CODEWITHSUNDEEP
vb.netforeachienumerable
frankie
frankie

Reputation: 728

How can I go with For Each over class properties in VB.NET?

I see such C# code which allow me go with foreach cycle over class properties. 

public class EstimateDetailsModel : IEnumerable<string>
{
    public string Dma { get; set; }

    public string Callsign { get; set; }

    public string Description { get; set; }

    public IEnumerator<string> GetEnumerator()
    {
        yield return Dma;
        yield return Callsign;
        yield return Description;
    }

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
    {
        return this.GetEnumerator();
    }
}

Help please. How can I make something like this using vb.net?

Upvotes: 1

Views: 509

Answers (1)

JaredPar
JaredPar

Reputation: 755121

What you have provided here is a C# iterator method (the methods containing yield return). Unfortunately there is no analogous feature for VB.Net at this time. The easiest way to simulate this is to instead build up a List(Of String) and return thate

Public Function GetEnumerator() As IEnumerable(Of String) _ 
    Implements IEnumerable(Of String).GetEnumerator
  Dim list As New List(Of String)()
  list.Add(Dma)
  list.Add(Callsign)
  list.Add(Description)
  return list
End Function 

Public Function GetEnumerator2() As IEnumerable _ 
    Implements IEnumerable.GetEnumerator
  Return GetEnumerator()
End Function

This isn't exactly equivalent to the C# version. Mainly because it will be promptly executed instead of delayed executed. But the end effect will be roughly the same

EDIT

Ah I forgot that Vb.Net added iterator support in the latest version (Visual Studio 2012). If you are using that version of Visual Studio you can do the following 

Public Iterator Function GetEnumerator() As IEnumerable(Of String) _ 
    Implements IEnumerable(Of String).GetEnumerator
   Yield Dma
   Yield Callsign
   Yield Description 
End Function

Upvotes: 1

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