Compress a folder using NTFS compression in .NET

Question

I want to compress a folder using NTFS compression in .NET. I found this post, but it does not work. It throws an exception (\"Invalid Parameter\").

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Answer 1

I have tested the code and it !

• Make sure it works for you with the gui. Maybe the allocation unit size is too big for compression. Or you don't have sufficient permissions.
• For your destination use format like so: "c:/temp/testcomp" with forward slashes.

Full code:

using System.IO;
using System.Management;

class Program
{
    static void Main(string[] args)
    {
        string destinationDir = "c:/temp/testcomp";
        DirectoryInfo directoryInfo = new DirectoryInfo(destinationDir);
        if ((directoryInfo.Attributes & FileAttributes.Compressed) != FileAttributes.Compressed)
        {
            string objPath = "Win32_Directory.Name=" + "\"" + destinationDir + "\"";
            using (ManagementObject dir = new ManagementObject(objPath))
            {
                ManagementBaseObject outParams = dir.InvokeMethod("Compress", null, null);
                uint ret = (uint)(outParams.Properties["ReturnValue"].Value);
            }
        }
     }
}