自定义控件

   [Description("设置执行程序")]　//显示在属性设计视图中的描述
    [Editor(typeof(MyEditor), typeof(UITypeEditor))]
    public string SelectExe
    {
        get
        { return selectExe; }
        set
        {
           
            if (File.Exists(value))
            {
                picExeImg.Image = GetIconByFileName(value, true).ToBitmap();
                lblExeName.Text = Path.GetFileName(value);
            }
                selectExe = value;
                picExeImg.Tag = value;                                 
        }
    }


    public class MyEditor : UITypeEditor
    {
        private IWindowsFormsEditorService editorService = null;

        public override UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
        {
            return UITypeEditorEditStyle.Modal;
        }

        public override object EditValue(
            ITypeDescriptorContext context,
            IServiceProvider provider,
            object value)
        {
            if (provider != null)
            {
                editorService =
                    provider.GetService(typeof(IWindowsFormsEditorService))
                    as IWindowsFormsEditorService;
            }

            if (editorService != null)
            {
                OpenFileDialog ofd = new OpenFileDialog();
                ofd.Title = "请选择执行程序";
                ofd.Filter = "可执行文件 (*.exe)|*.exe";
                ofd.FileName = value.ToString();
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    value = ofd.FileName;

                }
            }
            return value;
        }

        public override bool GetPaintValueSupported(
            ITypeDescriptorContext context)
        {
            return false;
            //return true;
        }


        public override void PaintValue(PaintValueEventArgs e)
        {
            //TODO:
        }


    }