如何最好地处理我的应用程序中的数据

Question

正在开发用于工资单的 C# 应用程序。作为警告，我对这一切都很陌生，只是被投入其中并享受它，但在短时间内吸收了很多东西。我目前正在学习 LINQ 和课程。我正在从我们的帐户 SQL 服务器中获取发票行，并根据销售额和可以从数据中确定的某些情况向人员付款。请参阅下面的示例：

Ord_Inv_No      Delivery_Date       Trmnl_Key   TrmnlGrp_Key
INV-00059754    2016-05-02 07:00:00 23          3
INV-00059839    2016-05-02 16:01:00 56          3

这是数据的一小部分，但它提供了我想要分析的要点。我有一个类如下所示：

class SalesItem
{

    public string DriverName { get; set; }
    public DriverData DriverData { get; set; }
    public int TerminalKey { get; set; }
    public int TerminalGroupKey { get; set; }
    public string DeliveryDate { get; set; }
    public string CustomerLocation { get; set; }
    public int? CustomerLocationKey { get; set; }
    public bool? IsCredited { get; set; }
    public string InvoiceNumber { get; set; }
    public string TermianlGroupDesc { get; set; }

    public SalesItem(string driverName, int terminalKey, int terminalGroupKey, string deliveryDate, 
        string customerLocation, int? customerLocationKey, bool? isCredited, string invoiceNumber, string terminalGroupDesc)
    {
        this.DriverName = driverName;
        this.TerminalKey = terminalKey;
        this.TerminalGroupKey = terminalGroupKey;
        this.DeliveryDate = deliveryDate;
        this.CustomerLocation = customerLocation;
        this.CustomerLocationKey = customerLocationKey;
        this.IsCredited = isCredited;
        this.InvoiceNumber = invoiceNumber;
        this.TermianlGroupDesc = terminalGroupDesc;
    }

我正在尝试实现一种方法，我可以 1. 将每个 SalesItem（每一行）存储为一个集合，因为没有更好的词。我想遍历SalesItem 的集合并找出一些事情，例如当发票行出现两次时，不同的Trmnl_Key 和两个不同的Ord_Inv_No 彼此具有完全相同的日期并返回两人的薪酬最高。我为此编写了一些逻辑，它正在处理我正在通过 SQLConnection/Command/Reader/Etc 获取的DataTable，但是在处理一周的数据时，所有这些都非常缓慢和繁琐，而且我无法进行比较可靠地工作。更进一步，这些行将在 WPF 中的 DataGrid 中标记，以便在会计软件出现异常情况时人工验证他们的工资。

现在，我正在尝试保存集合，如下所示（这只是当前的迭代，我有几天的尝试失败了。）

 private void GetInformation(object sender, SelectionChangedEventArgs e)
    {
        ComboBox currentItem = sender as ComboBox;
        int driverKey = Convert.ToInt32(currentItem.SelectedValue);
        DriverData driver = new DriverData();
        driver.SetDriverData(driverKey);
        int years = driver.ServiceYears;
        List<SalesItem> items =  (from o in transportationDb._Payroll_Orders
                                 where o.Ord_Driver_Key == driverKey &&
                                 o.Delivery_Date >= new DateTime(2016, 5, 2) && o.Delivery_Date <= new DateTime(2016, 5, 8)
                                 select new SalesItem(
                                     o.Driver_Name,
                                     o.Trmnl_Key,
                                     o.TrmnlGrp_Key,
                                     o.Delivery_Date.ToString(),
                                     o.CustLoc_Description,
                                     o.Ord_CustLoc_Key,
                                     o.Credits, o.Ord_Inv_No, o.TrmnlGrp_Description )).ToList();


        dataGrid.ItemsSource = items;

