Question

我尝试过关于这个主题的类似问题和答案，但我似乎无法找到（或理解）一个解决方案。

在表单1上，我有三个文本框，可以接收用户输入。在一个单独的类中，我有一个方法需要从这些文本框访问输入。

Form1.cs只包含文本框和一些按钮。另一个类中的方法是

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RealEstateApp
{
    public class RealEstateApp : Form1
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        public static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());

            const double RENTAL_AMOUNT = 1000.00;

            RealEstateInvestment invest1 = new
                RealEstateInvestment(2004, 150000, "65th Street");
            invest1.MonthlyExpense = GetExpenses();
            invest1.IncomeFromRent = RENTAL_AMOUNT;
            invest1.DetermineMonthlyEarnings());
            RealEstateInvestment invest2 = new
                RealEstateInvestment("72 Westchester Dr.", 229000);

            invest2.MonthlyExpense = 900;
            invest2.IncomeFromRent = 1500.00;
        }

        public double GetExpenses()
        {
            double insurance;
            double taxes;
            double utilities;
            string inValue;

            inValue = txtBoxInsurance.Text; //Console.ReadLine(); (get user input from textbox)
            insurance = double.Parse(inValue);
            inValue = txtBoxTax.Text; //Console.ReadLine(); (get user input from textbox)
            taxes = double.Parse(inValue);
            inValue = txtBoxUtilities.Text; //Console.ReadLine(); (get user input from textbox)
            utilities = double.Parse(inValue);
            return (insurance / 12 + taxes / 12 + utilities);
        }

    }
}

由于我确信您已经注意到有c＃人员，我遇到了错误＆＃39;非静态字段，方法或属性需要对象引用。＆＃39;

my static void Main（）在第二个类中，如果它改变了什么。

修改的

我现在已经把整个班级代码放在上面，以便更好地了解正在发生的事情。

干杯，

马特

Answer 1

将文本框的值传递给函数而不是文本框它会将您的类与表单类分离，您可以通过传递来自任何其他类的值来使用它。

定义

public static double GetExpenses(int pinsurance, int ptaxes, int putilities)
{
         return (insurance / 12 + taxes / 12 + utilities);
}

呼叫

使用Int32.TryParse处理文本框中非int值的异常。

int insurance;
bool result = Int32.TryParse(txtBoxInsurance.Text, out insurance);
//Similarly you have to parse taxes and  utilities
GetExpenses(insurance, taxes, utilities);

Answer 2

我猜你得错了 inValue = txtBoxInsurance.Text;

这是因为您的GetExpenses()方法属于静态类。其中txtboxInsurance是类Form1的私有和非静态属性。您无法从静态方法访问非静态方法属性。

相反，你可以做的是

public static  class YourStaticClass

static string _insurance;
static string _tax;
static string _utilities;

       public static double GetExpenses()

    {
        double insurance;
        double taxes;
        double utilities;
        string inValue;

        //Console.Write("Yearly Insurance: ");
        inValue = _insurance; //Console.ReadLine(); (get user input from textbox)
        insurance = double.Parse(inValue);
        //Console.Write("Yearly Tax: ");
        inValue = _tax; //Console.ReadLine(); (get user input from textbox)
        taxes = double.Parse(inValue);
        //Console.Write("Monthly Utilities: ");
        inValue = _utilities; //Console.ReadLine(); (get user input from textbox)
        utilities = double.Parse(inValue);
        return (insurance / 12 + taxes / 12 + utilities);
    }

并且

public  partial class Form1 : Form 

 YourStaticClass._insurance=txtBoxInsurance.Text;
 YourStaticClass._tax=txtBoxTax.Text;
 YourStaticClass._utilities=txtBoxUtilities.Text;

我认为这应该有用

读取文本框并将输入分配给另一个类中的变量

2 个答案: