c# - 如何在 C# 上为 GUI 计算器做简单的算法？

Question

例如我为 WP7 做计算器。

这是我的简单逻辑类：

public class CalcLogic
    {
        public static double Calculate(double a, double b, string operation)
        {
            double res = 0;
            switch (operation)
            {
                case ("+"):
                    res = a + b;
                    break;
                case ("-"):
                    res = a - b;
                    break;
                case ("*"):
                    res = a * b;
                    break;
                case ("/"):
                    res = a / b;
                    break;
                default: break;
            }
            return res;
        }
    }

这是在我的 MainPage.xaml.cs 中：

private const int Rows = 4, Cols = 4;
        private string[,] buttonTags = { { "7", "8", "9", "/" }, 
                                         { "4", "5", "6", "*" },
                                         { "1", "2", "3", "-" },
                                         { "0", "C", "=", "+" }
                                       };

        private Button[,] buttons;

        // Constructor
        public MainPage()
        {
            InitializeComponent();
            CreateButtons();
        }

        public void CreateButtons()
        {
            buttons = new Button[Rows, Cols];
            for (int i = 0; i < Rows; i++)
            {
                for (int j = 0; j < Cols; j++)
                {
                    buttons[i, j] = new Button();
                    buttons[i, j].Content = buttonTags[j, i];
                    buttons[i, j].Width = 120;
                    buttons[i, j].Height = 110;
                    buttons[i, j].Margin = new Thickness(i * 110 + 5, j * 110 + 100, 0, 0);
                    buttons[i, j].VerticalAlignment = System.Windows.VerticalAlignment.Top;
                    buttons[i, j].HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
                    buttons[i, j].Name = "button" + buttonTags[j, i];
                    buttons[i, j].Click += new System.Windows.RoutedEventHandler(Button_Click);
                    ContentPanel.Children.Add(buttons[i, j]);
                    ContentPanel.UpdateLayout();
                }
            }
        }

问题是 - Button_Click 方法的正确性如何？

private void Button_Click(object sender, EventArgs e)
        {
            Button button = sender as Button;
            tbResult.Text += button.Content.ToString();

            string operation = "";
            double a = 0;
            double b = 0;

            if (button.Content.ToString() == "=")
            {
                tbResult.Text = CalcLogic.Calculate(a, b, operation).ToString();
            }
            if (button.Content.ToString() == "C")
            {
                tbResult.Text = "";
            }

            ...

        }

也许我应该只写我的 TextBox 数字并签名，然后解析？但我认为这不是正确的算法。

升级版：

我就是这样做的，效果很好。但我不确定正确的实现：

private void Button_Click(object sender, EventArgs e)
        {
            try
            {
                Button button = sender as Button;
                double res;
                if (Double.TryParse(button.Content.ToString(), out res))
                {
                    DigitClick(button.Content.ToString());
                }
                else
                {
                    OperatorClick(button.Content.ToString());
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                ClearAll();
            }
        }


        private void ClearAll()
        {
            first = second = result = 0;
            operStr = "";
            newNum = true;
            tbResult.Text = "";
        }

        private void DigitClick(string dig)
        {
            if (newNum)
            {
                tbResult.Text = "";
            }
            tbResult.Text += dig;
            newNum = false;
        }

        private void OperatorClick(string oper)
        {
            if (oper == "=")
            {
                if (operStr == "=" || operStr == "")
                {
                    return;
                }
                second = Convert.ToInt32(tbResult.Text);
                result = CalcLogic.Calculate(first, second, operStr);
                tbResult.Text = result.ToString();
                operStr = oper;
            }
            else if (oper == "C")
            {
                ClearAll();
            }
            else
            {
                operStr = oper;
                first = Convert.ToInt32(tbResult.Text);
            }

            newNum = true;
        }

我只是想知道 GUI 计算器的最佳实现，谢谢。

Answer 1

不太确定你在问什么，但你从来没有为你的操作变量分配任何东西。它始终是一个空字符串。