按对象列表中的项目分组（Sitecore 项目）并与 Repeater 绑定

Question

抱歉，描述太长了，但我想让用户更容易理解我的问题。我有一个包含 DepartmentItem 和 EmployeeItem 的列表。

 var empSubRelList = new List<EmpDeptRel>();

internal class EmpDeptRel
{
    public Item DepartmentItem { get; set; }
    public Item EmployeeItem { get; set; }
}

下面是解释我如何向列表中添加项目的代码：

Item userProfile = Sitecore.Context.Database.GetItem("/sitecore/content/Intranet/User Profiles");

foreach (var subRelItem in userProfile.Axes.GetDescendants().Where(p => p.TemplateID.ToString() == Settings.GetSetting("SubRelTemplateID")
                                                  && p["Subsidiary"] == SubssdiaryItem.ID.ToString()).OrderBy(p => p["Department"]))
{
    empSubRelList.Add(new EmpDeptRel
    {
         DepartmentItem = GetItemById(subRelItem["Department"]),
         EmployeeItem = subRelItem.Parent.Parent
    });       
}

我用中继器绑定：

repEmployees.DataSource = empSubRelList;
repEmployees.DataBind();

<asp:Repeater runat="server" ID="repEmployees">
   <ItemTemplate>
       <li>
            <%# Name(Eval("DepartmentItem") as Item)%>
            <%# Name(Eval("EmployeeItem") as Item)%>          
       </li>
   </ItemTemplate>

这是中继器内部的方法“Name()”的代码

protected string Name(Item item)
{
    if (item != null)
    {
        return item.Name;
    }
    return string.Empty;
}

输出是：

IT TestUser1
Administration TestUser2
Administration TestUSer3
Administration TestUser4
Administration TestUser5
Finance TestUSer6

是否有可能以某种方式将列表 "empSubRelList" 与部门分组以便我可以获得以下输出：

IT TestUser1
Administration TestUser2 TestUser3 TestUser4 TestUser5
Finance TestUser6

Answer 1

应该这样做：

var list = new List<CustomItem>(){
    new CustomItem() { Department= "IT", UserName = "TestUser1"},
    new CustomItem() { Department = "Administration", UserName = "TestUser2"},
    new CustomItem() { Department = "Administration", UserName = "TestUser3"},
    new CustomItem() { Department = "Administration", UserName = "TestUser4"},
    new CustomItem() { Department = "Administration", UserName = "TestUser5"},
    new CustomItem() { Department = "Finance", UserName = "TestUser6"},
};

list.GroupBy (l => l.Department)
    .Select (l => new {
        Department = l.Key,
        Users = l.Select (x => x.UserName).Aggregate ((c,n) => c + ", " + n )
    });

输出：

关键是，您首先要按部门项目分组。之后你 select 用户名属性并聚合它们。 Aggregate() 所做的是，它获取当前 (c) 和下一个 (n) 项目，然后执行您对它们指定的操作。在这种情况下，它用逗号和空格将它们连接起来 ((c,n) => c + ", " + n)。然后它会移动到下一个项目

Demo Code

Answer 2

正如Serv所写，您可以在设置转发器的数据源之前进行分组：

IEnumerable<KeyValuePair<string, string>> dataSource = empSubRelList
    .GroupBy(listItem => Name(listItem.DepartmentItem))
    .Select(grouping => new KeyValuePair<string, string>(
        groupping.Key,
        string.Join(", ", grouping.Select(emp => Name(emp.EmployeeItem)))
    ));

repEmployees.DataSource = dataSource;

然后在您的 html 代码中：

<asp:Repeater runat="server" ID="repEmployees">
   <ItemTemplate>
       <li>
            <%# ((KeyValuePair<string, string>)Container.DataItem).Key %>
            <%# ((KeyValuePair<string, string>)Container.DataItem).Value %>
       </li>
   </ItemTemplate>
</asp:Repeater>

按对象列表中的项目分组（Sitecore 项目）并与 Repeater 绑定

Group by Items in list of objects (Sitecore Item) and bind with Repeater

c#

asp.net

sitecore

sitecore7