asp.net core 3.1 SignalR: pass complex object from javascript client to Hub

Question

I'm trying to pass an object from client to hub: On client:

connection.invoke('MyMethod', {
                i: 1,
                a: 25
            });

On hub:

        public async Task MyMethod(TestModel model)
        {
            // logic
        }

Model:

public class TestModel
{
    [JsonProperty("i")]
    public double Min {get;set;}
    [JsonProperty("a")]
    public double Max {get;set;}
}

In the MyMethod the model is not null, but the values are always 0.

What I'm doing wrong?

The JsonProperty attribute is used when you're serializing the TestModel not binding it with json according to Newtonsoft docs. Did you try naming the TestModel fields i and a as a test? — HMZ
– HMZ, Commented Sep 17, 2020 at 12:14
@HMZ you're right, renamed them and it works. How do I use simplified names then? I want to reduce the data amount per request — Nikita Fedorov
– Nikita Fedorov, Commented Sep 17, 2020 at 12:36

Brando Zhang · Accepted Answer · 2020-09-17 14:26:24Z

7

According to your description, you should use Newtonsoft.Json in an ASP.NET Core 3.0 SignalR project, since the asp.net core doesn't use Newtonsoft.Json by default.

You should install the Microsoft.AspNetCore.SignalR.Protocols.NewtonsoftJson NuGet package and then modify the startp.cs ConfigureServices method as below:

services.AddSignalR()
    .AddNewtonsoftJsonProtocol();

More details, you could refer to this article.

edited Sep 17, 2020 at 14:26

answered Sep 17, 2020 at 12:36

Brando Zhang

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2 Comments

Alexander Selishchev Over a year ago

what to do with client side signalR.HubConnectionBuilder?

Max Over a year ago

Use this option .withHubProtocol(new signalR.JsonHubProtocol()). Works with newtonsoft json protocol as well. Not sure why this isn´t in their documentation at all as far as I can tell.

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