Handling disk full errors when copying files in C#

This function provides detailed information about the total, free, and available space on a specified disk or network location.

How to use PInvoke to call the GetDiskFreeSpaceEx function from the kernel32.dll library to check whether there is enough free space on a remote network drive before copying a file.

// PInvoke to GetDiskFreeSpaceEx function from kernel32.dll
[DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
static extern bool GetDiskFreeSpaceEx(
  string lpDirectoryName, 
  out ulong lpFreeBytesAvailable, // Free space available to the current user
  out ulong lpTotalNumberOfBytes, // Total space on the disk
  out ulong lpTotalNumberOfFreeBytes); // Total free space on the disk

// Method to check if there is enough space to copy the file
bool HasEnoughSpace(string srcFile, string destPath) {
  var fileBytes = (ulong)(new FileInfo(srcFile).Length);
  GetDiskFreeSpaceEx(destPath, out var availableBytes, out _, out _);
  return fileBytes <= availableBytes;
}

 // Example usage of the HasEnoughSpace method
if (!HasEnoughSpace(@"C:\MyFile.txt", @"\\127.0.0.1\C$")) {
      Console.WriteLine("Not enough space available. Please clear some space.");
      // You can add additional code to handle the situation
}

GetDiskFreeSpaceEx is declared using the DllImport attribute to import the unmanaged function from kernel32.dll. This allows your C# code to call the Windows API function for disk space querying.

This solution is a good approach to handling disk full errors when copying files to both local and network locations in C#.