轉換列表LINQ表達式定義列表類

Question

y具有該類

Private Class MyClass 
    Public Property propertyOne() as String 
    Public Property propertyTwo() as String 
    Public Property propertyN() as Integer 
End Class 

現在我想從拉姆達或LINQ表達填補MyClass的名單，一些像這樣....

Dim myClassList as new List(Of MyClass) 
    myClassList = (From lOtherList1 in MyOtherList1.GetAll() 
        join lOtherList2 in MyOterhList2.GetAll() on lOtherList1.Id Equals lOtherList2.Id 
        Select myClassList.Add(new MyClass With { .propertyOne = lOtherList1.Field1, 
        .propertyTwo = lOtherList1.Field2, 
        .propertyN = lOtherList2.Field1 })).Tolist() 

但我得到這個錯誤「表達式不會產生一個值」，我如何做到這一點？

Answer 1

myClassList.Add是在查詢中錯誤部分，編輯如下：

Dim myClassList as new List(Of MyClass) 
myClassList = (From lOtherList1 in MyOtherList1.GetAll() 
       join lOtherList2 in MyOterhList2.GetAll() 
       on lOtherList1.Id Equals lOtherList2.Id 
       Select new MyClass With 
       { 
       .propertyOne = lOtherList1.Field1, 
       .propertyTwo = lOtherList1.Field2, 
       .propertyN = lOtherList2.Field1 
       })).Tolist() 

Answer 2

你會做到以下幾點：

myClassList = (From lOtherList1 in MyOtherList1.GetAll() 
       Join lOtherList2 in MyOtherList2.GetAll() 
       On lOtherList1.Id Equals lOtherList2.Id 
       Select new MyClass With 
       { 
        .propertyOne = lOtherList1.Field1, 
        .propertyTwo = lOtherList1.Field2, 
        .propertyN = lOtherList2.Field1 
       }).ToList() 

你幾乎擁有了正確的代碼。你只需要刪除呼叫myClassList.Add()。