Establish the use of generic incoming and return the generic list (List (Of T))

Establish the use of generic incoming and return the generic list (List (Of T))

Dotblogs label: VB.Net, with the Notes

Member practice today please turn into the DataTable List, but do attribute of the <-> corresponding field, the result of member So now, told me that having problems, he did not know how to build a list of generics, I clearly remember the results should be CreateInstance method, but how can not remember how to do it> <. Finally found out a long time ago to write the Sample Code, you'd better write it down, otherwise the next time they're looking for a long time ......

Module Module1

    Sub Main()
        Dim PersonList = ToGenericList(New Person())
        PersonList.Item(0).Name = "XYZ"
        PersonList.Item(1).Name = "Leo"
        For Each p In PersonList
            Console.WriteLine(p.Name)
        Next

        Console.ReadLine()
    End Sub

    Public Function ToGenericList(Of T)(ByVal entity As T) As List(Of T)
        Dim GenericList As New List(Of T)
        Dim p1 As T = CType(Activator.CreateInstance(GetType(T)), T)
        GenericList.Add(p1)
        Dim p2 As T = CType(Activator.CreateInstance(GetType(T)), T)
        GenericList.Add(p2)

        Return GenericList
    End Function

End Module

Public Class Person
    Public Name As String
    Public Age As Integer
End Class

Program focus is: with Activator.CreateInstance to Come!

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91 great reminder of better wording, conditional constraint with generic way, do not have a particular target when a parameter and then New, big thank ~~ procedure is amended as follows:

Module Module1

    Sub Main()
        Dim PersonList = ToGenericList(Of Person)()
        PersonList(0).Name = "XYZ"
        PersonList(1).Name = "Leo"
        For Each p In PersonList
            Console.WriteLine(p.Name)
        Next

        Console.ReadLine()
    End Sub

    Public Function ToGenericList(Of T As New)() As IEnumerable(Of T)
        Dim GenericList As New List(Of T)
        GenericList.Add(New T)
        GenericList.Add(New T)

        Return GenericList
    End Function

End Module

Public Class Person
    Public Name As String
    Public Age As Integer
End Class

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nothing special -
but only some notes

Original: Large column  using the incoming generic build and return a generic list (List (Of T))