このコードをループして合計費用の値に加算する方法

Question

このコードをループして合計費用の値を加算する方法を教えてください。あなたは、単にユーザーフォームが上に行くにしたくない場合は

private void totalCostTextBox_TextChanged(object sender, EventArgs e) 
    { 
     if (totalCostTextBox.Text == "€ 0,00") 
      MessageBox.Show("hey!"); 
    } 

が、その後、calculateBtn_Click()の一番下に追加します：

 //end of if statements and variables 

     // Illustrate results 
     costLabel.Text = "Registration: " + registrationFee.ToString("c") + 
      " \nLodging Fee: " + lodgingFee.ToString("c") + " x " + 
      days.ToString() + " days = " + (lodgingFee * days).ToString("c"); 

     decimal totalCost = registrationFee + (lodgingFee * days); 
     if (totalCost == 0) 
     { 
      MessageBox.Show("total cost was zero! Re-Enter data"); 
     } 
     else 
     { 
      totalCostTextBox.Text = totalCost.ToString("c"); 
     } 

ので、ユーザー

using System.Threading.Tasks; 
using System.Windows.Forms; 

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

     private void calculateBtn_Click(object sender, EventArgs e) 
     { 


      // Declaring variables to zero so they can found in a list 
      decimal registrationFee = 0; 
      decimal days = 0; 
      decimal lodgingFee = 0; 



      if (workshopListBox.SelectedIndex != -1 && locationListBox.SelectedIndex != -1) //when list items selected are not below zero 
      { 


       //From workshop list data inputs calculate the variables 
       switch (workshopListBox.SelectedIndex) 
       { 


        case 0:    // in the first case of "Handling Stress" the workshop lasts for 3 days and costs 1000 euro 
         days = 3; 
         registrationFee = 1000; 
         break; //Case finisher 

        case 1:     // in the second case of "Time Mgnt" the workshop lasts for 3 days and costs 800 euro 
         days = 3; 
         registrationFee = 800; 
         break; 

        case 2:     // in the third case of "Supervision skills" the workshop lasts for 3 days and costs 1500 euro 
         days = 3; 
         registrationFee = 1500; 
         break; 

        case 3:     // in the fourth case of "Negotiation" the workshop lasts for 5 days and costs 1300 euro 
         days = 5; 
         registrationFee = 1300; 
         break; 

        case 4:     // in the fifth case of "How to Interview" the workshop lasts for 3 days and costs 500 euro 
         days = 1; 
         registrationFee = 500; 
         break; 

       } 
       //From location list data inputs calculate the variables 


       switch (locationListBox.SelectedIndex) 
       { 


        case 0:    //In the first case in the location list lodging fee per day in Galway is 150 euro 
         lodgingFee = 150; 
         break; 

        case 1:    //In the second case in the location list lodging fee per day in Dublin is 225 euro 
         lodgingFee = 225; 
         break; 

        case 2:    //In the third case in the location list lodging fee per day in Limerick is 175 euro 
         lodgingFee = 175; 
         break; 

        case 3:    //In the fourth case in the location list lodging fee per day in Cork is 300 euro 
         lodgingFee = 300; 
         break; 

        case 4:    //In the fifth case in the location list lodging fee per day in Athlone is 175 euro 
         lodgingFee = 175; 
         break; 

        case 5:    //In the sixth case in the location list lodging fee per day in Ennis is 150 euro 
         lodgingFee = 150; 
         break; 
       } 

      } 


      //end of if statements and variables 

      // Illustrate results 
      costLabel.Text = "Registration: " + registrationFee.ToString("c") + 
       " \nLodging Fee: " + lodgingFee.ToString("c") + " x " + 
       days.ToString() + " days = " + (lodgingFee * days).ToString("c"); 

      totalCostTextBox.Text = (registrationFee + (lodgingFee * days)).ToString("c"); 


     } 
    } 

} 

Answer 1

このコードを追加します。有効なデータを再入力し、テキストボックスにデータを入力する必要があります