添加项目文件。

UIShare/Converters/StringToVisibilityConverter.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Data;
+
+namespace UIShare.Converters
+{
+    public class StringToVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if(value is string str)
+            {
+                if (string.IsNullOrEmpty(str))
+                {
+                    return Visibility.Collapsed;
+                }
+                else
+                {
+                    return Visibility.Visible;
+                }
+            }
+            return Visibility.Collapsed;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}