Interlocked.Exc hange(Object, Object), Option Strict On, and Thread Safety

Unless I am mistaken, this is because your struct is by nature a value type, where as an object is a reference type. Try chaning your struct to a class and see if this helps

Da

----- Eduardo Garcia-Prieto wrote: ----

I have come accross a problem in using th
Interlocked.Exc hange(Object, Object) method while using Option Stric
On in my project. I have a private class structure variable which ca
be updated by a separate thread. In order to guarantee that th
variable can be updated in an atomic operation it occurred to me tha
I could use Interlocked.Exc hange

Class MyClas

Private Structure MyStructur
Dim Value As Strin
End Structur

Private _myStruct As MyStructur

Public ReadOnly Property Value As Strin
Ge
Return _myStruct.Valu
End Ge
End Propert

'Method that can be called by another threa
Public Sub UpdateMyStruct(
Dim NewStruct As MyStructur
NewStruct.Value = "B
Interlocked.Exc hange(_myStruct , NewStruct
End Su

End MyClas
The problem is that when Option Strict is On, the compiler issues
build error on the line with the call t
Interlocked.Exc hange(_myStruct , NewStruct)
...
Overload resolution failed because no accessible 'Exchange' can b
called with these arguments
'Public Shared Function Exchange(ByRef location1 As Object, valu
As Object) As Object'
Option Strict On disallows implicit conversions from 'System.Object
to 'MyNamespace.My Class.MyStructu re'
...

To work around it I have implemented a ReaderWriterLoc k in the clas
to synchronise access to the private structure variable

Has anyone dealt with this situation in a better way? I don't want t
turn Option Strict off