如何將viewmodel傳遞給PagedList

這裏有一個完整的初學者在C＃MVC中需要一些幫助。我堅持將viewmodel數據傳遞給PagedList。我在做什麼錯？在控制器中，我得到錯誤消息：如何將viewmodel傳遞給PagedList

無法隱式轉換類型「PagedList.IPagedList」到「PagedList.IPagedList」。存在明確的轉換（您是否缺少演員？）

我已經檢查了很多關於此主題的其他帖子，但無法解決我的問題。

這裏是我的視圖模型：

public partial class NaloziViewModel 
{ 
    public int IDNalozi { get; set; } 
    public int KlijentID { get; set; } 

    [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy HH:mm}", ApplyFormatInEditMode = true)] 
    public DateTime VremeStart { get; set; } 

    [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy HH:mm}", ApplyFormatInEditMode = true)] 
    public DateTime? VremeKraj { get; set; } 

    public int KilometrazaStart { get; set; } 
    public int? KilometrazaKraj { get; set; } 
    public virtual Klijent Klijent { get; set; } 
    public int? Page { get; set; } 
}

Pagedclass

public class Pagedclass 
{ 
    public PagedList.IPagedList<NaloziViewModel> mylist { get; set; } 
    public int KilometrazaSum { get; set; } 
    public int VremeSum { get; set; } 
}

控制器：

public ActionResult Index(int? page, DateTime? dateFrom, DateTime? dateTo, string klijentIme) 
{ 
    int pageSize = 10; 
    int pageNumber = (page ?? 1); 
    var naloziFilter = db.Nalozis.Include(n => n.Klijent).OrderByDescending(n => n.IDNalozi).Where(n => n.Obrisan == 0).ToPagedList(pageNumber,pageSize); 

    if (dateFrom != null && dateTo != null) 
    { 
     naloziFilter = naloziFilter.Where(n => n.Klijent.NazivKlijenta.Contains(klijentIme)).Where(n => n.VremeStart >= dateFrom).Where(n => n.VremeKraj <= dateTo).ToPagedList(pageNumber,pageSize); 
     TimeSpan vremeSum = new TimeSpan(); 
     naloziFilter.Where(x => x.VremeKraj.HasValue).ToList().ForEach(x => vremeSum += x.VremeKraj.Value - x.VremeStart); 

     var model = new Pagedclass 
     { 
      mylist = naloziFilter, 
      KilometrazaSum = naloziFilter.Sum(n => n.KilometrazaKraj ?? 0) - naloziFilter.Sum(n => n.KilometrazaStart), 
      VremeSum = (vremeSum.Days*24)+vremeSum.Hours, 

     }; 
     return View(model); 
    } 
    else 
    { 
     TimeSpan vremeSum = new TimeSpan(); 
     naloziFilter.OrderByDescending(n => n.IDNalozi).Where(n => n.Obrisan == 0).Where(x => x.VremeKraj.HasValue).ToList().ForEach(x => vremeSum += x.VremeKraj.Value - x.VremeStart); 

     var model = new Pagedclass 
     { 
      mylist = naloziFilter, 
      KilometrazaSum = naloziFilter.Sum(n => n.KilometrazaKraj ?? 0) - naloziFilter.Sum(n => n.KilometrazaStart), 
      VremeSum = (vremeSum.Days * 24) + vremeSum.Hours 
     }; 
     return View(model); 
    } 
}

筆者認爲：

@model Pagedclass 

@using PagedList; 

@using PagedList.Mvc; 

....

來源

2014-10-27 Vladimir Djordjevic

你從上查詢回收集'db.Nalozis'是'Nalozi'不是'NaloziViewModel'的集合。您需要將這些項目投影到'NaloziViewModel'。 – Jasen 2014-10-27 21:17:10

@Jasen 你能幫我解決這個問題嗎？不知道應該怎麼做。 – 2014-10-28 08:24:17

[這個問題的答案]（http://stackoverflow.com/a/5392180/2030565）有一個投影的例子。該問題詢問[AutoMapper]（https://github.com/AutoMapper/AutoMapper/wiki/Getting-started），這是一個幫助您處理這些投影的工具，因此您無需重複輸入這些內容。 – Jasen 2014-10-28 17:46:17

不使用自動映射器的基本版本，是將您的Linq更改爲返回所需的對象類型（通過在select子句中將其更新）：

例如，更改此設置：

naloziFilter.OrderByDescending(n => n.IDNalozi) 
     .Where(n => n.Obrisan == 0) 
     .Where(x => x.VremeKraj.HasValue).ToList().ForEach(x => vremeSum += x.VremeKraj.Value - x.VremeStart);

到財產以後這樣的：

naloziFilter.OrderByDescending(n => n.IDNalozi) 
     .Where(n => n.Obrisan == 0) 
     .Where(x => x.VremeKraj.HasValue) 
     .Select(x=> new NaloziViewModel(){ 
      IDNalozi = x.IDNalozi, 
      KlijentID = x.KlijentID, 
      VremeStart = x.VremeStart, 
      VremeKraj = x.VremeKraj, 
      KilometrazaStart = x.KilometrazaStart, 
      KilometrazaKraj = x.KilometrazaKraj, 
      Klijent = x.Klijent, 
      Page = x.Page 
     }) 
     .ToList().ForEach(x => vremeSum += x.VremeKraj.Value - x.VremeStart);

來源

2014-11-13 17:04:53

如何將viewmodel傳遞給PagedList

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