Question

I did the web method below using C#. I’m tryin to convert this into VB.NET, but I’m missing something. I’m using it with an ajax calling, from a paginator/sorter table plugin.

[WebMethod( EnableSession = true )]
public static object listaPessoas(int jtStartIndex = 0, 
                                  int jtPageSize = 0, 
                                  string jtSorting = null)
{
    return new { Result = "OK", 
                 Records = persons.ToList(), 
                 TotalRecordCount = persons.count };
}

First, error in VB – I can’t leave the parameters as optional(“Attribute WebMethod cannot be applied to a method with optional parameters“):

<WebMethod()> _
Public Function listaPessoas(Optional ByVal jtStartIndex As Integer = 0, 
                             Optional ByVal jtPageSize As Integer = 0, 
                             Optional ByVal jtSorting As String = Nothing)

Second, I don’t know how to return the message “OK” and the list of people.

Can anyone me help to convert this into VB.NET?

Answer 1

Seems like you can’t use optional parameters with WebMethods. You can use overloading. Example:

<WebMethod()> _
Public Function listaPessoas(jtStartIndex As Integer, jtPageSize As Integer)

<WebMethod()> _
Public Function listaPessoas(jtStartIndex As Integer, jtPageSize As Integer, jtSorting As String)

The C# object returned is an anonymous object. The VB syntax is:

Return New With { .Result = "OK", 
                  .Records = persons.ToList(), 
                  .TotalRecordCount = persons.count }