Question

我很难弄清楚如何将数据从数据库绑定到ViewModel。基本上，我有一个域模型，我发现它有太多的属性，我想减少逻辑上我选择ViewModel这样做。

域模型（从数据库自动创建）：

public partial class Ticket
{
    public Ticket()
    {
        this.Daily = new HashSet<Daily>();
        this.Ticket1 = new HashSet<Ticket>();
    }

    public int idTicket { get; set; }
    public Nullable<int> idNadredeniTicket { get; set; }
    public short RedniBroj { get; set; }
    public int idFirma { get; set; }
    public Nullable<int> idKontakt { get; set; }
    public Nullable<int> idManager { get; set; }
    public string Tip { get; set; }
    public string Status { get; set; }
    public Nullable<System.DateTime> DatumPrijave { get; set; }
    public string VrstaPrijave { get; set; }
    public string Prioritet { get; set; }
    public Nullable<System.DateTime> DatumDo { get; set; }
    public string Opis { get; set; }
    public string Biljeske { get; set; }
    public Nullable<bool> Zatvoren { get; set; }
    public Nullable<bool> IzdanRacun { get; set; }
    public Nullable<System.DateTime> DatumZatvaranja { get; set; }
    public Nullable<int> idAsset { get; set; }

    public virtual ICollection<Daily> Daily { get; set; }
    public virtual Firma Firma { get; set; }
    public virtual Kontakt Kontakt { get; set; }
    public virtual Kontakt Kontakt1 { get; set; }
    public virtual ICollection<Ticket> Ticket1 { get; set; }
    public virtual Ticket Ticket2 { get; set; }
}

视图模型：

public class OpenTickets
{
    public int idTicket { get; set; }
    public Nullable<int> idNadredeniTicket { get; set; }
    public short RedniBroj { get; set; }
    public int idFirma { get; set; }
    public Nullable<int> idKontakt { get; set; }
    public Nullable<int> idManager { get; set; }
    public string Tip { get; set; }
    public string Status { get; set; }
    public Nullable<System.DateTime> DatumPrijave { get; set; }
    public string VrstaPrijave { get; set; }
    public string Prioritet { get; set; }
    public string Opis { get; set; }
    public string Biljeske { get; set; }

    public string BrojTicketa
    {
        get
        {
            return idNadredeniTicket.ToString() + "-" + RedniBroj.ToString();
        }
    }
    public string NazivTicketa
    {
        get
        {
            return BrojTicketa + " - " + Opis;
        }
    }
    public string DetaljiTicketa
    {
        get
        {
            return Opis + "\r\n" + Biljeske;
        }
    }
}

我想要完成的是通过查询将数据从数据库绑定到ViewModel，但理解上，我收到有关传递给View的不同类型对象的错误。我正在发布控制器和视图作为参考。

控制器

    public ActionResult OpenTickets()
    {
        var openTickets = db.Ticket
            .Where(t => t.idFirma == 1)
            .Where(t => t.Zatvoren == false);

        return View(openTickets.ToList());
    }

查看（为简洁起见，故意省略某些代码）

@model IEnumerable<IDE3_CRM.ViewModels.OpenTickets>

<table>
    @foreach (var item in Model)
    {
        <tr>
            <td>@Html.DisplayFor(modelItem => item.Biljeske)</td>
            <td>@Html.DisplayFor(modelItem => item.Opis)</td>
        </tr>
    }
</table>

Answer 1

我建议在Repository中包装您的数据库调用。在这里，您可以将数据库对象转换为视图模型。例如：

public ActionResult OpenTickets()
{
    var openTickets = ticketRepo.GetOpenTickets();
    return View(openTickets);
}

// Implementation of ITicketRepo
public IEnumerable<OpenTickets> GetOpenTickets()
{
    return db.Ticket
        .Where(t => t.idFirma == 1 && t.Zatvoren == false)
        .Select(do => new OpenTickets
        {
            // Fill in view model properties from database object
        });
}

Answer 2

Hrvach，

您可以限制视图本身的数据字段，我认为可能更有效。这里说的是另一种方法：

创建OpenTickets类型列表
选择您想要的门票
循环选定的故障单并添加一个新的openTicket 您希望保留在openTickets列表中的专业人员

返回打开的门票列表

public ActionResult OpenTickets()
{


    List<OpenTickets> openTicketList = new List<OpenTickets>();//create a list of openTickets

    var Tickets = db.Ticket//select the tickets that you want
        .Where(t => t.idFirma == 1)
        .Where(t => t.Zatvoren == false);

    foreach (var ticket in Tickets)//Loop over the tickets and create an openTicket out of each ticket then add the openTick to the openTicketList
    {
        OpenTickets openTicket = new OpenTickets();//create new OpenTickets object
        openTicket.propery1 = ticket.propery1;//set each property of the openTicket equal to the property of the Ticket that you want to keep
        openTicket.propery2 = ticket.propery2;
        openTicket.propery3 = ticket.propery3;
        openTicket.propery4 = ticket.propery4;
        openTicketList.Add(openTicket);//add new OpenTickets object to the list
    }
    return View(openTicketList);
}

我希望这会有所帮助...祝福比尔

将域模型类型的数据绑定到ViewModel类型

2 个答案: