.NET Map Drive in C# (WPF)

Complete class reference updated for WPF (not yet tested). For backwards compatibility, previous Win32 code maintained in code comments (and just replace ‘Window’ with ‘Form’).

    /// <summary>
    /// Network drive interface from original application slightly modified to handle WPF windows.
    /// </summary>
    public class NetworkDrive
    {

        #region API
        [DllImport("mpr.dll")]
        private static extern int WNetAddConnection2A(ref structNetResource pstNetRes, string psPassword, string psUsername, int piFlags);
        [DllImport("mpr.dll")]
        private static extern int WNetCancelConnection2A(string psName, int piFlags, int pfForce);
        [DllImport("mpr.dll")]
        private static extern int WNetConnectionDialog(int phWnd, int piType);
        [DllImport("mpr.dll")]
        private static extern int WNetDisconnectDialog(int phWnd, int piType);
        [DllImport("mpr.dll")]
        private static extern int WNetRestoreConnectionW(int phWnd, string psLocalDrive);

        [StructLayout(LayoutKind.Sequential)]
        private struct structNetResource
        {
            public int iScope;
            public int iType;
            public int iDisplayType;
            public int iUsage;
            public string sLocalName;
            public string sRemoteName;
            public string sComment;
            public string sProvider;
        }

        private const int RESOURCETYPE_DISK = 0x1;

        //Standard	
        private const int CONNECT_INTERACTIVE = 0x00000008;
        private const int CONNECT_PROMPT = 0x00000010;
        private const int CONNECT_UPDATE_PROFILE = 0x00000001;
        //IE4+
        private const int CONNECT_REDIRECT = 0x00000080;
        //NT5 only
        private const int CONNECT_COMMANDLINE = 0x00000800;
        private const int CONNECT_CMD_SAVECRED = 0x00001000;

        #endregion

        #region Propertys and options
        private bool lf_SaveCredentials = false;
        /// <summary>
        /// Option to save credentials are reconnection...
        /// </summary>
        public bool SaveCredentials
        {
            get { return (lf_SaveCredentials); }
            set { lf_SaveCredentials = value; }
        }
        private bool lf_Persistent = false;
        /// <summary>
        /// Option to reconnect drive after log off / reboot ...
        /// </summary>
        public bool Persistent
        {
            get { return (lf_Persistent); }
            set { lf_Persistent = value; }
        }
        private bool lf_Force = false;
        /// <summary>
        /// Option to force connection if drive is already mapped...
        /// or force disconnection if network path is not responding...
        /// </summary>
        public bool Force
        {
            get { return (lf_Force); }
            set { lf_Force = value; }
        }
        private bool ls_PromptForCredentials = false;
        /// <summary>
        /// Option to prompt for user credintals when mapping a drive
        /// </summary>
        public bool PromptForCredentials
        {
            get { return (ls_PromptForCredentials); }
            set { ls_PromptForCredentials = value; }
        }

        private string ls_Drive = "s:";
        /// <summary>
        /// Drive to be used in mapping / unmapping...
        /// </summary>
        public string LocalDrive
        {
            get { return (ls_Drive); }
            set
            {
                if (value.Length >= 1)
                {
                    ls_Drive = value.Substring(0, 1) + ":";
                }
                else
                {
                    ls_Drive = "";
                }
            }
        }
        private string ls_ShareName = "\\\\Computer\\C$";
        /// <summary>
        /// Share address to map drive to.
        /// </summary>
        public string ShareName
        {
            get { return (ls_ShareName); }
            set { ls_ShareName = value; }
        }
        #endregion

        #region Function mapping
        /// <summary>
        /// Map network drive
        /// </summary>
        public void MapDrive() { zMapDrive(null, null); }
        /// <summary>
        /// Map network drive (using supplied Password)
        /// </summary>
        public void MapDrive(string Password) { zMapDrive(null, Password); }
        /// <summary>
        /// Map network drive (using supplied Username and Password)
        /// </summary>
        public void MapDrive(string Username, string Password) { zMapDrive(Username, Password); }
        /// <summary>
        /// Unmap network drive
        /// </summary>
        public void UnMapDrive() { zUnMapDrive(this.lf_Force); }
        /// <summary>
        /// Check / restore persistent network drive
        /// </summary>
        public void RestoreDrives() { zRestoreDrive(); }
        /// <summary>
        /// Display windows dialog for mapping a network drive
        /// </summary>
        public void ShowConnectDialog(Window ParentForm) { zDisplayDialog(ParentForm, 1); }
        /// <summary>
        /// Display windows dialog for disconnecting a network drive
        /// </summary>
        public void ShowDisconnectDialog(Window ParentForm) { zDisplayDialog(ParentForm, 2); }


