Question

我有一个循环：

<% foreach (User usedBy in discountDto.UsedBy)
   { %>
     <%=usedBy.FullName%><br />
<% } %>

通常会生成多个具有相同名称的行：

Bob Smith
Mark Thomas
Mark Thomas
Steve Jones

我想将多行聚合到一行，后跟一个表示该名称出现次数的整数：

Bob Smith
Mark Thomas (2)
Steve Jones

Answer 1

请原谅格式化 - 错误的工具“交出”......

foreach (User usedBy in discountDto.UsedBy.GroupBy(x => x.FullName))
{
    var count = usedBy.Count();
  %><%=usedBy.Key%><%
       if(count>1) %><%=" (" + count + ")"%><%
     %><br />
<% } %>

Answer 2

var aggregatedUsers=from users in discountDto.UsedBy
                                    group user by user.FullName into result
                                    select new 
                                        {
                                            User=result.Key,
                                            Count= result.Count(),
                                        };

Answer 3

这样的事对我有用

foreach (var item in list.GroupBy(u => new {u.Surname, u.FirstName}))
{
    %>
    <%=Html.Encode(item.Key.FirstName)%>
    <%=Html.Encode(item.Key.Surname)%>
    <%
    if (item.Count) > 1)
    {
        %>
        (<%=item.Count%>)
        <%
    }
}

Answer 4

试试这个：请原谅我的语法不好......我的Asp.Net生锈了，希望你明白这个想法......

  <% 
   Dictionary<string,int> counts = new Dictionary<string, int>();
   foreach (User usedBy in discountDto.UsedBy)   
   { %>
        <%if (counts.Contains(usedBy.FullName)) counts[usedBy.FullName]++; 
          else counts.Add(usedBy.FullName, 1);       
   } %>
   <% foreach(string usdBy in counts)
   { %> 
      <%=usdBy%><br /><% 
      <%if (counts[usdBy] > 1) 
        {%>
           (<%=counts[usdBy];%>) <%
        }%>
   } %>

在foreach循环中聚合

4 个答案: