/// <summary>
/// Accepts two strings that represents two files to compare.
/// </summary>
/// <param name="filePath1">The file1.</param>
/// <param name="filePath2">The file2.</param>
/// <param name="bufferSize">The size of buffer.</param>
/// <param name="posOfFirstDiffByte">Position of the first diff byte or -1 if files are equal.</param>
/// <returns>Return true indicates that the contents of the files are the same. Return false if the files are different.</returns>
public static bool CompareFiles(string filePath1, string filePath2, int bufferSize, out long posOfFirstDiffByte)
{
posOfFirstDiffByte = -1;
// Determine if the same file was referenced two times.
if (0 == string.Compare(filePath1, filePath2, true))
{
// Return true to indicate that the files are the same.
return(true);
}
// If some of the files does not exists then assume they are different.
if (!(File.Exists(filePath1) && File.Exists(filePath2)))
{
return(false);
}
using (var stream1 = new FileStream(filePath1, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (var stream2 = new FileStream(filePath2, FileMode.Open, FileAccess.Read, FileShare.Read))
{
return(stream1.CompareTo(stream2, bufferSize, out posOfFirstDiffByte));
}
}
}
