CODEWITHSUNDEEP
c#multithreadingcompact-frameworkpropertiesinvoke
Franziee
Franziee

Reputation: 649

Threading in property setter

I have two properties. The first one is an integer property, this is an ID. The second one is a String, it's corresponding to the ID. When I set the ID, I will set the correspondent string property in a separate thread. The code snipet is:

public int FirstPlaceId 
{
    set 
    {
        firstPlaceId = value;
        setPlaceNameDelegate d = new setPlaceNameDelegate( setPlaceName );
        IAsyncResult iar = d.BeginInvoke( value, null, null );
        FirstPlace = d.EndInvoke( iar );
    }
    get { return firstPlaceId; } 
}

public string FirstPlace { set; get; }

private string setPlaceName(int id) 
{
    return "alma"; 
}

delegate String setPlaceNameDelegate( int id );

methodus() 
{
   FirstPlaceId = 5; 
}

I think it looks like ok. But in runtime when I assign some value (5) to the FirstPlaceId property, the NotSupportedException error occurs. Why and what is the solution? Thx

Upvotes: 0

Views: 356

Answers (2)

ytg
ytg

Reputation: 1857

public void SetFirstPlaceId(int value)
{
    firstPlaceId = value;
    Thread t = new Thread(delegate()
    {
        FirstPlace = setPlaceName(1);
    });
    t.IsBackground = true;
    t.Start();
}

EDIT: code fixed to actually start the Thread.

With this modification it just works fine for me. (And I'm not a C# expert so I don't know for sure, but I guess that your delegate doesn't support BeginInvoke and EndInvoke for some reason.)

Upvotes: 0

Ilian
Ilian

Reputation: 5355

I can't reproduce your issue. Which .NET Framework are you using?

With that said, I don't see the benefit of using BeginInvoke/threading in your sample code since it will immediately wait for the delegate call to complete (with EndInvoke). That property will just block and is functionally the same this one:

public int FirstPlaceId
{
    set 
    {
        firstPlaceId = value;
        FirstPlace = setPlaceName(value);
    }
    get { return firstPlaceId; }
}

Just remove BeginInvoke.

Upvotes: 1

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