C# WinAppCalculator to WebAppCalculator in Azure

嗨，我对编码很陌生，尤其是在c#中，我的项目有问题。我希望使用c#在线制作一个计算器，并将其上传到azure中的数据库和主机。这是我的问题：

我在Visual Studio中的c#代码使用web表单时遇到问题。它根本不起作用，它可以输入数字和运算，但没有得到正确的结果，例如3+3=33。这是来自WinApp的转换，所以它可能是从那里来的？但我重新创建了UI，并重新调整了代码的用途，以适应在线应用程序。等我把它用起来后，我计划把它上传到azure上。这不起作用有什么原因吗？我在.NET中的WinApp有一个非常相似的代码，并且可以工作，所以这是.NET/ASP.NET的问题吗？感谢您的帮助！

这是.aspx.cs文件：

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication2
{
public partial class WebForm1 : Page
{
bool operationPerf = false;
string operation = "";
double answer = 0;
protected void NumbEvent(object sender, EventArgs e)
{
if (textbox.Text == "0" || operationPerf)
textbox.Text = string.Empty;
Button butt = (Button)sender;
textbox.Text += butt.Text;
operationPerf = false;
label.Text = label.Text + " " + textbox.Text;
}
protected void OperandEvent(object sender, EventArgs e)
{
operationPerf = true;
Button butt = (Button)sender;
string newOperand = butt.Text;
label.Text = label.Text + " " + newOperand;
switch (operation)
{
case "+":
textbox.Text = (answer + Double.Parse(textbox.Text)).ToString();
break;
case "-":
textbox.Text = (answer - Double.Parse(textbox.Text)).ToString();
break;
case "*":
textbox.Text = (answer * Double.Parse(textbox.Text)).ToString();
break;
case "/":
textbox.Text = (answer / Double.Parse(textbox.Text)).ToString();
break;
case "^":
textbox.Text = (Math.Pow(answer, Double.Parse(textbox.Text))).ToString();
break;
case "√":
textbox.Text = (Math.Sqrt(Double.Parse(textbox.Text))).ToString();
break;
default:
break;
}
answer = Double.Parse(textbox.Text);
operation = newOperand;
}
protected void Bequal_Click(object sender, EventArgs e)
{
operationPerf = true;
switch (operation)
{
case "+":
textbox.Text = (answer + Double.Parse(textbox.Text)).ToString();
break;
case "-":
textbox.Text = (answer - Double.Parse(textbox.Text)).ToString();
break;
case "*":
textbox.Text = (answer * Double.Parse(textbox.Text)).ToString();
break;
case "/":
textbox.Text = (answer / Double.Parse(textbox.Text)).ToString();
break;
case "^":
textbox.Text = (Math.Pow(answer, Double.Parse(textbox.Text))).ToString();
break;
case "√":
textbox.Text = (Math.Sqrt(Double.Parse(textbox.Text))).ToString();
break;
default:
break;
}
label.Text = label.Text + " = " + textbox.Text;
label.Text = "";
answer = Double.Parse(textbox.Text);
textbox.Text = answer.ToString();
answer = 0;
operation = "";
}
protected void BC_Click(object sender, EventArgs e)
{
textbox.Text = "0";
label.Text = "";
answer = 0;
operation = "";
}
}
}

这是.aspx文件：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication2.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Calculator 9001</title>
</head>
<body>
<form id="form1" runat="server">
<p>
<asp:Label ID="label" runat="server"></asp:Label>
</p>
<p>
<asp:TextBox ID="textbox" runat="server" Height="35px" ReadOnly="True" Width="300px"></asp:TextBox>
</p>
<p>
&nbsp;</p>
<p>
<asp:Button ID="Bdiv" runat="server" Height="75px" OnClick="OperandEvent" Text="/" Width="100px" />
<asp:Button ID="Bmul" runat="server" Height="75px" OnClick="OperandEvent" Text="*" Width="100px" />
<asp:Button ID="Bmin" runat="server" Height="75px" OnClick="OperandEvent" Text="-" Width="100px" />
<asp:Button ID="Bplus" runat="server" Height="75px" OnClick="OperandEvent" Text="+" Width="101px" />
</p>
<p>
<asp:Button ID="B7" runat="server" Height="75px" OnClick="NumbEvent" Text="7" Width="100px" />
<asp:Button ID="B8" runat="server" Height="75px" OnClick="NumbEvent" Text="8" Width="100px" />
<asp:Button ID="B9" runat="server" Height="75px" OnClick="NumbEvent" Text="9" Width="100px" />
<asp:Button ID="Bpow" runat="server" Height="75px" OnClick="OperandEvent" Text="^" Width="100px" />
</p>
<p>
<asp:Button ID="B4" runat="server" Height="75px" OnClick="NumbEvent" Text="4" Width="100px" />
<asp:Button ID="B5" runat="server" Height="75px" OnClick="NumbEvent" Text="5" Width="100px" />
<asp:Button ID="B6" runat="server" Height="75px" OnClick="NumbEvent" Text="6" Width="100px" />
<asp:Button ID="Broot" runat="server" Height="75px" OnClick="OperandEvent" Text="√" Width="100px" />
</p>
<p>
<asp:Button ID="B1" runat="server" Height="75px" OnClick="NumbEvent" Text="1" Width="100px" />
<asp:Button ID="B2" runat="server" Height="75px" OnClick="NumbEvent" Text="2" Width="100px" />
<asp:Button ID="B3" runat="server" Height="75px" OnClick="NumbEvent" Text="3" Width="100px" />
</p>
<p>
<asp:Button ID="B0" runat="server" Height="75px" OnClick="NumbEvent" Text="0" Width="100px" />
<asp:Button ID="Bdot" runat="server" Height="75px" OnClick="NumbEvent" Text="." Width="100px" />
<asp:Button ID="BC" runat="server" Height="75px" OnClick="BC_Click" Text="C" Width="100px" />
<asp:Button ID="Bequal" runat="server" Height="75px" OnClick="Bequal_Click" Text="=" Width="100px" />
</p>
</form>
</body>
</html>

