Добавил класс для представления сообщения

AMessanger/Services/ChatService.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Threading;
 using System.Threading.Tasks;
+using AMessanger.Models;
 using Microsoft.AspNetCore.SignalR.Client;
 
 namespace AMessanger.Services;
@@ -9,7 +10,7 @@ public class ChatService
 {
     private readonly HubConnection _connection;
 
-    public event Action<string, string>? OnMessageRecieved;
+    public event Action<Message>? OnMessageRecieved;
     
     public bool IsConnected { get; private set; } = false;
 
@@ -20,8 +21,8 @@ public class ChatService
             .WithAutomaticReconnect()
             .Build();
 
-        _connection.On<string, string>("ReceiveMessage", (user, message) =>
-            OnMessageRecieved?.Invoke(user, message));
+        _connection.On<Message>("ReceiveMessage", m =>
+            OnMessageRecieved?.Invoke(m));
     }
 
     public Task ConnectAsync(CancellationToken cancellationToken = default)
@@ -42,8 +43,8 @@ public class ChatService
         return _connection.StopAsync(cancellationToken);
     }
 
-    public Task SendMessageAsync(string user, string message, CancellationToken cancellationToken = default)
+    public Task SendMessageAsync(Message message, CancellationToken cancellationToken = default)
     {
-        return _connection.InvokeAsync("SendMessage", user, message, cancellationToken);
+        return _connection.InvokeAsync("SendMessage", message, cancellationToken);
     }
 }