用C# WinForm写的一个简单的计算器程序(可以输入复杂的表达式)，欢迎大家指出Bug

本人是初学者，刚看到WinForm编程这一章，便自己动手写了一个计算器的程序当做练习。网上查过的大多数资料都说到了用逆波兰式计算，但是我试了下不太会，就用了自己的方法写了下试试，发现居然能用。

下面是界面截图：

（Expression:可以鼠标点击输入计算式，也可以直接粘贴进去）

(clear可以清除表达式，Backspace能删除表达式的最后一位)

以下是计算部分源码，代码比较冗余，没来得及修改

// -----------------------------------------------------------------------// <copyright file="Calculate.cs" company="">// TODO: Update copyright text.// </copyright>// -----------------------------------------------------------------------using System.Collections;namespace WinFormSamples{    using System;    using System.Collections.Generic;    using System.Linq;    using System.Text;    using System.Windows.Forms;    /// <summary>    /// TODO: Update summary.    /// </summary>    public class Calculate    {        public string GetResult(string str)        {            str = str + "+";            char[] expArry =  str.ToCharArray();            string operations="()+-*/";            Hashtable signs =new Hashtable();            string[] numArry = str.Split('(',')','+','-','*','/'); //分割字符串，提取表达式中的数字            //定义操作符的优先级并存入哈希表            signs.Add("(",0);            signs.Add(")",0);            signs.Add("+",1);            signs.Add("-",1);            signs.Add("*",2);            signs.Add("/",2);                            string[] resultArry = new string[99];                int resultIndex = 0;                int numIndex = 0;                for (int i = 0; i < str.Length - 1; i++)                {                    if (operations.Contains(expArry[i]))                    {                        //遇到符号直接存入resultArry                        resultArry[resultIndex] = expArry[i].ToString();                        resultIndex++;                    }                    else if (operations.Contains(expArry[i + 1]))                    {                        //连续非符号字符，从numArry取出一个元素放入resultArry                        while (numArry[numIndex] == "")                        //去除numArry中的空元素                        {                            numIndex++;                        }                        resultArry[resultIndex] = numArry[numIndex];                        numIndex++;                        resultIndex++;                    }                }                Stack<char> sign_stack = new Stack<char>();//定义符号栈                Stack<string> num_stack = new Stack<string>();//定义操作数栈                char calc_sign;                try                {                for (int i = 0; i < resultIndex + 1; i++)                {                    if (i == resultIndex)                    {                        if (sign_stack.Count != 0)                        {                            calc_sign = sign_stack.Pop();                            Calc(ref sign_stack, ref num_stack,ref resultArry[i],ref calc_sign);                            while (num_stack.Count() > 1)                            //计算到栈中只剩一个操作数为止                            {                                calc_sign = sign_stack.Pop();                                Calc(ref sign_stack, ref num_stack, ref resultArry[i], ref calc_sign);                            }                        }                    }                    else if (operations.Contains(resultArry[i]))                    {                        if (resultArry[i] != "(")                        {                            if (sign_stack.Count() == 0 || Convert.ToInt32(signs[resultArry[i]]) > Convert.ToInt32(signs[sign_stack.Peek().ToString()]))                            //第一个操作符或者当前操作符优先级大于符号栈栈顶元素时，当前操作符入栈                            {                                sign_stack.Push(resultArry[i].ToCharArray()[0]);                            }                            else                            {                                //否则，符号栈出栈操作符，数字栈出栈两个操作数进行运算                                calc_sign = sign_stack.Pop();                                Calc(ref sign_stack, ref num_stack,ref resultArry[i],ref calc_sign);                            }                        }                        else                        {                            sign_stack.Push(resultArry[i].ToCharArray()[0]);                        }                    }                    else                    {                        num_stack.Push(resultArry[i]);                    }                }                                //结果出栈                return num_stack.Pop();            }            catch (Exception e)            {                MessageBox.Show("表达式格式不正确，请检查！ "+e.Message);                return null;            }        }        public  string CalculateResult(string num1, string num2, char sign)        {            double result = 0;            double oper_num1=Convert.ToDouble(num1);            double oper_num2=Convert.ToDouble(num2);            if (sign.ToString()=="+")            {                result = oper_num1 + oper_num2;            }            if (sign.ToString() == "-")            {                result = oper_num1 - oper_num2;            }            if (sign.ToString() == "*")            {                result = oper_num1 * oper_num2;            }            if (sign.ToString() == "/")            {                if(oper_num2!=0)                result = oper_num1 / oper_num2;                else                    MessageBox.Show("表达式中有除0操作，请检查！");            }            return result.ToString();        }        public void Calc(ref Stack<char> sign, ref Stack<string> num, ref string str, ref char calc_sign)        {            string num1 = "";            string num2 = "";            if (str == ")")            {                while (calc_sign != '(')                {                    num2 = num.Pop();                    num1 = num.Pop();                    num.Push(CalculateResult(num1, num2, calc_sign));                    calc_sign = sign.Pop();                }            }            else            {                num2 = num.Pop();                num1 = num.Pop();                num.Push(CalculateResult(num1, num2, calc_sign));                if (str!=null&&"()+-*/".Contains(str))                {                    sign.Push(str.ToCharArray()[0]);                }            }        }    }}

下面是窗体程序：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace WinFormSamples{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }                private void button1_Click(object sender, EventArgs e)        {            textBox1.Text += "1";        }        private void button2_Click(object sender, EventArgs e)        {            textBox1.Text += "2";        }        private void button3_Click(object sender, EventArgs e)        {            textBox1.Text += "3";        }        private void button4_Click(object sender, EventArgs e)        {            textBox1.Text += "4";        }        private void button5_Click(object sender, EventArgs e)        {            textBox1.Text += "5";        }        private void button6_Click(object sender, EventArgs e)        {            textBox1.Text += "6";        }        private void button7_Click(object sender, EventArgs e)        {            textBox1.Text += "7";        }        private void button8_Click(object sender, EventArgs e)        {            textBox1.Text += "8";        }        private void button9_Click(object sender, EventArgs e)        {            textBox1.Text += "9";        }        private void button10_Click(object sender, EventArgs e)        {            textBox1.Text += "0";        }        private void button11_Click(object sender, EventArgs e)        {            textBox1.Text += "*";        }        private void button12_Click(object sender, EventArgs e)        {            textBox1.Text += ".";        }        private void button13_Click(object sender, EventArgs e)        {            textBox1.Text += "+";        }        private void button14_Click(object sender, EventArgs e)        {            textBox1.Text += "-";        }        private void button15_Click(object sender, EventArgs e)        {            textBox1.Text += "/";        }        private void button16_Click(object sender, EventArgs e)        {            Calculate calculate = new Calculate();            textBox2.Text = calculate.GetResult(textBox1.Text);        }        private void button17_Click(object sender, EventArgs e)        {            textBox1.Text = "";            textBox2.Text = "";        }        private void button18_Click(object sender, EventArgs e)        {            textBox1.Text += "(";        }        private void button19_Click(object sender, EventArgs e)        {            textBox1.Text += ")";        }        private void button20_Click(object sender, EventArgs e)        {            textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length-1,1);        }        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)        {            System.Diagnostics.Process.Start("chrome.exe", "http://msdn.microsoft.com/zh-cn/default.aspx");        }    }}