How does C determine if the contents of two files are the same

The hash algorithm generates a small binary "fingerprint" for each file. From a statistical point of view, it is impossible for different files to generate the same hash code

To generate a hash code, you must first create an HashAlgorithm object through the HashAlgorithm.Create method. And then call

The HashAlgorithm.ComputeHash method returns a byte array that stores the hash code, and then USES BitConverter.Tostring () to store it

Replace it with a string for comparison.

The source code is as follows:

public static bool isValidFileContent(string filePath1, string filePath2) 
       { 
           // create 1 Hash algorithm object  
           using (HashAlgorithm hash = HashAlgorithm.Create()) 
           { 
               using (FileStream file1 = new FileStream(filePath1, FileMode.Open),file2=new FileStream(filePath2,FileMode.Open)) 
               { 
                   byte[] hashByte1 = hash.ComputeHash(file1);// The hash algorithm gets the byte array of the hash code from the text  
                   byte[] hashByte2 = hash.ComputeHash(file2); 
                   string str1 = BitConverter.ToString(hashByte1);// Replaces the byte assembly with a string  
                   string str2 = BitConverter.ToString(hashByte2); 
                   return (str1==str2);// Compare hash codes  
               } 
           } 
       } 

The main function that USES this function

static void Main(string[] args) 
     { 
         string filePath1 = @"f:/1.txt"; 
         string filePath2 = @"f:/2.txt"; 
         bool valid=isValidFileContent(filePath1, filePath2); 
         Console.WriteLine(valid.ToString()); 
         Console.ReadKey(); 
     }