EF + MVC3：如何在頁面模型爲IPagedList時創建DropDownList過濾器？

我一直在關注從asp.net的優秀教程有關創建分頁和過濾：http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/sorting-filtering-and-paging-with-the-entity-framework-in-an-asp-net-mvc-application EF + MVC3：如何在頁面模型爲IPagedList時創建DropDownList過濾器？

我現在想用一個下拉列表，將過濾我的項目添加其他過濾器。我發現另一個關於這個教程，並遵循它：http://chikkanti.wordpress.com/2012/04/30/dropdownlist-based-filtering-in-mvc-3-using-entityframeworkedm-modalfirst-method/

但是，當我運行它時，我得到了關於下拉列表不是IEnumerable類型的錯誤。這是有意義的，因爲頁面模型是IPagedList類型的。如何添加一個下拉列表過濾器到頁面模型IPagedList的頁面？

控制器：

 public ActionResult SearchNames(string ddlcontent, int? page) 
    { 
     int pageSize = 10; 
     int pageNumber = (page ?? 1); 
     var list = new List<string>(); 
     var nameqry = from n in db.tblProjects 
         select n.ProjectName; 
     list.AddRange(nameqry.Distinct()); 
     ViewBag.ddlcontent = new SelectList(list); 
     //var names = from m in db.tblProjects 
     //   select m; 
     var tbldefectdetails = db.tblDefectDetails.Include(t => t.tblBugLocation).Include(t => t.tblBugType).Include(t => t.tblBusinessUnit).Include(t => t.tblDefectDiscoveryMethod).Include(t => t.tblProject).Include(t => t.tblLanguage); 
     if (!string.IsNullOrEmpty(ddlcontent)) 
      { 
       tbldefectdetails = tbldefectdetails.Where(s => s.tblProject.ProjectName.ToUpper().Contains(ddlcontent.ToUpper())); 
      } 
     return View(tbldefectdetails.ToPagedList(pageNumber, pageSize)); 
    }

DROPDOWNLIST在查看：

@model PagedList.IPagedList<EDTToolMVC.Models.tblDefectDetail> 

@{ 
    ViewBag.Title = "Early Defect Tracking Tool - Home"; 
} 

<h2>SearchNames</h2> 
@using (@Html.BeginForm(「SearchNames」, 「Names」, FormMethod.Get)) 
{ 
@Html.DropDownList(「ddlcontent」, 「All」)<input type=」submit」 value=」Filter」 />; 
}

IPagedList：

namespace PagedList 
{ 
// Summary: 
//  Represents a subset of a collection of objects that can be individually accessed 
//  by index and containing metadata about the superset collection of objects 
//  this subset was created from. 
// 
// Type parameters: 
// T: 
//  The type of object the collection should contain. 
// 
// Remarks: 
//  Represents a subset of a collection of objects that can be individually accessed 
//  by index and containing metadata about the superset collection of objects 
//  this subset was created from. 
public interface IPagedList<out T> : IPagedList, IEnumerable<T>, IEnumerable 
{ 
    // Summary: 
    //  Gets the number of elements contained on this page. 
    int Count { get; } 

    // Summary: 
    //  Gets the element at the specified index. 
    // 
    // Parameters: 
    // index: 
    //  The zero-based index of the element to get. 
    T this[int index] { get; } 

    // Summary: 
    //  Gets a non-enumerable copy of this paged list. 
    // 
    // Returns: 
    //  A non-enumerable copy of this paged list. 
    IPagedList GetMetaData(); 
} 
}

來源

2012-07-11 bearaman

修改視圖模型，使其包含您的下拉列表中的元素。或從IPagedList繼承。

class MyViewModel<T>{ 
    public IPagedList<T> Model {get;set;} 
    public IList<something> DropdownElements {get;set;} 
}

還是要使其可重複使用，創造一個基礎視圖模型，或基本視圖類，你的ViewModels，或瀏覽繼承包含功能實現公共可重用「服務」是這樣的。

來源

2012-07-11 09:06:45

EF + MVC3：如何在頁面模型爲IPagedList時創建DropDownList過濾器？

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