在asp.net MVC中对表进行排序

Question

我想知道人们如何在asp.net mvc中对表进行排序？我听说过javascript解决方案非常适用于非分页表,例如jquery的表分类器,但我需要一个可以处理分页表的解决方案.

我正在研究的项目目前使用以下解决方案,但我发现它非常混乱.

调节器

public ActionResult Sort(string parameter)
{  

 IEnumerable<IProduct> list;

 if (Session["Model"] != null)
  list = (IEnumerable<IProduct>)Session["Model"]).ToList<IProduct>();
 else
  list = _service.GetAll();

 if (Session["parameter"] == null && Session["sortDirection"] == null)
 {
  //set the parameter and set the sort to desc
  Session["parameter"] = parameter;
  Session["sortDirection"] = "DESC";
 }
 else if (Session["parameter"] != null) //already set so not the first time
 {
  //same parameter sent
  if (Session["parameter"].ToString().Equals(parameter))
  {
   //check sort direction and reverse
   if (Session["sortDirection"].ToString().Equals("DESC"))
    Session["sortDirection"] = "ASC";
   else
    Session["sortDirection"] = "DESC";
  }
  else //different parameter sent
  {
   Session["sortDirection"] = "DESC";
   Session["parameter"] = parameter;
  }
 }

 if (Session["sortDirection"].CompareTo("ASC") == 0)
  list = Models.ContollerHelpers.SortingHelper.OrderBy(list.AsQueryable(), column);
 else
  list = Models.ContollerHelpers.SortingHelper.OrderByDescending(list.AsQueryable(), column);

 return View("Results", list.ToList);
}

帮手

public class Helper()
{
 private static IOrderedQueryable<T> OrderingHelper<T>(IQueryable<T> source, string propertyName, bool descending, bool anotherLevel)
 {
  ParameterExpression param = Expression.Parameter(typeof(T), string.Empty); // I don't care about some naming
  MemberExpression property = Expression.PropertyOrField(param, propertyName);
  LambdaExpression sort = Expression.Lambda(property, param);

  MethodCallExpression call = Expression.Call(
   typeof(Queryable),
   (!anotherLevel ? "OrderBy" : "ThenBy") + (descending ? "Descending" : string.Empty),
   new[] { typeof(T), property.Type },
   source.Expression,
   Expression.Quote(sort));

  return (IOrderedQueryable<T>)source.Provider.CreateQuery<T>(call);
 }

 public static IOrderedQueryable<T> OrderBy<T>(this IQueryable<T> source, string propertyName)
 {
  return OrderingHelper(source, propertyName, false, false);
 }

 public static IOrderedQueryable<T> OrderByDescending<T>(this IQueryable<T> source, string propertyName)
 {
  return OrderingHelper(source, propertyName, true, false);
 }

 public static IOrderedQueryable<T> ThenBy<T>(this IOrderedQueryable<T> source, string propertyName)
 {
  return OrderingHelper(source, propertyName, false, true);
 }

 public static IOrderedQueryable<T> ThenByDescending<T>(this IOrderedQueryable<T> source, string propertyName)
 {
  return OrderingHelper(source, propertyName, true, true);
 }
}

列表显示

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<IEnumerable<Models.Interface.IProduct>>" %>
<% Session["model"] = Model; %>
 <table>
    <tr>
   <th>
    Edit Details
   </th>
   <th>
    <%=Html.ActionLink("Id","Sort",new {parameter ="Id"}) %>
   </th>
   <th>
    <%=Html.ActionLink("Name", "Sort", new { parameter = "Name"})%>
   </th>
   <th>
    <%=Html.ActionLink("Status", "Sort", new { parameter = "Status" })%>
   </th>
   <th>
    <%=Html.ActionLink("Notes", "Sort", new { parameter = "Notes"})%>
   </th>
  </tr>
  <% foreach (var item in Model){ %>

   <tr>
    <td>
     <%= Html.ActionLink("Edit", "Edit", new {  id=item.Id }) %> |
    </td>
    <td>
     <%= Html.Encode(item.Id) %>
    </td>
    <td>
     <%= Html.Encode(item.Name) %>
    </td>
    <td>
     <%= Html.Encode(item.Status) %>
    </td>
    <td>
     <%= Html.Encode(item.Notes) %>
    </td> 
   </tr>

  <% } %>   
    </table>

这是做这样事情的唯一方法吗？如果有人知道一种更好的方式,不涉及将所有记录一次性加载到页面,那么请链接到示例.

Answer 1

查看DataTables @ DataTables这将允许您分页结果并通过简单的设置进行查询.它适用于ajax和json数据.看看样品.希望这会帮助你.

Answer 2

尝试以下扩展方法(从头顶):

static class OrderByExtender
{
    public static IOrderedEnumerable<T> OrderBy<T>(this IEnumerable<T> collection, string key, string direction)
    {
        LambdaExpression sortLambda = BuildLambda<T>(key);

        if(direction.ToUpper() == "ASC")
            return collection.OrderBy((Func<T, object>)sortLambda.Compile());
        else
            return collection.OrderByDescending((Func<T, object>)sortLambda.Compile());
    }

    public static IOrderedEnumerable<T> ThenBy<T>(this IOrderedEnumerable<T> collection, string key, string direction)
    {
        LambdaExpression sortLambda = BuildLambda<T>(key);

        if (direction.ToUpper() == "ASC")
            return collection.ThenBy((Func<T, object>)sortLambda.Compile());
        else
            return collection.ThenByDescending((Func<T, object>)sortLambda.Compile());
    }

    private static LambdaExpression BuildLambda<T>(string key)
    {
        ParameterExpression TParameterExpression = Expression.Parameter(typeof(T), "p");
        LambdaExpression sortLambda = Expression.Lambda(Expression.Convert(Expression.Property(TParameterExpression, key), typeof(object)), TParameterExpression);
        return sortLambda;
    }
}

用法:

var products = Session["Model"] as IEnumerable<Product>() ?? _service.GetAll();

return products.OrderBy("Name", "ASC").ThenBy("Price", "DESC");

假设您一次只使用1个orderby条件,您可以使用:

var products = Session["Model"] as IEnumerable<Product>();

var sortDirection = Session["Direction"] as string ?? "DESC";
Session["Direction"] = sortDirection == "DESC" ? "ASC" : "DESC";
sortDirection = Session["Direction"] as string;

return products.OrderBy(parameter, sortDirection);

Answer 3

我更喜欢这里描述的方法： http://www.c-sharpcorner.com/UploadFile/camurphy/csharpLists03302006170209PM/csharpLists.aspx

所以对于前：

var products = new List<Products>();
products = ProductRepository.GetAll();

// Sort Results
products.Sort(
    delegate(Products p1, Products p2) {
    return p1.Name.CompareTo(p2.Name);
});