Really Custom OpenFileDialog .NET

Question

I want to have an custom OpenFileDialog form within my project where I can add/remove buttons and customize whatever I want like a normal form. This is mainly so that it fits into the theme I am using, additionally, I can add custom buttons. Is there any tutorials on how I could construct my own? Are there any pre-existing projects I can use straight out of the download?

Answer 1

I hope that will fit your requirements:

You will need one TreeView and an ImageList

Code

You will need System.Runtime.InteropServices;

And following code to get the associated icon from the path:

    [StructLayout(LayoutKind.Sequential)]
    public struct SHFILEINFO
    {
        public IntPtr hIcon;
        public IntPtr iIcon;
        public uint dwAttributes;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
        public string szDisplayName;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
        public string szTypeName;
    };

    class Win32
    {
        public const uint SHGFI_ICON = 0x100;
        public const uint SHGFI_LARGEICON = 0x0;    // 'Large icon
        public const uint SHGFI_SMALLICON = 0x1;    // 'Small icon

        [DllImport("shell32.dll")]
        public static extern IntPtr SHGetFileInfo(string pszPath,
                                    uint dwFileAttributes,
                                    ref SHFILEINFO psfi,
                                    uint cbSizeFileInfo,
                                    uint uFlags);
    }

    private int GetIconOfFile_Folder(string Path)
    {
        IntPtr hImgSmall;    //the handle to the system image list
        IntPtr hImgLarge;    //the handle to the system image list
        string fName;        // 'the file name to get icon from
        SHFILEINFO shinfo = new SHFILEINFO();

        //Use this to get the small Icon
        hImgSmall = Win32.SHGetFileInfo(Path, 0, ref shinfo,
                                       (uint)Marshal.SizeOf(shinfo),
                                        Win32.SHGFI_ICON |
                                        Win32.SHGFI_SMALLICON);

        //Use this to get the large Icon
        //hImgLarge = SHGetFileInfo(fName, 0,
        //ref shinfo, (uint)Marshal.SizeOf(shinfo),
        //Win32.SHGFI_ICON | Win32.SHGFI_LARGEICON);
        //The icon is returned in the hIcon member of the shinfo
        //struct
        System.Drawing.Icon myIcon =
               System.Drawing.Icon.FromHandle(shinfo.hIcon);

        imageList1.Images.Add(myIcon);

        return imageList1.Images.Count - 1;
    }

Use following Method to Get all your Drives (best place it in your constructor/Form_Load):

    private void GetAllDrives()
    {
        DriveInfo[] drives = DriveInfo.GetDrives();
        foreach (var drive in drives)
        {
            TreeNode rootTreeNode = new TreeNode();
            rootTreeNode.Text = drive.Name;
            rootTreeNode.Tag = drive.Name;
            rootTreeNode.ImageIndex = GetIconOfFile_Folder(drive.Name);
            rootTreeNode.SelectedImageIndex = rootTreeNode.ImageIndex;
            rootTreeNode.Nodes.Add(" "); //Placeholder to enable expanding (+)
            treeView1.Nodes.Add(rootTreeNode);
        }
    }

Then you will need an EventHandler for the Expand-Event, which will call the method GetFilesAndFolder()

    private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
    {
        e.Node.Nodes.Clear();
        GetFilesAndFolder(e.Node, (string)e.Node.Tag);
    }

    private void GetFilesAndFolder(TreeNode tn, string Path)
    {
        try
        {
            string[] Directories = Directory.GetDirectories(Path);
            string[] Files = Directory.GetFiles(Path);

            foreach (string dir in Directories)
            {
                TreeNode dirTreeNode = new TreeNode();
                dirTreeNode.Tag = dir;
                dirTreeNode.Text = new DirectoryInfo(dir).Name;
                dirTreeNode.ImageIndex = GetIconOfFile_Folder(dir);
                dirTreeNode.SelectedImageIndex = dirTreeNode.ImageIndex;
                dirTreeNode.Nodes.Add(" ");
                tn.Nodes.Add(dirTreeNode);
            }

            foreach (string file in Files)
            {
                TreeNode fileTreeNode = new TreeNode();
                fileTreeNode.Tag = file;
                fileTreeNode.Text = new FileInfo(file).Name;
                fileTreeNode.ImageIndex = GetIconOfFile_Folder(file);
                fileTreeNode.SelectedImageIndex = fileTreeNode.ImageIndex;
                tn.Nodes.Add(fileTreeNode);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, ex.Source, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        }
    }

Finally I have created an EventHandler for the NodeDoubleClick-Event in the TreeView:

    private void treeView1_NodeMouseDoubleClick(object sender,                 TreeNodeMouseClickEventArgs e)
    {
        if (CheckIfPathIsFile(e.Node.Tag.ToString()) == true) //If the Tag (Path) is a File
        {
            //Do something with the Path (close this Form + return Path)
        }
    }

    private bool CheckIfPathIsFile(string Path)
    {
        // get the file attributes for file or directory
        FileAttributes attr = File.GetAttributes(Path);

        //detect whether its a directory or file
        if ((attr & FileAttributes.Directory) == FileAttributes.Directory)
            return false;
        else
            return true;
    }