/// <summary>
/// Checks if two file paths are identical.
/// </summary>
/// <param name="P1">Path 1</param>
/// <param name="P2">Path 2</param>
/// <remarks>
/// At least one file has to exist
/// </remarks>
/// <returns>true, if identical</returns>
public static bool ComparePath(string P1, string P2)
{
//Consider two null strings identical
if (P1 == null && P2 == null)
{
return(true);
}
//Throw if only one arg is null
if (P1 == null)
{
throw new ArgumentNullException("P1");
}
//Throw if only one arg is null
if (P2 == null)
{
throw new ArgumentNullException("P1");
}
//Consider Paths equal if strings are
if (P1 == P2)
{
return(true);
}
//Fail if both files don't exist
if (!File.Exists(P1) && !File.Exists(P2))
{
throw new ArgumentException("At least one argument needs to point to an existing file");
}
//Consider Paths unequal if one of the files doesn't exists
if (!File.Exists(P1) || !File.Exists(P2))
{
return(false);
}
using (SafeFileHandle sfh1 = CreateFile(P1, FileAccess.Read, FileShare.ReadWrite, IntPtr.Zero, FileMode.Open, (FileAttributes)0x02000080, IntPtr.Zero))
{
if (sfh1.IsInvalid)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
using (SafeFileHandle sfh2 = CreateFile(P2, FileAccess.Read, FileShare.ReadWrite, IntPtr.Zero, FileMode.Open, (FileAttributes)0x02000080, IntPtr.Zero))
{
if (sfh2.IsInvalid)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
var fileInfo1 = new BY_HANDLE_FILE_INFORMATION();
var fileInfo2 = new BY_HANDLE_FILE_INFORMATION();
if (!GetFileInformationByHandle(sfh1, out fileInfo1))
{
throw new Win32Exception();
}
if (!GetFileInformationByHandle(sfh2, out fileInfo2))
{
throw new Win32Exception();
}
return(fileInfo1.FileEquals(fileInfo2));
}
}
}