doc(ITcpSocketClient): add Receive documentation

src/BootstrapBlazor/Services/TcpSocket/DefaultTcpSocketClient.cs

@@ -33,6 +33,7 @@ public override async ValueTask<bool> ConnectAsync(IPEndPoint endPoint, Cancella
 
             // 创建新的 TcpClient 实例
             _client ??= new TcpClient(localEndPoint);
+            _remoteEndPoint = endPoint;
 
             var connectionToken = token;
             if (ConnectTimeout > 0)
@@ -43,15 +44,19 @@ public override async ValueTask<bool> ConnectAsync(IPEndPoint endPoint, Cancella
             }
             await _client.ConnectAsync(endPoint, connectionToken);
 
-            // 设置本地以及远端端点信息
-            LocalEndPoint = (IPEndPoint)_client.Client.LocalEndPoint!;
-            _remoteEndPoint = endPoint;
-
-            if (IsAutoReceive)
+            if (_client.Connected)
             {
-                _ = Task.Run(AutoReceiveAsync);
+                // 设置本地端点信息
+                if (_client.Client.LocalEndPoint is IPEndPoint local)
+                {
+                    LocalEndPoint = local;
+                }
+                if (IsAutoReceive)
+                {
+                    _ = Task.Run(AutoReceiveAsync);
+                }
             }
-            ret = true;
+            ret = _client.Connected;
         }
         catch (OperationCanceledException ex)
         {
@@ -119,7 +124,7 @@ public override async ValueTask<bool> SendAsync(ReadOnlyMemory<byte> data, Cance
 
     public override async ValueTask<Memory<byte>> ReceiveAsync(CancellationToken token = default)
     {
-        if (_client == null || !_client.Connected)
+        if (_client is not { Connected: true })
         {
             throw new InvalidOperationException($"TCP Socket is not connected {LocalEndPoint}");
         }
@@ -188,6 +193,7 @@ private async ValueTask<int> ReceiveCoreAsync(TcpClient client, Memory<byte> buf
                 {
                     await DataPackageHandler.ReceiveAsync(buffer, receiveToken);
                 }
+                len = buffer.Length;
             }
         }
         catch (OperationCanceledException ex)