C# SignalR Protobuf Protocol

To use

Call SignalRBuilderExtensions.AddProtobufProtocol with the Types of the Protobuf messages that you wish to serialize. The types need to be specified up-front in order to know which type to use when deserializing. The server and client must supply the same types with the same indexes for deserializing to work properly.

Client example

var client = new HubConnectionBuilder()
    ...
    .AddProtobufProtocol(
        new Dictionary<int, Type>
        {
            [0] = typeof(FirstProtoMessage),
            [1] = typeof(SecondProtoMessage)
        }
    )
    .Build();

Server example

services
    .AddSignalR() // or AddAzureSignalR()
    .AddProtobufProtocol(
        new Dictionary<int, Type>
        {
            [0] = typeof(FirstProtoMessage),
            [1] = typeof(SecondProtoMessage)
        }
    );

Supported

• Calls that have any number of Protobuf arguments
• List<IMessage> handling. Note that there is overhead for each item in the list though (up to 8 bytes), so if polymorphism isn't needed, use a Protobuf model with repeated instead.

Not supported

• Methods that take in or return primitives