使用嵌套的ListView显示IGrouping<>-DisplayinganIGrouping<>withnestedListViews

I need to retrieve a set of Widgets from my data access layer, grouped by widget.Manufacturer, to display in a set of nested ASP.NET ListViews.

我需要从我的数据访问层检索一组Widgets，按widget.Manufacturer分组，以显示在一组嵌套的ASP.NET ListViews中。

The problem is that (as far as I can tell) the nested ListView approach requires me to shape the data before using it, and I can't figure out the best approach to take. The best I've been able to come up with so far is to put a LINQ query in my data access layer like so:

问题是（据我所知）嵌套的ListView方法要求我在使用之前对数据进行整形，我无法找出最佳方法。到目前为止，我能够提出的最好的方法是在我的数据访问层中放置LINQ查询，如下所示：

var result = from widget in GetAllWidgets(int widgetTypeID)
             group widget by widget.Manufacturer into groupedWidgets
             let widgets = from widgetGroup in groupedWidgets
                           select widgetGroup
             select new { Manufacturer = groupedWidgets.Key, Widgets = widgets };

Of course, anonymous types can't be passed around, so that doesn't work. Defining a custom class to enclose data seems like the wrong way to go. Is there some way I can perform the grouping on the ASP.NET side of things? I'm using ObjectDataSources to access the DAL.

当然，匿名类型不能传递，所以这不起作用。定义一个自定义类来封装数据似乎是错误的方法。有没有什么方法可以在ASP.NET方面执行分组？我正在使用ObjectDataSources来访问DAL。

Updated: OK, I'm not creating an anonymous type anymore, and instead my DAL passes an IEnumerable> to the ASP.NET page, but how can I use this in my ListViews? I need to render the following HTML (or something pretty much like it)

更新：好的，我不再创建匿名类型，而是我的DAL将IEnumerable >传递给ASP.NET页面，但是我如何在ListViews中使用它？我需要渲染以下HTML（或者非常类似的东西）

  
Foo Corp.
    

      
Baz
      
Quux
    
  
  
Bar Corp.
    

      
Thinger
      
Whatsit
    
  

Originally, I had a ListView within a ListView like so:

最初，我在ListView中有一个ListView，如下所示：

Note how the DataSource property of WidgetsListView is itself databound. How can I duplicate this functionality without reshaping the data?

请注意WidgetsListView的DataSource属性本身是如何数据绑定的。如何在不重塑数据的情况下复制此功能？

This is getting kind of complicated, sorry if I should have just made a separate question instead.

这有点复杂，对不起，如果我应该刚刚提出一个单独的问题。

3 个解决方案

public class CustomGroup
{
  public TKey Key {get;set;}
  public IEnumerable Values {get;set;}
}

IEnumerable> result =
  GetAllWidgets(widgetTypeId)
  .GroupBy(w => w.Manufacturer)
  .Select(g => new CustomGroup(){Key = g.Key, Values = g};

var enumerableData = myData.Tables[0].AsEnumerable();
var groupedData = enumerableData.GroupBy(x => x["GroupingColumn"]);

myParentRepeater.DataSource = groupedData;
myParentRepeater.DataBind();

  
    
<%#Eval("Key") %>
    
      
        <%#((DataRow)Container.DataItem)["ChildDataColumn1"] %>
        <%#((DataRow)Container.DataItem)["ChildDataColumn2"] %>
      
      
        

      
    
  

List myInts = new List() { 1, 2, 3, 4, 5 };
IEnumerable> myGroups = myInts.GroupBy(i => i % 2);
foreach (IGrouping g in myGroups)
{
  Console.WriteLine(g.Key);
  foreach (int i in g)
  {
    Console.WriteLine("  {0}", i);
  }
}
Console.ReadLine();

  IEnumerable> result =
    GetAllWidgets(widgetTypeId).GroupBy(w => w.Manufacturer);