计算器的C#实现

该计数器基本实现了加减乘除的运算

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Calculator
{
    public partial class Form1 : Form
    {
        public enum CalcuType
        {
            None
            /// 

            /// 加法
            /// 

            Addition
            /// 

            /// 减法
            /// 

            Substraction
            /// 

            /// 乘法
            /// 

            Multipication
            /// 

            /// 除法
            /// 

            Division
            /// 

            /// 乘方
            /// 

            Involution
            /// 

            /// 开方
            /// 

            Square
        }
        private double? _ValueF

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2020-04-27 09:24  Calculator\
     目录           0  2020-04-27 09:24  Calculator\.vs\
     目录           0  2020-04-27 09:24  Calculator\.vs\Calculator\
     目录           0  2020-04-27 09:24  Calculator\.vs\Calculator\v16\
     文件       50688  2020-04-16 17:14  Calculator\.vs\Calculator\v16\.suo
     目录           0  2020-04-27 09:24  Calculator\Calculator\
     文件        1135  2020-04-13 10:20  Calculator\Calculator.sln
     文件         189  2020-04-13 10:20  Calculator\Calculator\App.config
     目录           0  2020-04-27 09:24  Calculator\Calculator\bin\
     目录           0  2020-04-27 09:24  Calculator\Calculator\bin\Debug\
     文件       19456  2020-04-16 15:02  Calculator\Calculator\bin\Debug\Calculator.exe
     文件         189  2020-04-13 10:20  Calculator\Calculator\bin\Debug\Calculator.exe.config
     文件       40448  2020-04-16 15:02  Calculator\Calculator\bin\Debug\Calculator.pdb
     文件        3608  2020-04-13 15:35  Calculator\Calculator\Calculator.csproj
     文件        7685  2020-04-13 16:35  Calculator\Calculator\Form1.cs
     文件       22916  2020-04-13 16:01  Calculator\Calculator\Form1.Designer.cs
     文件        7653  2020-04-13 15:08  Calculator\Calculator\Form1.resx
     目录           0  2020-04-27 09:24  Calculator\Calculator\obj\
     目录           0  2020-04-27 09:24  Calculator\Calculator\obj\Debug\
     文件          42  2020-04-13 11:21  Calculator\Calculator\obj\Debug\Calculator.csproj.CoreCompileInputs.cache
     文件         815  2020-04-13 16:35  Calculator\Calculator\obj\Debug\Calculator.csproj.FileListAbsolute.txt
     文件        1012  2020-04-13 15:08  Calculator\Calculator\obj\Debug\Calculator.csproj.GenerateResource.cache
     文件       11625  2020-04-16 10:13  Calculator\Calculator\obj\Debug\Calculator.csprojAssemblyReference.cache
     文件       19456  2020-04-16 15:02  Calculator\Calculator\obj\Debug\Calculator.exe
     文件        1460  2020-04-16 15:02  Calculator\Calculator\obj\Debug\Calculator.Form1.resources
     文件       40448  2020-04-16 15:02  Calculator\Calculator\obj\Debug\Calculator.pdb
     文件         180  2020-04-16 15:02  Calculator\Calculator\obj\Debug\Calculator.Properties.Resources.resources
     文件        1435  2020-04-13 17:36  Calculator\Calculator\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        7168  2020-04-13 10:24  Calculator\Calculator\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     目录           0  2020-04-13 10:20  Calculator\Calculator\obj\Debug\TempPE\
     文件         522  2020-04-13 10:20  Calculator\Calculator\Program.cs
............此处省略6个文件信息