SelectedDirectoryEditor

using System;
using System.ComponentModel;
using System.Drawing.Design;
using System.Windows.Forms;

namespace Core.Windows.Forms {

    /// <summary>
    /// Custom impl of SelectedPathEditor
    /// Usages:
    /// [Editor(typeof(SelectedDirectoryEditor),typeof(UITypeEditor))]
    /// public string MyDirectory { get; set; }
    /// </summary>
    public class SelectedDirectoryEditor:UITypeEditor {

        public override object EditValue(ITypeDescriptorContext context,IServiceProvider provider,object value) {
            //uses standard folder browser dialog
            using(FolderBrowserDialog dialog = new FolderBrowserDialog()) {

                dialog.ShowNewFolderButton = true;


                //setup description
                if(context.PropertyDescriptor != null) {
                    if(!context.PropertyDescriptor.Description.IsNullOrEmptyTrim())
                        dialog.Description = context.PropertyDescriptor.Description;
                    else if(context.PropertyDescriptor.DisplayName.IsNullOrEmptyTrim())
                        dialog.Description = context.PropertyDescriptor.DisplayName;
                }

                if(dialog.Description.IsNullOrEmptyTrim())
                    dialog.Description = "Select a folder";


                string initialDirectory = value == null ? "" : value.ToString();

                if(initialDirectory.IsNullOrEmptyTrim()) {
                    dialog.RootFolder = Environment.SpecialFolder.MyDocuments;
                }
                else {
                    dialog.SelectedPath = initialDirectory;
                }

                //used when inheriting this component
                this.InitializeDialog(dialog,value);

                //show dialog
                if(dialog.ShowDialog(Form.ActiveForm) != DialogResult.OK) {

                    //return initial value
                    return value;
                }

                return dialog.SelectedPath;
            }
        }
        public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context) {
            return UITypeEditorEditStyle.Modal;
        }
        protected virtual void InitializeDialog(FolderBrowserDialog dialog,object value) {
        }
    }
}