C#如何制作一個簡單的電腦小程式

作為一個程式員，如何從淺入深的訓練自己的技術，可以通過一些小程式來訓練

下面簡單介紹一下如何制作一個簡單的電腦小程式

如下為制作之後的小程式截圖

代碼段 其中計算用了dataTable的一個函數

dt.Compute(CurStr, string.Empty)

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 Calculate
{
    public partial class CalculateFrom : Form
    {
        public CalculateFrom()
        {
            InitializeComponent();
        }
        private string FhStr = string.Empty;
        private string CurStr = string.Empty;//計算字元串
        //等于的 等于按鈕處理
        private void Click_DENG_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            if (string.IsNullOrEmpty(CurStr))
            {
                return;
            }
            List<string> KeyList = new List<string> { "+", "-", "*", "/" };
            if (KeyList.Contains(CurStr.Substring(CurStr.Length - 1)))//判斷最後一位為四則運算符，則去掉
            {
                CurStr = CurStr.Substring(CurStr.Length - 1);
            }
            if (string.IsNullOrEmpty(CurStr))//若此時為空則指派計算結果零值
            {
                this.Text_JM.Text = "0";
                return;
            }
            else
            {
                CurStr = Convert.ToString(dt.Compute(CurStr, string.Empty));//若滿足條件 則計算 使用 DataTable的計算形式
                this.Text_JM.Text = CurStr;//計算結果指派給Text
            }
        }
        //數值加入 // 裡面包含資料隻計算
        private void ValueClick(string ClickV)
        {
            //進行判斷，判斷點選的是否是非空數值或者小數位數
            if (!string.IsNullOrEmpty(ClickV))
            {
                if (ClickV == "." && string.IsNullOrEmpty(CurStr))//第一位為小數位數
                {
                    CurStr = "0.";//如果首先點選了小數位數 自動在前面增加零值
                }
                else if (ClickV == ".")//如果已經存在小數位數，不可以再輸入
                {
                    if (!CurStr.Contains("."))
                    {
                        CurStr = CurStr + ".";
                    }
                }
                else CurStr = CurStr + ClickV;
                this.Text_JM.Text = CurStr;//把字元串複制給前台顯示的text中
            }
        }
        //四則運算符号處理
        private void ValueCalculate(string Key)
        {
            if (string.IsNullOrEmpty(CurStr))
            {
                return;
            }
            if (CurStr.Substring(CurStr.Length - 1, 1) == ".")
            {
                CurStr = CurStr + "0";//若是最後一位為小數 自動後面補齊一個零值
            }
            List<string> KeyList=new List<string>{"+","-","*","/"};
            if (KeyList.Contains(CurStr.Substring(CurStr.Length - 1, 1)))//若最後一位已經是四則運算符号，則不再操作
            {
                return;//最後一位目前已經是符号
            }
            CurStr = CurStr + Key;
            this.Text_JM.Text = CurStr;
        }
        #region 數值
        private void Click_1_Click(object sender, EventArgs e)
        {
            ValueClick("1");
        }

        private void Click_2_Click(object sender, EventArgs e)
        {
            ValueClick("2");

        }

        private void Click_3_Click(object sender, EventArgs e)
        {
            ValueClick("3");
        }

        private void Click_4_Click(object sender, EventArgs e)
        {
            ValueClick("4");
        }

        private void Click_5_Click(object sender, EventArgs e)
        {
            ValueClick("5");
        }

        private void Click_6_Click(object sender, EventArgs e)
        {
            ValueClick("6");
        }

        private void Click_7_Click(object sender, EventArgs e)
        {
            ValueClick("7");
        }

        private void Click_8_Click(object sender, EventArgs e)
        {
            ValueClick("8");
        }

        private void Click_9_Click(object sender, EventArgs e)
        {
            ValueClick("9");
        }

        private void Click_0_Click(object sender, EventArgs e)
        {
            ValueClick("0");
        }
        //小數點
        private void Click_C_Click(object sender, EventArgs e)
        {
            ValueClick(".");
        }
        #endregion

        #region 加減乘除
        private void Click_A_Click(object sender, EventArgs e)
        {
            ValueCalculate("+");
        }

        private void Click_R_Click(object sender, EventArgs e)
        {
            ValueCalculate("-");

        }

        private void Click_X_Click(object sender, EventArgs e)
        {
            ValueCalculate("*");

        }

        private void Click_L_Click(object sender, EventArgs e)
        {
            ValueCalculate("/");

        }
        #endregion
    }
}