更新

AntdWpf/Converters/ToLowerConverter.cs

@@ -0,0 +1,19 @@
+namespace AntdWpf.Converters;
+
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+[ValueConversion(typeof(string), typeof(string))]
+public class ToLowerConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        return (value as string)?.ToLower();
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        return DependencyProperty.UnsetValue;
+    }
+}