如何在實體列表中寫入LINQ到實體Lambda和連接屬性

Question

我寫了下面的方法來填充一個DropDownList，它的工作原理。不過，我想用Lambda表達式作爲SelectList初始化器的第一個參數而不是理解查詢來編寫適當的LINQ查詢。我的目標是連接Eventm對象的EventmId和EventmTitle屬性，使其在DropDownList中顯示爲選擇。

謝謝！

 private void PopulateEventmsDropDownList(object selectedEventm = null) 
      { 
       var eventmsQuery = unitOfWork.EventmRepository.Get(
             orderBy: q => q.OrderBy(d => d.EventmId)); 

       ViewBag.EventmID = new SelectList(
       (from s in eventmsQuery select new { EventmId = s.EventmId.ToString(), 
       FullID = s.EventmId + " " + s.EvtTitle }), 
       "EventmId", "FullID", selectedEventm); 
      } 

Answer 1

我想出了這個Lambda表達式一些試驗和錯誤使用LINQPad後在選擇列表的（更換理解查詢）如下：

private void PopulateEventmsDropDownList(object selectedEventm = null) 
    { 
     var eventmsQuery = unitOfWork.EventmRepository.Get(
      orderBy: q => q.OrderBy(d => d.EventmId)); 

     ViewBag.EventmID = new SelectList(nodesQuery.Select(
      x => new {x.NodeId, FullID = string.Join(
      " ", x.NodeId.ToString(), x.Title) }), "EventmId", "FullID", selectedEventm); 
    }