更新框架

Source/Store.Management.Framework/Converters/StringNullOrEmpty2VisibilityConverter.cs

@@ -0,0 +1,15 @@
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace Store.Management.Framework.Converters;
+
+/// <summary>空字符串或 null 显示占位内容，其他值折叠；仅用于单向绑定。</summary>
+public sealed class StringNullOrEmpty2VisibilityConverter : IValueConverter
+{
+	public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+		=> value is null || value is string { Length: 0 } ? Visibility.Visible : Visibility.Collapsed;
+
+	public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+		=> Binding.DoNothing;
+}