请教一个关于Form继承的问题
用C#做一个outlook插件 新建一个Outlook Form Region 让其继承System.Windows.Forms.Form 时报错
Error1Partial declarations of 'OutlookAddInTest.LabelForm' must not specify different base classes

哪位可以帮助下

代码如下

namespace OutlookAddInTest
{
    public partial class LabelForm : Form
    {

       private RibbonTest ribbon = null;


       public LabelForm() {

           InitializeComponent();
           
       }
       public LabelForm(RibbonTest ribbon)
       {
           InitializeComponent();
           this.ribbon = ribbon;
       }

       protected override void OnLoad(EventArgs e)
       {
           base.OnLoad(e);
       }
        // Occurs before the form region is displayed.
        // Use this.OutlookItem to get a reference to the current Outlook item.
        // Use this.OutlookFormRegion to get a reference to the form region.
        private void LabelForm_FormRegionShowing(object sender, System.EventArgs e)
        {
        }

        // Occurs when the form region is closed.
        // Use this.OutlookItem to get a reference to the current Outlook item.
        // Use this.OutlookFormRegion to get a reference to the form region.
        private void LabelForm_FormRegionClosed(object sender, System.EventArgs e)
        {
        }
       
    }
}

[解决办法]
看错误的意思，LabelForm已经在别处指定了base class而且不是Form，所以报错的