Create project files

yawaflua.WebSockets/Core/WebSocketManager.cs

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+using System.Linq.Expressions;
+using System.Net.WebSockets;
+using System.Text;
+using yawaflua.WebSockets.Models.Interfaces;
+
+namespace yawaflua.WebSockets.Core;
+
+internal class WebSocketManager : IWebSocketManager
+{
+    public async Task Broadcast(Func<IWebSocketClient, bool> selector, string message,
+        WebSocketMessageType messageType = WebSocketMessageType.Text, CancellationToken cts = default)
+    {
+        foreach (var client in WebSocketRouter.Clients.Where(selector))
+        {
+            await client.webSocket.SendAsync(Encoding.UTF8.GetBytes(message),
+                messageType,
+                true,
+                cts);
+        }
+    }
+
+    public List<IWebSocketClient> GetAllClients()
+    {
+        return WebSocketRouter.Clients;
+    }
+
+    public async Task SendToUser(Guid id, string message, WebSocketMessageType messageType = WebSocketMessageType.Text, CancellationToken cts = default)
+    {
+        await WebSocketRouter.Clients.First(k => k.Id == id).webSocket.SendAsync(Encoding.UTF8.GetBytes(message),
+            messageType,
+            true,
+            cts);
+    }
+}