cs窗体继承问题界面打不开和添加自定义控件设计器报错

父窗体

必须要有无参构造构造函数

load方法里

 if (!DesignMode)  //是否是设计模式
            {
                Init();
            }

if (!(GetService(typeof(IDesignerHost)) != null || LicenseManager.UsageMode == LicenseUsageMode.Designtime) || !this.DesignMode)
            {
                Init();
            }

 

 

子窗体

//public frmBaseFastInputWeight() : base()
        //{
        //    InitializeComponent();
        //}

        public frmBaseFastInputWeight(FastInputViewModel fastInputViewModel)
            : base(fastInputViewModel)
        {
            InitializeComponent();
            _fastInputViewModel = fastInputViewModel;
        }

 添加自定义控件设计器报错

if (DesignMode || !IsHandleCreated) return;