转换列表LINQ表达式定义列表类(Convert a list linq expression to

y具有该类

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

现在，我想从拉姆达或LINQ表达填补MyClass的名单，一些像这样....

    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()

但我得到这个错误“表达式不会产生一个值”，我该怎么做呢？

Answer 1:

myClassList.Add是在查询错误部分，编辑如下：

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:

你会做到以下几点：

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()

你几乎拥有了正确的代码。 你只需要删除调用myClassList.Add()

文章来源: Convert a list linq expression to Defined list Class