C#C
C#•3y ago•
7 replies
Keyinator

❔ Using JsonConvert to send over interface

Hello everyone,

after long times of googling I sadly haven't found any solution to a jsonconvert problem with interfaces.
I have three projects: 
Client
, 
Server
, 
Shared
. Both 
Client
 and 
Server
 can access 
Shared
.
In the shared project I have the following classes: 
S_Mode1:S_IMode
, 
S_Mode2:S_IMode
 which inherit from the interface 
S_IMode

Now my goal is to serialize these classes using 
JsonConvert
 and send them from the server to the client.
My idea is to send them as an 
S_IMode
 so that on the client I can use them as expected and still differentiate between 
S_Mode1
 and 
S_Mode1


I am currently serializing this into a string from the server using
string jsonNewMode = JsonConvert.SerializeObject(mode.AsSharedMode, new JsonSerializerSettings() { TypeNameHandling = TypeNameHandling.Auto });
//mode.AsSharedMode returns either S_Mode1 or S_Mode2 casted into an S_IMode

and then trying to deserialize
S_IMode s1 = JsonConvert.DeserializeObject<S_IMode>(value, new JsonSerializerSettings() { TypeNameHandling = TypeNameHandling.Auto });


Sadly this fails with
Newtonsoft.Json.JsonSerializationException: Could not create an instance of type GCShared.NewModus.Networking.S_IMode. Type is an interface or abstract class and cannot be instantiated. Path 'Id', line 1, position 6.


Any tips what I can do?
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