    }

任何智慧或方向将不胜感激

Answer 1

当然，这与您所拥有的并没有太大不同，但请尝试一下，看看它是否适合您：

private void GetInformation(object sender, SelectionChangedEventArgs e)
{
    ComboBox currentItem = sender as ComboBox;
    int driverKey = Convert.ToInt32(currentItem.SelectedValue);
    DriverData driver = new DriverData();  //What's this for?
    driver.SetDriverData(driverKey); //What's this for?
    int years = driver.ServiceYears; //What's this for?
    var startDate=new DateTime(2016, 5, 2);
    var endDate=new DateTime(2016, 5, 8);
    var items = transportationDb._Payroll_Orders
      .Where(o=>o.Ord_Driver_Key == driverKey)
      .Where(o=>o.Delivery_Date >= startDate && o.Delivery_Date <= endDate)
      .Select(o=>new SalesItem {
        DriverName=o.Driver_Name,
        ...
      });
    dataGrid.ItemsSource = items;
}

如果您的 Orders 表在 Ord_Driver_key 和 Delivery_Date 上有一个索引，那么这个查询应该很快。

Answer 2

我希望这在某种程度上有所帮助。我不太确定您要达到的目标。保存功能可能如下所示，但我不知道您使用的是哪种连接。请注意，我正在检查以确保记录不存在。

 private void Save(SalesItem item)
    {
        if(!transportationDb._Payroll_Orders.Any(p => p.Ord_Inv_No == item.InvoiceNumber))
        {
            transportationDb._Payroll_Orders.Add(item.PayrollOrder);
            transportationDb.SaveChanges();
        }
        else
        {
            // Already exists
        }
    }

将您的课程更新为您想要的任何方式，但由于对您的对象应该是什么样子的有限了解，我会这样做。

class SalesItem
{

    public SalesItem(_Payroll_Orders po == null, DriverData dd == null)
    {
        this._Payroll_Order = po != null ? po : new _Payroll_Orders();
        this.DriverData = dd != null ? dd : new DriverData();
    }

    private _Payroll_Orders _Payroll_Order { get; set; }

    public _Payroll_Orders PayrollOrder
    {
        get { return _Payroll_Order; }
        set { _Payroll_Order = value; }
    }

    public string DriverName 
    {
        get { return _Payroll_Order.Driver_Name; }
        set { _Payroll_Order.Driver_Name= value; }
    }
    public DriverData DriverData { get; set; }
    public int TerminalKey 
    {
        get { return _Payroll_Order.Trmnl_Key; }
        set { _Payroll_Order.Trmnl_Key= value; }
    }
    public int TerminalGroupKey 
    {
        get { return _Payroll_Order.TrmnlGrp_Key; }
        set { _Payroll_Order.TrmnlGrp_Key= value; }
    }
    public DateTime DeliveryDate 
    {
        get { return _Payroll_Order.Delivery_Date; }
        set { _Payroll_Order.Delivery_Date= value; }
    }
    public string CustomerLocation 
    {
        get { return _Payroll_Order.CustLoc_Description; }
        set { _Payroll_Order.CustLoc_Description = value; }
    }
    public int? CustomerLocationKey 
    {
        get { return _Payroll_Order.Ord_CustLoc_Key; }
        set { _Payroll_Order.Ord_CustLoc_Key = value; }
    }
    public bool? IsCredited 
    {
        get { return _Payroll_Order.Credits; }
        set { _Payroll_Order.Credits = value; }
    }
    public string InvoiceNumber 
    {
        get { return _Payroll_Order.Ord_Inv_No; }
        set { _Payroll_Order.Ord_Inv_No = value; }
    }
    public string TermianlGroupDesc 
    {
        get { return _Payroll_Order.TrmnlGrp_Description; }
        set { _Payroll_Order.TrmnlGrp_Description = value; }
    }
}

那么你可以在这里改变你的功能，所以你只需要选择'new SalesItem(o, driver)'：

 private void GetInformation(object sender, SelectionChangedEventArgs e)
    {
        ComboBox currentItem = sender as ComboBox;
        int driverKey = Convert.ToInt32(currentItem.SelectedValue);
        DriverData driver = new DriverData();
        driver.SetDriverData(driverKey);
        int years = driver.ServiceYears;
        List<SalesItem> items =  (from o in transportationDb._Payroll_Orders
                                 where o.Ord_Driver_Key == driverKey &&
                                 o.Delivery_Date >= new DateTime(2016, 5, 2) &&
                                 o.Delivery_Date <= new DateTime(2016, 5, 8)
                                 select new SalesItem(o, driver)).ToList();

        dataGrid.ItemsSource = items;

    }