
17 string utf8Md5 = string.Empty;
18 using (StreamReader reader = new StreamReader(fileFullName))
19 {
20 string textResult = reader.ReadToEnd();
21 byte[] utf8Bytes = Encoding.UTF8.GetBytes(textResult);
22 utf8Md5 = GetBytesMd5(utf8Bytes);
23 }
24
25 string utf32Md5 = string.Empty;
26 using (StreamReader utf32Reader = new StreamReader(fileFullName))
27 {
28 string textResult = utf32Reader.ReadToEnd();
29 byte[] utf32Bytes = Encoding.UTF32.GetBytes(textResult);
30 utf32Md5 = GetBytesMd5(utf32Bytes);
31 }
32
33
34 Console.WriteLine($"fileReadAllBytesMd5:{fileReadAllBytesMd5},utf8Md5:{utf8Md5}");
35
36 if (string.Equals(fileReadAllBytesMd5, utf8Md5))
37 {
38 Console.WriteLine($"{nameof(fileReadAllBytesMd5)} is equal with {nameof(utf8Md5)}!");
39 }
40 else
41 {
42 Console.WriteLine($"{nameof(fileReadAllBytesMd5)} is not equal with {nameof(utf8Md5)}!");
43 }
44
45 Console.WriteLine($"utf8Md5:{utf8Md5},utf32Md5:{utf32Md5}");
46 if (string.Equals(utf8Md5, utf32Md5))
47 {
48 Console.WriteLine($"{nameof(utf8Md5)} is equals with {nameof(utf32Md5)}");
49 }
50 else
51 {
52 Console.WriteLine($"{nameof(utf8Md5)} is not equals with {nameof(utf32Md5)}");
53 }
54 }
55
56 static string GetBytesMd5(byte[] bytesData)
57 {
58 StringBuilder md5Builder = new StringBuilder();
59 using(MD5CryptoServiceProvider md5=new MD5CryptoServiceProvider())
60 {
61 byte[] md5Bytes = md5.ComputeHash(bytesData);
62 for(int i=0;i<md5Bytes.Length;i++)
63 {
64 md5Builder.Append(md5Bytes[i].ToString("x2"));
65 }
66 }
67 return md5Builder.ToString();
68 }
I had validated that different encoding mode can generate different result,they are not identical.
Besides,the File.ReadAllBytes may based on UTF8 because they render the identical result!
来源：https://www.cnblogs.com/Fred1987/archive/2020/01/01/12129976.html