完善契约与客户端、服务端的收发代码

SHH.CameraDashboard/Pages/CameraWall/VideoTileViewModel.cs

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+using SHH.Contracts;
+using System.IO;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+namespace SHH.CameraDashboard
+{
+    public class VideoTileViewModel : ViewModelBase, IDisposable
+    {
+        // --- 绑定属性 ---
+
+        private ImageSource _displayImage;
+        public ImageSource DisplayImage
+        {
+            get => _displayImage;
+            set => SetProperty(ref _displayImage, value);
+        }
+
+        private string _cameraName;
+        public string CameraName
+        {
+            get => _cameraName;
+            set => SetProperty(ref _cameraName, value);
+        }
+
+        private string _statusInfo;
+        public string StatusInfo
+        {
+            get => _statusInfo;
+            set => SetProperty(ref _statusInfo, value);
+        }
+
+        private bool _isConnected;
+        public bool IsConnected
+        {
+            get => _isConnected;
+            set => SetProperty(ref _isConnected, value);
+        }
+
+        // --- 构造函数 ---
+        public VideoTileViewModel(string ip, int port, string name)
+        {
+            CameraName = name;
+            StatusInfo = "连接中...";
+
+            IsConnected = true;
+        }
+
+        private void HandleNewFrame(VideoPayload payload)
+        {
+            // 必须回到 UI 线程更新 ImageSource
+            Application.Current.Dispatcher.Invoke(() =>
+            {
+                // 1. 更新图片
+                byte[] data = payload.TargetImageBytes ?? payload.OriginalImageBytes;
+                if (data != null && data.Length > 0)
+                {
+                    DisplayImage = ByteToBitmap(data);
+                }
+
+                // 2. 更新状态文字
+                StatusInfo = $"{payload.CaptureTime:HH:mm:ss} | {data?.Length / 1024} KB";
+            });
+        }
+
+        // 简单的 Bytes 转 BitmapImage (生产环境建议优化为 WriteableBitmap)
+        private BitmapImage ByteToBitmap(byte[] bytes)
+        {
+            var bitmap = new BitmapImage();
+            using (var stream = new MemoryStream(bytes))
+            {
+                bitmap.BeginInit();
+                bitmap.CacheOption = BitmapCacheOption.OnLoad;
+                bitmap.StreamSource = stream;
+                bitmap.EndInit();
+            }
+            bitmap.Freeze(); // 必须冻结才能跨线程
+            return bitmap;
+        }
+
+        public void Dispose()
+        {
+            IsConnected = false;
+        }
+    }
+}