使用LINQ聚合对象

我有SQL查询获得块计数，按块名称分组

var sql = @"select count(*) [COUNT], o.NAME from WISH w
                            left join objects o on o.ID = w.[BLOCKID]
                            where w.ISDELETE = 0
                            group by o.NAME"
var cmd = new SqlCommand(sql, connection);
var reader = cmd.ExecuteReader();
Label labelClear = (Label)Master.FindControl("labelClear");
if (reader.HasRows)
{
   while (reader.Read())
   {
      labelClear.Text += reader["NAME"].ToString() + " - " + reader["COUNT"].ToString() + "; ";
   }
 }

使输出字符串像:

"BLOCKNAME1 - 15; BLOCKNAME2 - 3; BLOCKNAME3 - 28" etc.

(其中15,3和28 - BLOCKNAME1, BLOCKNAME2和BLOCKNAME3的计数)。

我尝试将这个查询转换为LINQ:

((Label)Master.FindControl("labelClear")).Text = 
Db.WISH.Where(x => x.ISDELETE == 0)
.GroupBy(x => x.OBJECTS_BLOCK.NAME)
.Select(g => new { Name = g.Key, Cnt =  SqlFunctions.StringConvert((decimal?)g.Count()) })
.Aggregate((a, b) => a.Name + ": " + a.Cnt + ", " + b.Name + ": " + b.Cnt );

但是在最后一行(与Aggregate)得到错误:

Cannot implicitly convert type 'string' to 'AnonymousType#2'

如何将结果聚合成像

这样的字符串?

"BLOCKNAME1 - 15; BLOCKNAME2 - 3; BLOCKNAME3 - 28"

((Label)Master.FindControl("labelClear")).Text = 
Db.WISH.Where(x => x.ISDELETE == 0)
.GroupBy(x => x.OBJECTS_BLOCK.NAME)
.Select(g => new { Name = g.Key, Cnt =  SqlFunctions.StringConvert((decimal?)g.Count()) })
.AsEnumerable()
.Aggregate(string.Empty, (a, b) => a + ", " + b.Name + ": " + b.Cnt, s => s.Substring(2));