.net WinForm用户控件开发--(7)用户控件下拉式属性设置

这一节我们共同学习下用户控件的下拉式属性设置，可以为用户控件设置属性以下拉框的形式显示出来，效果图如下

这里我们定义一个用户控件，设置一个属性DropDownPropery

代码如下

[csharp]
public partial class UCLab : UserControl
{
      public UCLab()
      {
          InitializeComponent();
      }



      private string dropdownPropery="Hello";
      [Description("下拉属性")]
      [Editor(typeof(DropTypeDialogEditor),typeof(UITypeEditor))]
      public string DropDownPropery
      {
          get
          {
              return dropdownPropery;
          }
          set
          {
              dropdownPropery = value;
          }
      }


}

public partial class UCLab : UserControl
    {
        public UCLab()
        {
            InitializeComponent();
        }

        private string dropdownPropery="Hello";
        [Description("下拉属性")]
        [Editor(typeof(DropTypeDialogEditor),typeof(UITypeEditor))]
        public string DropDownPropery
        {
            get
            {
                return dropdownPropery;
            }
            set
            {
                dropdownPropery = value;
            }
        }

    }
    接着我们该属性设置一个下拉式编辑器，代码如下

[csharp]
/// <summary>
   /// 下拉式编辑器
   /// </summary>
   public class DropTypeDialogEditor:UITypeEditor
   {
       public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
       {
           if (context!=null&&context.Instance!=null)
           {
               return UITypeEditorEditStyle.DropDown;//显示下拉箭头
           }
           return base.GetEditStyle(context);
       }

       public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
       {
           System.Windows.Forms.Design.IWindowsFormsEditorService editorService = null;
           if (context!=null&&context.Instance!=null&&provider!=null)
           {
               editorService = (System.Windows.Forms.Design.IWindowsFormsEditorService)provider.GetService(typeof(System.Windows.Forms.Design.IWindowsFormsEditorService));
               if (editorService!=null)
               {
                   UCLab lab =(UCLab)context.Instance;
                   UCDrop drop = new UCDrop(lab.DropDownPropery);
                   editorService.DropDownControl(drop);
                   value = drop.Result;
                   return value;
               }

           }
           //return base.EditValue(context, provider, value);
           return value;
       }

   }

/// <summary>
    /// 下拉式编辑器
    /// </summary>
    public class DropTypeDialogEditor:UITypeEditor
    {
        public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
        {
            if (context!=null&&context.Instance!=null)
            {
                return UITypeEditorEditStyle.DropDown;//显示下拉箭头
            }
            return base.GetEditStyle(context);
      &n

补充：Web开发 , ASP.Net ,