具备界面基础功能

SHH.CameraDashboard/Converters/InverseNullToVisibilityConverter.cs

@@ -0,0 +1,19 @@
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace SHH.CameraDashboard;
+
+// 2. 对象为空时显示，不为空时隐藏 (用于显示提示文字)
+public class InverseNullToVisibilityConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        return value == null ? Visibility.Visible : Visibility.Collapsed;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}