        #endregion

        #region Core functions

        // Map network drive
        private void zMapDrive(string psUsername, string psPassword)
        {
            //create struct data
            structNetResource stNetRes = new structNetResource();
            stNetRes.iScope = 2;
            stNetRes.iType = RESOURCETYPE_DISK;
            stNetRes.iDisplayType = 3;
            stNetRes.iUsage = 1;
            stNetRes.sRemoteName = ls_ShareName;
            stNetRes.sLocalName = ls_Drive;
            //prepare params
            int iFlags = 0;
            if (lf_SaveCredentials) { iFlags += CONNECT_CMD_SAVECRED; }
            if (lf_Persistent) { iFlags += CONNECT_UPDATE_PROFILE; }
            if (ls_PromptForCredentials) { iFlags += CONNECT_INTERACTIVE + CONNECT_PROMPT; }
            if (psUsername == "") { psUsername = null; }
            if (psPassword == "") { psPassword = null; }
            //if force, unmap ready for new connection
            if (lf_Force)
            {
                try { zUnMapDrive(true); }
                catch { }
            }
            //call and return
            int i = WNetAddConnection2A(ref stNetRes, psPassword, psUsername, iFlags);
            if (i > 0) { throw new System.ComponentModel.Win32Exception(i); }
        }


        // Unmap network drive	
        private void zUnMapDrive(bool pfForce)
        {
            //call unmap and return
            int iFlags = 0;
            if (lf_Persistent) { iFlags += CONNECT_UPDATE_PROFILE; }
            int i = WNetCancelConnection2A(ls_Drive, iFlags, Convert.ToInt32(pfForce));
            if (i != 0) i = WNetCancelConnection2A(ls_ShareName, iFlags, Convert.ToInt32(pfForce));  //disconnect if localname was null
            if (i > 0) { throw new System.ComponentModel.Win32Exception(i); }
        }


        // Check / Restore a network drive
        private void zRestoreDrive()
        {
            //call restore and return
            int i = WNetRestoreConnectionW(0, null);
            if (i > 0) { throw new System.ComponentModel.Win32Exception(i); }
        }

        // Display windows dialog
        private void zDisplayDialog(Window poParentForm, int piDialog)
        {
            int i = -1;
            int iHandle = 0;
            //get parent handle
            if (poParentForm != null)
            {

                IntPtr hwnd = (new WindowInteropHelper(poParentForm)).Handle;
                iHandle = hwnd.ToInt32(); //poParentForm.Handle.ToInt32();
            }
            //show dialog
            if (piDialog == 1)
            {
                i = WNetConnectionDialog(iHandle, RESOURCETYPE_DISK);
            }
            else if (piDialog == 2)
            {
                i = WNetDisconnectDialog(iHandle, RESOURCETYPE_DISK);
            }
            if (i > 0) { throw new System.ComponentModel.Win32Exception(i); }
            //set focus on parent form
            //poParentForm.BringToFront();
            poParentForm.Activate();
            poParentForm.Topmost = true;
        }
        #endregion

    }

References
StackOverflow (blog), http://stackoverflow.com/questions/3465182/how-to-map-a-drive-using-c
PINVOKE (code references and snippets), http://pinvoke.net/default.aspx/Structures/NETRESOURCE.html
MSDN (info on class types and structures), http://msdn.microsoft.com/en-us/library/windows/desktop/aa385341%28v=vs.85%29.aspx

About Ronnie Diaz

Ronnie Diaz is a software engineer and tech consultant. Ronnie started his career in front-end and back-end development for companies in ecommerce, service industries and remote education. This work transitioned from traditional desktop client-server applications through early cloud development. Software included human resource management and service technician workflows, online retail e-commerce and electronic ordering and fulfillment, IVR customer relational systems, and video streaming remote learning SCORM web applications. Hands on server experience and software performance optimization led to creation of a startup business focused on collocated data center services and continued experience with video streaming hardware and software. This led to a career in Amazon Prime Video where Ronnie is currently employed, building software and systems which stream live sports and events for millions of viewers around the world.

Posted on July 11, 2012, in Programming & Development and tagged , , , , , , , , , , . Bookmark the permalink. Leave a comment.

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