C# 程序计算不正确

我有两个计算是正确的，零件和税，但服务和劳动力以及总数是错误的。如果您能了解我所忽略的内容，我们将不胜感激

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication10
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }



     //method for calculating oil and lube charges
        private int OilLubeCharges()
        {
            int total = 0;

            //if oil is checked, add 28 to total
            if (chkOilChange.Checked)
            {
                total += 26;
            }

             //if lube is checked, add 18 to total
            if (chkLube.Checked)
            {
                total += 18;
                return total;
            }
           //If nothing is checked return 0
            else
            {
                return total;
            }
         }

     //method for calculating Flushes
     private int FlushCharges()
     {
         //define local variable
         int total = 0;

         //if radiator is checked, add 30 to total
         if (chkRadiator.Checked)
         {
             total += 30;

             //if transmission is checked, add 80 to total
             if (chkTransmission.Checked)
             {
                 total += 80;
                 return total;
             }
                 //if nothing is checked return 0
             else
             {
                 return total;
             }
         }
         //if nothing is checked return 0
         else
         {
             return total;
         }
      }

     private int MiscCharges()
     {
         //define local variable
         int total = 0;
         //if inspection is checked, add to total
         if (chkInspection.Checked)
         {
             total += 15;
         }

         //if replace muffler is checked, add 100 to total
         if (chkMuffler.Checked)
         {
             total += 100;
         }

         //if tire rotation is checked, add 20 to total
         if (chkTire.Checked)
         {
             total += 20;
             return total;
         }
         //if nothing is checked return 0
         else
         {
             return total;
         }
     }
     //calculate the total for the other charges
     private int OtherCharges()
     {
         int total = 0;
         int labor;
         decimal parts;

        if (int.TryParse(txtLabor.Text, out labor))
         {
             total = labor;
         }

         if (decimal.TryParse(txtParts.Text, out parts))
         {
             txtPartsTotal.Text = parts.ToString("c"); 
             return total;
         }

         else
         {
             return total;
         }

     }

     private decimal TaxCharges()
     {
         decimal addTax;
         string parts = txtParts.Text;
          addTax = Convert.ToDecimal(parts) * 0.06m;
          txtTax.Text = addTax.ToString("c");
          return addTax;
    }

     private decimal TotalCharges()
     {
         decimal total;
         decimal serviceAndLabor;
         total = OtherCharges() + MiscCharges() + OilLubeCharges() + FlushCharges() + TaxCharges();
         txtTotal.Text = total.ToString("c");


         serviceAndLabor = MiscCharges() + OilLubeCharges() + FlushCharges() + OtherCharges();
         txtServiceAndLabor.Text = serviceAndLabor.ToString("c");

         return total;


     }


    private void btnCalculate_Click(object sender, EventArgs e)
    {
        OilLubeCharges();
        FlushCharges();
        MiscCharges();
        OtherCharges();
        TaxCharges();
        TotalCharges();
    }

    private void exitButton_Click(object sender, EventArgs e)
    {
        this.Close();
    }


    }
    }

---

在所有这些“神奇数字”的中间，我会注意到这个代码片段

//if oil is checked, add 28 to total
if (chkOilChange.Checked)
{
    total += 26;
}

---

你想在总数中加28，但只加了26。我发现了问题。在我的旧代码中，当if语句不应该嵌套在另一条语句中时，它嵌套在另一条语句中。最重要的是，我在我的方法中返回了一些东西，所以它从来没有达到一个声明。

 //if radiator is checked, add 30 to total
     if (chkRadiator.Checked)
     {
         total += 30;

         //if transmission is checked, add 80 to total
         if (chkTransmission.Checked)
         {
             total += 80;
             return total;
         }
             //if nothing is checked return 0
         else
         {
             return total;
         }
     }
     //if nothing is checked return 0
     else
     {
         return total;
     }

---

你的问题很不清楚。出问题的实际计算是什么？什么是输入值，什么是预期输出，什么是实际输出。你应该让人们尽可能容易地发现问题，而不必翻阅3页的源代码。你试过了吗？您的预期输出是什么，而实际输出是什么？抱歉，total calculations方法中的具体计算混乱了。由于某种原因被选中的复选框加起来不正确。此外，预期输出取决于用户选择的内容。我尝试过调试，但没有真正起到帮助。然后发布一个用户输入的具体示例，预期的输出是什么，正在输出什么。下面是程序运行的图片。所选项目的预期总产出应该是$286.60，但正如您所看到的，只有$146.60。服务费和人工费应该是276美元，但只有146美元。实际上应该是26美元，我的评论错了。