如何合併兩個Object成一個在C＃

Question

var taskMessages = from d in result 
        join ptask in db.ListingTask.Entites on new 
        { 
         d.Id, 
         TaskType = ListingTaskType.Offer.ToString() 
        } equals new 
        { 
         Id = ptask.DraftId, 
         ptask.TaskType 
        } into temp 
        from t in temp.DefaultIfEmpty() 
        select new 
        { 
         DraftId = d.Id, 
         OfferMessage = t == null || string.IsNullOrEmpty(t.Message) ? "無" : t.Message, 
         OfferSubmitResult = t == null || string.IsNullOrEmpty(t.Result) ? "無" : t.Result, 
         d.UserName, 
         d.UpdateTime, 
         d.Stock 
        }; 

在此LINQ查詢，當我需要的結果是所有的屬性，我需要每個屬性寫select new {}，有沒有簡單的方法來做到這一點？

Answer 1

將兩個物體插入結果對象：

var taskMessages = from d in result 
        join ptask in db.ListingTask.Entites on new 
        { 
         d.Id, 
         TaskType = ListingTaskType.Offer.ToString() 
        } equals new 
        { 
         Id = ptask.DraftId, 
         ptask.TaskType 
        } into temp 
        from t in temp.DefaultIfEmpty() 
        select new 
        { 
         // you would obviously need better names 
         object1 = t, 
         object2 = d 
        }; 

然後訪問屬性，像這樣：

taskMessages[0].object2.UpdateTime; //Just as an example 

更新（OP想在結果中直接使用的所有屬性）：

您可以通過C＃交互式窗口中的反射來獲取所有屬性的列表，並構建一個字符串輸出以粘貼到代碼中，如下所示：

#r "C:/MyApp/bin/Debug/Foo.dll" 
using MyApp; 
var myType = typeof(Person); 
var myProperties = myType.GetProperties(); 
foreach(var myProperty in myProperties) { Console.WriteLine($"{myProperty.Name} = myObject.{myProperty.Name},"); } 

Foo.dll是你的組件，它也可能是一個exe