字典< T>列表< T>和ASP.NET中的ListViews

我问这个问题，因为即使我已经阅读了很多ListView资源，我还没有得到。

I'm asking this question because even though I've read through a lot of ListView resources, I'm still not 'getting' it.

我有一堆 Foo 它们具有与它们相关联的项目列表（被称为 Bar ），我将它们从数据访问/业务逻辑图层作为词典保存 Foo 及其关联的栏。我想在网页上将这些项目吐出一个 ListView ，其中包含 Foo.Name 左边，右下角的列表< Bar> 。 （如下图所示）：

I have a bunch of Foo's that have a list of items associated with them (known as Bar), and I'm pulling them from the Data Access/Business Logic layer as Dictionary that holds a Foo and its associated Bars. I'd like to spit these items out in on the Webpage into a ListView that holds the Foo.Name on the left, and the List<Bar> on the right in a dropdownlist. (Shown with my beautiful ASCII art below):

------------------------------------------------------------------
|           Name Of Item          |  DropDownList (of List<T>)   |
|---------------------------------|  _____________________       |
|                foo1             |  |     bar1      | v |       |
|                                 |  |_______________|___|       |  
------------------------------------------------------------------
|                                 |  DropDownList (of List<T>)   |
|                                 |  _____________________       |
|                foo2             |  |     bar2      | v |       |
|                                 |  |_______________|___|       |
------------------------------------------------------------------

好的，这是发生了什么。这是一个ListView;这些项目从数据库被拉到 Dictionary< Foo，List< Bar> 中。我试图从字典中获取键值，显示在项目名称下，我试图获得List< T> Bar'在ListView右侧显示为DropDownList。

Alright, here's what's going on. This is a ListView; The items are pulled from a database into a Dictionary<Foo, List<Bar>>. I'm trying to get the Key Value from the dictionary to show up under 'Name of Item', and am trying to get the `List<T> Bar' to show up as a DropDownList on the right side of the ListView.

-----------------          -----------------
|   Foo         |          |  Bar          |
-----------------          -----------------
|  Id           |          |  ItemName     |
|  Name         |          |  ItemValue    |
|  BarID        |          |               |
-----------------          -----------------

所以要回顾一下，我想将Dictionary.KeyName放在ListView的左侧，并将Dictionary.Value（恰好是一个列表）放在一个DropdownList上右边。

So to recap, I want to place the Dictionary.Key "Name" into the left side of the ListView, and the Dictionary.Value (which happens to be a list) into a DropdownList on the right side.

所以，对于每个Key / Value对，都会有一个名称和一个下拉列表，可以容纳每个Key的价值。

So that, for every Key/Value pair, there'd be a Name and a dropdown list that would house each Key's Value.

但我遇到问题（显然），希望有人能告诉我我在做错什么。

But I'm running into problems (obviously), and am hoping someone can tell me what I'm doing wrong.

  protected Dictionary<Foo, List<Bar>> FooDictionary
        {
            get; 
            set; 
        }

protected void DataBindFooList(List<int> SelectedFoos)
        {
            System.Web.UI.WebControls.ListView lv = lvFooList;

try
            {
                Dictionary<Foo, List<Bar>> fooDictionary =
                    new Dictionary<Foo, List<Bar>>();

                foreach (int Foo in SelectedFoos)
                {
                 // Build List of Foos to add as Dictionary.Keys
                 fooDictionary.Add(fooScalar, Bar)                     
                }
                FooDictionary = fooDictionary;
                lv.DataSource = FooDictionary;
                lv.DataBind();
                ddlListOfBars.DataSource = FooDictionary;
                ddlListOfBars.DataValueField = "ItemValue";
                ddlListOfBars.DataTextField = "ItemName";
                ddlListOfBars.DataBind();
            }
            catch (Exception ex)
            {
                SetMessage(divFooMsg, "Unable to retrieve Foos: " + 
                ex.Message, true, true);
            }

ListView代码：

The ListView Code:

<asp:ListView ID="lvFooList" runat="server">
   <LayoutTemplate>
      <asp:PlaceHolder runat="server" ID="itemPlaceholder"></asp:PlaceHolder>
   </LayoutTemplate>
      <ItemSeparatorTemplate>
         <hr />
      </ItemSeparatorTemplate>
   <ItemTemplate>
      <%#Eval("Name") %>
      <asp:DropDownList ID="ddlListOfBars" runat="server"></asp:DropDownList>
    </ItemTemplate>
   </asp:ListView>

问题：

The Question(s):

1. 可以用这种方式使用字典吗？


2. 任何指向我出错的指针？ （资源，提示等）将有帮助）


3. 有更好的方法吗？


4. 如果这个问题是泥泞的话，请评论，所以我可以弄清楚如何改善它。

1. Is it possible to use a Dictionary in this way?
2. Any pointers on where I'm going wrong? (Resources, hints, etc. would help)
3. Is there a better way to do this?
4. If this question is clear as mud, please comment so I can figure out how to improve it.