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CodeAdze
#1 Posted : Saturday, March 12, 2016 11:51:22 AM(UTC)
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Hi,
I have the following test fixture.
Code:

Imports System.Windows.Controls
Imports NUnit.Framework


<TestFixture>
Public Class SearchResultPaserTests
  <Test>
  <STAThread>
  Public Sub ParseMethodReturnsComboBoxItem()
    Dim srp As New SearchResultPaser

    Assert.AreEqual(GetType(ComboBoxItem), srp.Parse(New SearchResult()).GetType())
  End Sub
End Class


Which tests the following class which is in a class library referenced by a WPF application.

Code:

Imports System.Windows.Controls

Public Class SearchResultPaser
  <STAThread>
  Public Function Parse(result As SearchResult) As ComboBoxItem

   [h] Return New ComboBoxItem()[/h]
  End Function
End Class


I am getting a "Invalid Operation Exception : The calling thread must be STA, because many UI components require this." when I try to return a new ComboBoxItem . After reading this post I tried adding the <STAThread> attributes but still no joy.
The SearchResultPaser class works fine when called form my WPF app presumably because it is then running on WPF's UI thread.

What can I do to resolve this.

Thanks
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Ralf Koban
#2 Posted : Saturday, March 12, 2016 4:37:37 PM(UTC)
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Joined: 5/19/2014(UTC)
Posts: 44
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Hi,

seems you are using NUnit 3 where STAThread is no longer supported.

Please use the Apartment state instead:

<TestFixture>
Public Class SearchResultPaserTests
<Test>
<Apartment(ApartmentState.STA)>
Public Sub ParseMethodReturnsComboBoxItem()
Dim srp As New SearchResultPaser

Assert.AreEqual(GetType(ComboBoxItem), srp.Parse(New SearchResult()).GetType())
End Sub
End Class


Regards
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2 users thanked Ralf Koban for this useful post.
Remco on 3/12/2016(UTC), CodeAdze on 3/13/2016(UTC)
CodeAdze
#3 Posted : Sunday, March 13, 2016 9:58:12 AM(UTC)
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Joined: 9/3/2014(UTC)
Posts: 29
Location: Australia

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Was thanked: 3 time(s) in 3 post(s)
Hi Ralf,
Thanks for your help with this, yes I was using NUnit 3 which I forgot to mention in my post and your suggestion to change <STAThread> to <Apartment(ApartmentState.STA)> worked perfectly.

Thanks again!
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