更新：

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication2
{
public partial class WebForm1 : Page
{
protected void Page_Load(object sender, EventArgs e)
{
ViewState["operationPerf"] = "false";
ViewState["operation"] = string.Empty;
ViewState["answer"] = "0";
}
protected void NumbEvent(object sender, EventArgs e)
{
if (textbox.Text == "0" || bool.Parse(ViewState["operationPerf"].ToString()) == true)
textbox.Text = string.Empty;
Button butt = (Button)sender;
textbox.Text += butt.Text;
ViewState["operationPerf"] = false;
label.Text = label.Text + " " + textbox.Text;
}
protected void OperandEvent(object sender, EventArgs e)
{
ViewState["operationPerf"] = true;
Button butt = (Button)sender;
string newOperand = butt.Text;
label.Text = label.Text + " " + newOperand;
switch (ViewState["operation"])
{
case "+":
textbox.Text = (Double.Parse(Convert.ToString(ViewState["answer"])) + Double.Parse(textbox.Text)).ToString();
break;
case "-":
textbox.Text = (Double.Parse(Convert.ToString(ViewState["answer"])) - Double.Parse(textbox.Text)).ToString();
break;
case "*":
textbox.Text = (Double.Parse(Convert.ToString(ViewState["answer"])) * Double.Parse(textbox.Text)).ToString();
break;
case "/":
textbox.Text = (Double.Parse(Convert.ToString(ViewState["answer"])) / Double.Parse(textbox.Text)).ToString();
break;
case "^":
textbox.Text = (Math.Pow(Double.Parse(Convert.ToString(ViewState["answer"])), Double.Parse(textbox.Text))).ToString();
break;
case "√":
textbox.Text = (Math.Sqrt(Double.Parse(textbox.Text))).ToString();
break;
default:
break;
}
ViewState["answer"] = textbox.Text;
ViewState["operation"] = newOperand;
}
protected void Bequal_Click(object sender, EventArgs e)
{
ViewState["operationPerf"] = true;
switch (ViewState["operation"])
{
case "+":
textbox.Text = (Double.Parse(Convert.ToString(ViewState["answer"])) + Double.Parse(textbox.Text)).ToString();
break;
case "-":
textbox.Text = (Double.Parse(Convert.ToString(ViewState["answer"])) - Double.Parse(textbox.Text)).ToString();
break;
case "*":
textbox.Text = (Double.Parse(Convert.ToString(ViewState["answer"])) * Double.Parse(textbox.Text)).ToString();
break;
case "/":
textbox.Text = (Double.Parse(Convert.ToString(ViewState["answer"])) / Double.Parse(textbox.Text)).ToString();
break;
case "^":
textbox.Text = (Math.Pow(Double.Parse(Convert.ToString(ViewState["answer"])), Double.Parse(textbox.Text))).ToString();
break;
case "√":
textbox.Text = (Math.Sqrt(Double.Parse(textbox.Text))).ToString();
break;
default:
break;
}
label.Text = label.Text + " = " + textbox.Text;
label.Text = "";
ViewState["answer"] = textbox.Text;
textbox.Text = ViewState["answer"].ToString();
ViewState["answer"] = 0;
ViewState["operation"] = "";
}
protected void BC_Click(object sender, EventArgs e)
{
textbox.Text = "0";
label.Text = "";
ViewState["answer"] = 0;
ViewState["operation"] = "";
}
}

}

我认为是这些页面级别的变量。

bool operationPerf = false;
string operation = "";
double answer = 0;

就像@erastl说的那样。这些变量将无法保持其值。你需要在页面上隐藏一个字段，或者一个视图状态变量

如果我没有记错的话，ViewState和SessionState变量总是字符串，所以在使用它们时必须强制转换它们编辑：它们是对象。仍需铸造

protected void Page_Load(object sender, EventArgs e)
{
ViewState["operationPerf"] = "false";
ViewState["operation"] = string.Empty;
ViewState["answer"] = "0";
}

后期

if (textbox.Text == "0" || bool.Parse(ViewState["operationPerf"].ToString()) == true)
...

而不是

answer = Double.Parse(textbox.Text);

使用

ViewState["answer"] = textbox.Text;

当您实际使用该值进行计算时，请使用Double.Parse。

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