Why my asyncResult is always null?

Question

I have the following program that uses async operation but the returning IAsyncResult.AsyncState is always null.

What I'm doing wrong?

public interface ICommandService
{
[OperationContract(AsyncPattern = true)]
IAsyncResult BeginLogin(string userName, string password, AsyncCallback callback, object state);

string EndLogin(IAsyncResult result);
}

class CommandService : ICommandService
{
    public string Login(string userName, string password)
    {            
        return "dorcohen";
    }

    private Func<string, string, string> _LoginDelgateObject;

    public IAsyncResult BeginLogin(string userName, string password, AsyncCallback callback, object state)
    {
        Func<string, string, string> function = new Func<string, string, string>(Login);
        _LoginDelgateObject = function;
        IAsyncResult result = function.BeginInvoke(userName, password, callback, state);
        return result;
    }

    public string EndLogin(IAsyncResult result)
    {
        CommandService test = result.AsyncState as CommandService;
        return test._LoginDelgateObject.EndInvoke(result);
    }
}

It seems it depends on the way you are calling BeginLogin(), as the _state_ is passed along with the other parameters. Would you please show us the calling code? — Efran Cobisi, Sep 12 '12 at 07:51

score 1 · Accepted Answer · answered Sep 12 '12 at 07:33

1

cant you use the following code in the BeginLogin method

function.BeginInvoke(userName, password, callback, this);

answered Sep 12 '12 at 07:33

Parv Sharma

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Why my asyncResult is always null?

1 Answers1