如何在eventdb.cs中获取我的方法以在我的主窗体中填充我的组合框?

时间:2013-04-25 07:09:48

标签: c#

我有一个名为EventDB.cs的类,用于从文本文件中获取数据。我将每5行输入作为一个名为events的对象列表,但是在尝试将列表填充到我的主窗体上的组合框中时遇到了麻烦。有人能指出我做错了什么吗?这是我的Event.cs,EventDB.cs和main ticketinfo.cs的代码。提前谢谢!

Event.cs

namespace TicketInformation
{
  public class Event
{
  public Event()
  {
  }

  public Event(int day, string time, double price, string strEvent, string description)
  {
     this.Day = day;
     this.Time = time;
     this.Price = price;
     this.StrEvent = strEvent;
     this.Description = description;
  }

  public int Day { get; set; }

  public string Time { get; set; }

  public double Price { get; set; }

  public string StrEvent { get; set; }

  public string Description { get; set; }

  public string GetDisplayText()
  {
     return StrEvent;
  }

  }
}

EventDB.cs

namespace TicketInformation
{
public static class EventDB
{
  private static string dir = Directory.GetCurrentDirectory();
  private static string path = dir + "\\calendar.txt";


  public static List<Event> ExtractData() //(DateTime dtmDay)
  {
     //int intChosenDay = dtmDay.Day;

     // create object for input stream for text file
     StreamReader textIn =
    new StreamReader(
    new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read));

     //create the list
     List<Event> events = new List<Event>();



     string[] lines = File.ReadAllLines(path);

     for (int index = 4; index < lines.Length; index += 5)
     {
        Event special = new Event();
        special.Day = Convert.ToInt32(lines[index - 4]);
        special.Time = (lines[index - 3]);
        special.Price = Convert.ToDouble(lines[index - 2]);
        special.StrEvent = lines[index - 1];
        special.Description = lines[index];
        events.Add(special);
     }


     //close stream for the text file
     textIn.Close();

     return events;

  }

  }
  }

Ticketinfo.cs

static void Main()
  {
     Application.Run(new FrmEvents());
  }

  private List<Event> events = null;


  private void FrmEvents_Load(
     object sender, System.EventArgs e)
  {
     CreateEventList();

  } 

  private void CreateEventList()
  {

     EventDB.ExtractData(events); //(mvwDate.SelectionStart);

     cboEvent.Items.Clear();

     foreach (Event e in events)
     {
        cboEvent.Items.Add(e.GetDisplayText());
     }


  } //end method CreateEventList

2 个答案:

答案 0 :(得分:0)

我认为你在Ticketinfo.cs中的CreateEventList()方法中犯了错误。您根本不更新Ticketinfo.cs中的events,您将始终为空列表。你应该换行

EventDB.ExtractData(events);

events = EventDB.ExtractData();

然后应该工作正常。现在你的方法将从文件中返回事件。

你的新方法应该是这样的:

 private void CreateEventList()
  {

     events = EventDB.ExtractData(); //(mvwDate.SelectionStart);

     cboEvent.Items.Clear();

     foreach (Event e in events)
     {
        cboEvent.Items.Add(e.GetDisplayText());
     }


  } //end method CreateEventList

答案 1 :(得分:0)

如果您想要显示所选日期之前或之后的事件,您可以执行以下操作:

首先,您需要Events课程中的实际日期 - 您有一天和一个时间,但我没有看到日期。因此,为了这个例子,我们只使用Day属性。

您可以非常轻松地根据所选的Day LINQ将事件列表绑定到组合框:

private void CreateEventList()
{

    events = EventDB.ExtractData(); //(mvwDate.SelectionStart);

    var e = (from ev in events
             where ev.Day >= mvwDate.SelectionStart  // mvwDate.SelectionStart needs to be an int
             select ev).ToList();

    cboEvent.Items.Clear();

    cboEvent.DisplayMember = "StrDesc";
    // You could also assign a ValueMember like this:
    //cboEvent.ValueMember = "Day";
    cboEvent.DataSource = e;
} //end method CreateEventList

在我的示例中有一些假设(主要是mvwDate.SelectionStart是什么),我还没有测试过代码,但这应该会给你另一种方法。