C# .net custom control properties

The first step is to add a custom control: The second step is to right-click on the form to view the code or press F7: The third step is to add attributes:

You can also use the following code to achieve

 [Description("修改此值，可修改分割线的颜色"), Category("自定义属性")]
        // 控件的自定义属性值 
        public Color DrawLineColor                   
        {  
            get  
            {  
                return drawLineColor;  
            }  
            set  
            {  
                drawLineColor = value;    
                // 此处修改，为自定义属性变动时，执行的操作  
                // 此处当颜色值属性变动时，使用新的颜色，使自定义控件重绘 
                this.Invalidate();   
            }  
        }
        // 自定义事件的参数类型
        public delegate void select_Handle(object sender, EventArgs e, string orther);    
        [Description("当点击控件时发生，调用选中当前控件逻辑"), CateGory("自定义事件")]
        // 自定义事件名, 
        public event select_Handle ThisLine_Selected;                                       
  
        // 在当前控件的某个默认事件中调用自定义事件，此处使用默认的Click事件时，调用自定义的选中事件This_Selected  
        private void SplITLineHorizontal_Click(object sender, EventArgs e)  
        {
            // 定义选中控件时，显示为红色
            //DrawColor = Color.Red;     
            //调用自定义事件
            if (ThisLine_Selected != null) ThisLine_Selected(this, new EventArgs(), "其它参数");  
        }  
    }

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