Question

I have this function in vb.net that I converted from C# for a project I’m working on.

Private Function GetAllFactory(Of T)(ByVal ctor As Construct(Of T)) As List(Of T)

    'TODO: Data Access stuff 
    Dim ds As New DataSet()
    Dim entities = New List(Of T)()

    For Each dataRow As DataRow In ds.Tables(0).Rows
        Dim entity As T = ctor(dataRow)
        entities.Add(entity)
    Next
    Return entities

End Function

and the following delegate

Private Delegate Function Construct(Of T)(ByVal dataRow As DataRow) As T

I tried converting the code to call the function from C# to vb.net

Return GetAllFactory(Of MyType)(row >= New MyType(row))

the above line doesn’t work. I’m sort of stuck. I haven’t used lambda much in C# and even less in vb.net.

MyType constructor:

Public Sub New(ByVal dataRow As DataRow)
  .
  .
  .
 End Sub

Any suggestions on how to call the GetAllFactory?

Answer 1

You use the Function keyword in VB to write a lambda expression:

Return GetAllFactory(Of MyType)(Function(row) New MyType(row))

Note that >= is a comparison operator while => is the lamda operator in C#. VB might give you some unexpected error message for code using => as it accepts that as an undocumented alias for the >= operator.