c#制作的计算器

c#代码制作的建议计算器usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Windows.Forms;namespace计算器{publicpartialclassForm1:Form{publicForm1(){I