将列表linq表达式转换为Defined list Class [英] Convert a list linq expression to Defined list Class

问题描述

你有这堂课

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lambda或linq表达式中填充MyClass的列表，像这样....

Now i want fill a list of MyClass from lambda or linq expression, some like this....

    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()

但是我得到这个错误表达式不产生值"，我该怎么做?

but i get this error "Expression does not produce a value", how i make this ?

推荐答案

myClassList.Add是您的查询中的错误部分，请按如下所示进行

myClassList.Add is wrong part in your query, edit it as follow:

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()

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