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!
