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   源码介绍

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----------  ClassCalculator（计算器）  ----------

//----------  ClassCalculator（计算器）  ----------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsDemo01
{
    class ClassCalculator
    {
        public int star = 3; //状态
        private static double TextA;     //第一个数
        private static double TextB;     //第二个数
        private static double TextC;     //计算结果
        private static string numDisplay;   //显示结果
        //--------------------------------------------------------

        /// <summary>
        /// 计算器_验证
        /// </summary>
        /// <param name="txtA">输入框1</param>
        /// <param name="txtB">输入框1</param>
        /// <param name="count">运算符号</param>
        /// <returns></returns>
        public string Verify(string txtA, string txtB, int count)
        {
            if (txtA == string.Empty || txtB == string.Empty)
            {
                star = 2;
                return "第一(或二)个数字为空！";
            }
            if (count == 4)
            {
                star = 2;
                return "未选择运算符！";
            }
            try
            {
                TextA = Double.Parse(txtA);
                TextB = Double.Parse(txtB);
            }
            catch (Exception e)
            {
                star = 2;
                return "请输入数字";
            }
            if (TextB == 0 && count == 3)
            {
                star = 1;
                //Txt1.Text = "";
                return "除数不能为0，请重新输入！";
            }
            //MessageBox.Show(TextA.ToString()   ","   TextB.ToString(), "提示");
            //验证完成后计算

            star = 0;

            return Count(TextA, TextB, count);
        }

        /// <summary>
        /// 计算
        /// </summary>
        /// <param name="TextA">第一位</param>
        /// <param name="TextB">第二位</param>
        /// <param name="count">运算符号</param>
        /// <returns>结果</returns>
        public string Count(double TextA, double TextB, int count)
        {
            //初始化
            //Initialize();
            if (count == 0)
            {
                TextC = TextA   TextB;
                numDisplay = TextA   "＋"   TextB   "="   TextC;
            }
            if (count == 1)
            {
                TextC = TextA - TextB;
                numDisplay = TextA   "－"   TextB   "="   TextC;
            }
            if (count == 2)
            {
                TextC = TextA * TextB;
                numDisplay = TextA   "×"   TextB   "="   TextC;
            }
            if (count == 3)
            {

                TextC = TextA / TextB;
                numDisplay = TextA   "÷"   TextB   "="   TextC;

            }
            count = 4;

            return numDisplay;
        }
    }
}

---------  ClassNumScreen（奇偶筛选器）  -----------




//---------  ClassNumScreen（奇偶筛选器）  -----------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsDemo01
{
    class ClassNumScreen
    {
        public int star = 3;
        private static int TextA;     //所需筛选的正整数
        private static int TextB = 0;     //所需筛选的规则
        private static string WorkDisplay;//筛选显示

        // <summary>
        /// 筛选_正整数验证
        /// </summary>
        public string Verify(string textA, string textB)
        {
            if (textA == string.Empty)
            {
                star = 2;
                return "请输入一个正整数！";
            }
            if (!(textB == "偶数" || textB == "奇数"))
            {
                star = 2;
                return "请选择一个筛选规则！";
            }
            try
            {
                if (int.Parse(textA) < 0)
                {
                    star = 1;
                    return "请输入一个正整数！";
                }

                TextA = int.Parse(textA);
                if ((textB == "偶数" || textB == "奇数"))
                {
                    if (textB == "偶数")
                        TextB = 1;
                    else if (textB == "奇数")
                        TextB = 2;
                }
            }
            catch (Exception e)
            {
                star = 1;
                //Txt2.Text = "";
                return "所输入非正整数！";
            }

            //验证完成后筛选
            return Working(TextA, TextB);
        }
        public string Working(int a, int b)
        {
            star = 0;
            string temp = "";
            WorkDisplay = "";
            if (b == 1)
            {
                for (int i = 0; i <= a; i  )
                {
                    if (i % 2 == 0)
                    {
                        WorkDisplay  = temp   i.ToString();
                        temp = ",";
                    }
                }
            }
            else if (b == 2)
            {
                for (int i = 0; i <= a; i  )
                {
                    if (i % 2 != 0)
                    {
                        WorkDisplay  = temp   i.ToString();
                        temp = ",";
                    }
                }
            }
            if (WorkDisplay == string.Empty)
                WorkDisplay = "没有结果";
            return WorkDisplay;
        }
    }
}