c# - 如何在要打印的收据上添加选定的 ListBox 项目及其价格？

Question

我将 ListBox 与本地数据库中的一个表连接起来，该表有两列:
名称和价格。

我想发送从 ListBox 中选择的 Item。 Item 的名称和价格应添加到下一个所选 Item 的价格中，并且应打印收据。

我该怎么做？

Answer 1

您将不得不添加更多逻辑以满足您的特定需求，但下面的代码应该作为实现您想要完成的目标的通用方法。

    public class DBRowObject { // The object that will be stored in the "DataSource" of the ComboBox
        public int iPrice = 0;
        public string strName = "";

        public DBRowObject(int price, string name) {
            iPrice = price;
            strName = name;
        }

        public override string ToString() // This means the combo box will display the name
        {
            return strName;
        }

    }

    public Form1()
    {
        InitializeComponent();
        List<DBRowObject> lsRows = new List<DBRowObject>(){new DBRowObject(3,"Bob"),new DBRowObject(2,"Sam"),new DBRowObject(5,"John")};
        this.cbCombo.DataSource = lsRows;
    }
    public DBRowObject prevSelected = null;
    private void cbCombo_SelectedValueChanged(object sender, EventArgs e)
    {
        DBRowObject dbrCurr = (DBRowObject)cbCombo.SelectedItem;

        if (prevSelected != null) {
            dbrCurr.iPrice += prevSelected.iPrice;
        }

        // TODO Display information about these objects and perform various other tasks

        prevSelected = dbrCurr;
    }