C# 更新列表中项目的文本框控件计数<&燃气轮机；当它'；s使用自定义事件C清除#

我有一个主窗体，它包含两个只读文本框和两个按钮，可以打开用户想要显示的PizzaCreatorForms的任意多个实例，其他按钮显示PizzaOrdersListViewForm的一个实例。这两个只读文本框跟踪显示了多少PizzaCreatorForm实例（这部分有效），另一个跟踪创建了多少项（这部分也有效）

我应该补充一点，PizzaCreatorForm创建的每个对象都会添加到列表中，以及listView.Items控件中的PizzaOrdersListViews中。主窗体和PizzaOrderListViewForm中还有一个清除按钮，用于清除列表

我的代码可以工作，但我遇到了两个问题

每当在列表中添加新对象时，当我希望它从1开始时，它从0开始

每当我使用PizzaOrderListViewForm中的clear按钮清除列表时，listview控件项都会被清除，但文本框显示相同的数字

这是我尝试用于#2的自定义事件：

MainForm

    public partial class Form1 : Form
    { 
       public static List<Pizza> pizzaList = new List<Pizza>();
       public List<Pizza> PizzaList
       {
           get { return pizzaList; }
           set { pizzaList = value; }
       }

       //Where PizzaOrdersListViewForm is instantiated
       private void displayOrdersToolStripMenuItem_Click(object sender, EventArgs e)
       {
           PizzaOrdersListViewForm orderListV = new PizzaOrdersListViewForm();


       }
       //Where PizzaCreatorForm is instantiated
       private void newPizzaOrder_Click(object sender, EventArgs e)
       {
           PizzaCreatorForm pizzaForms = new PizzaCreatorForm(this);
           pizzaForms.PizzaInList += PizzaInListHandler;
           pizzasCreatedCounterTextBox.TextChanged += PizzaInListHandler;
       }

       public void PizzaInListHandler(object sender, EventArgs e)
       {
           pizzasCreatedCounterTextBox.Text = pizzaList.Count.ToString();        
       }
       public void ClearMainListChangeHandler(object sender, EventArgs e)
       {  
           pizzaList.Clear();
       }
    }

    public partial class PizzaCreatorForm : Form
    {
       public EventHandler PizzaInList;

       public Pizza Order
       {
           //Code that assigns Pizza class member variables to control values
       }

       Form1 MainForm = null;

       public PizzaCreatorForm(Form1 mForm)
       {
            InitializeComponent();
            MainForm = mForm
       }

       private void orderNewPizaaToolStripButton_Click(object sender, EventArgs e)
       {
            if(PizzaInList != null)
            {
                PizzaInList(this, new EventArgs());
            }

            MainForm.PizzaList.Add(Order);

            Order = new Pizza();
       }
    }

    public partial class PizzaOrdersListViewForm : Form
    {
       public EventHandler ClearMainList;

       Form1 mainForm = null;

       public PizzaOrdersListViewForm(Form1 TheMain)
       {
          InitializeComponent();
          mainForm = TheMain;
       }

       private void clearToolStripButton_Click(object sender, EventArgs e)
       {
          if(ClearMainList != null)
          {
              ClearMainList(this, new EventArgs());
          }
          ClearMainList += mainForm.ClearMainListChangeHandler;
          pizzaListView.Items.Clear();

       }

    }

PizzaOrdersListViewForm

    public partial class Form1 : Form
    { 
       public static List<Pizza> pizzaList = new List<Pizza>();
       public List<Pizza> PizzaList
       {
           get { return pizzaList; }
           set { pizzaList = value; }
       }

       //Where PizzaOrdersListViewForm is instantiated
       private void displayOrdersToolStripMenuItem_Click(object sender, EventArgs e)
       {
           PizzaOrdersListViewForm orderListV = new PizzaOrdersListViewForm();


       }
       //Where PizzaCreatorForm is instantiated
       private void newPizzaOrder_Click(object sender, EventArgs e)
       {
           PizzaCreatorForm pizzaForms = new PizzaCreatorForm(this);
           pizzaForms.PizzaInList += PizzaInListHandler;
           pizzasCreatedCounterTextBox.TextChanged += PizzaInListHandler;
       }

       public void PizzaInListHandler(object sender, EventArgs e)
       {
           pizzasCreatedCounterTextBox.Text = pizzaList.Count.ToString();        
       }
       public void ClearMainListChangeHandler(object sender, EventArgs e)
       {  
           pizzaList.Clear();
       }
    }

    public partial class PizzaCreatorForm : Form
    {
       public EventHandler PizzaInList;

       public Pizza Order
       {
           //Code that assigns Pizza class member variables to control values
       }

       Form1 MainForm = null;

       public PizzaCreatorForm(Form1 mForm)
       {
            InitializeComponent();
            MainForm = mForm
       }

       private void orderNewPizaaToolStripButton_Click(object sender, EventArgs e)
       {
            if(PizzaInList != null)
            {
                PizzaInList(this, new EventArgs());
            }

            MainForm.PizzaList.Add(Order);

            Order = new Pizza();
       }
    }

    public partial class PizzaOrdersListViewForm : Form
    {
       public EventHandler ClearMainList;

       Form1 mainForm = null;

       public PizzaOrdersListViewForm(Form1 TheMain)
       {
          InitializeComponent();
          mainForm = TheMain;
       }

       private void clearToolStripButton_Click(object sender, EventArgs e)
       {
          if(ClearMainList != null)
          {
              ClearMainList(this, new EventArgs());
          }
          ClearMainList += mainForm.ClearMainListChangeHandler;
          pizzaListView.Items.Clear();

       }

    }

---

我所要做的就是将PizzaOrdersListViewForm ClearMainList事件处理程序订阅到MainForm中DisplayOrdersTolsTripMenuItem\u Click方法中的自定义PizzaInListHandler方法

private void displayOrdersToolStripMenuItem_Click(object sender, EventArgs e)
{
     PizzaOrdersListViewForm orderListV = new PizzaOrdersListViewForm();
     orderListV.ClearMainList += ClearMainListChangeHandler;
     orderListV.ClearMainList += PizzaInListHandler;
}

我在比萨饼清单上发现了我的错误。当我应该选择返回列表中元素总数的计数时，我意外地使用了计数来计算每个项目的顺序