使用 Asp.net 网络表单创建与 windows 相同的计算器

Question

我被要求制作一个与 Windows 计算器类似的计算器。我想知道问题出在哪里。我可以按 Button1 + Button2，但我不能按按钮“=”。后面的代码我为 "Equal_Click" 创建了一个方法。但它似乎不起作用。是因为String不能和Bool在一起吗？我一直按“=”，它什么也没显示。有人看到问题出在哪里了吗？

**这是我的前台代码**

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body style="height: 369px; width: 363px">
    <form id="form1" runat="server">
        <div>
            <asp:TextBox ID="result" runat="server" Text="0" Height="34px" Width="216px" ReadOnly="true"></asp:TextBox><br />
            <asp:Button ID="Button1" runat="server" Text="1" Height="36px" Width="41px" OnClick="Button_Click" />
            <asp:Button ID="Button2" runat="server" Text="2" Height="36px" Width="41px" OnClick="Button_Click"/>
            <asp:Button ID="Button3" runat="server" Text="3" Height="36px" Width="41px" OnClick="Button_Click"/>  
            <asp:Button ID="Button14" runat="server" Text="+" Height="36px" Width="41px" OnClick="Operator_Click"/>
            <asp:Button ID="Button17" runat="server" Text="CE" Height="36px" Width="41px" OnClick="Button17_Click"/>
            <br />
            <asp:Button ID="Button4" runat="server" Text="4" Height="36px" Width="41px" OnClick="Button_Click"/>
            <asp:Button ID="Button5" runat="server" Text="5" Height="36px" Width="41px" OnClick="Button_Click"/>
            <asp:Button ID="Button6" runat="server" Text="6" Height="36px" Width="41px" OnClick="Button_Click"/>
            <asp:Button ID="Button13" runat="server" Text="-" Height="36px" Width="41px" OnClick="Operator_Click"/>
            <asp:Button ID="Button16" runat="server" Text="C" Height="36px" Width="41px"/>
            <br />
            <asp:Button ID="Button7" runat="server" Text="7" Height="36px" Width="41px" OnClick="Button_Click"/>
            <asp:Button ID="Button8" runat="server" Text="8" Height="36px" Width="41px" OnClick="Button_Click"/>
            <asp:Button ID="Button9" runat="server" Text="9" Height="36px" Width="41px" OnClick="Button_Click"/>
            <asp:Button ID="Button12" runat="server" Text="*" Height="36px" Width="41px" OnClick="Operator_Click"/>
            <br />
            <asp:Button ID="Button10" runat="server" Text="0" Height="36px" Width="86px" OnClick="Button_Click"/>
            <asp:Button ID="Button11" runat="server" Text="." Height="36px" Width="41px" OnClick="Operator_Click"/>
            <asp:Button ID="Button15" runat="server" Text="/" Height="36px" Width="41px" OnClick="Operator_Click"/>
            <asp:Button ID="Equal" runat="server" Text="=" Height="36px" Width="41px" OnClick="Equal_Click"/>
        </div>



    </form>
</body>
</html>

这是我的代码隐藏 是不是逻辑有问题？

public partial class calculator : System.Web.UI.Page
    {
        Double value = 0;
        string operation = "";
        bool operation_press = false;

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Equal_Click(object sender, EventArgs e)
        {
            operation_press = false;
            switch (operation)
            {
                case "+":
                    result.Text = (value + Double.Parse(result.Text)).ToString();
                    break;
                case "-":
                    result.Text = (value + Double.Parse(result.Text)).ToString();
                    break;
                case "*":
                    result.Text = (value + Double.Parse(result.Text)).ToString();
                    break;
                case "/":
                    result.Text = (value + Double.Parse(result.Text)).ToString();
                    break;
                default:
                    break;
            }

        }

        protected void Button_Click(object sender, EventArgs e)
        {

            if ((result.Text == "0") || (operation_press))
                result.Text = string.Empty;

            Button b = (Button)sender;
            result.Text = result.Text + b.Text;
        }

        protected void Button17_Click(object sender, EventArgs e)
        {
            result.Text = "0";
        }

        protected void Operator_Click(object sender, EventArgs e)
        {
            Button b = (Button)sender;
            result.Text = result.Text + b.Text;
            //value = Convert.ToDouble(Double.Parse(result.Text);
            operation = b.Text;
            operation_press = true;
        }

    }

Answer 1

您似乎正在尝试将 TextBox 的整个值转换为整数。这行不通，因为 TextBox 还包含 + 或 * 等。此外，在计算总数时 operation 的值将始终为空，因为您没有将其保存在 Operator_Click.

中的状态

protected void Equal_Click(object sender, EventArgs e)
{
    //get the values for calculation
    int[] results = Regex.Split(result.Text, @"-|\+|\*|\/").Select(x => Convert.ToInt32(x)).ToArray();

    //get the operation
    string operation = Regex.Split(result.Text, @"[0-9]+")[1];

    //do the calculation
    switch (operation)
    {
        case "+":
            result.Text = (results[0] + results[1]).ToString();
            break;
        case "-":
            result.Text = (results[0] - results[1]).ToString();
            break;
        case "*":
            result.Text = (results[0] * results[1]).ToString();
            break;
        case "/":
            result.Text = (results[0] / results[1]).ToString();
            break;
        default:
            break;
    }
}

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