Backendless 4.0 .NET SDK

General
1

the login works flawlessly, but now im facing this when trying to retreive data using the following code


           Backendless.Persistence.Of<Restaurants>()
                    .Find(dataQueryBuilder, new AsyncCallback<IList<Restaurants>>(response =>
                        {
                            Console.WriteLine("Found IT");
                        },
                        fault =>
                        {
                            Console.WriteLine(fault.Message);
                        }));            
        }

     but in my output i only get

Cannot create an instance of an interface.

any help would be appreciated

2

Hi Ibrahim,

Try changing IList in the AsyncCallback generic to a concrete collection class, say ArrayList:

 Backendless.Persistence.Of<Restaurants>()
 .Find(dataQueryBuilder, new AsyncCallback<ArrayList<Restaurants>>(response =>
 {
 Console.WriteLine("Found IT");
 },
 fault =>
 {
 Console.WriteLine(fault.Message);
 })); 
 }

Regards,
Mark

3

How do i change it the AsyncCallback genric to a concrete collection , i tried the code you posted it just gave “Cannot convert error” , i know i should wait for the Docs to be uploaded ,

4

Hi Ibrahim,

I was able to reproduce the problem. There is an updated assembly at:
https://github.com/Backendless/.NET-SDK/blob/4.0/Backendless/Bin/NET_40/Debug/Backendless.dll

Please download and give it a try.

Regards,
Mark

5

Hello Mark

thank you for replaying to me and helping me , and it works like a charm now i’ll keep trying other stuff and report back if i found anything else,
honestly Extraordinary work from Backendless

thanks again
Ibrahim