更新

ShrlAlgoToolkit.Mvvm/Converters/NullToBooleanConverter.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Windows.Data;
+
+namespace ShrlAlgoToolkit.Mvvm.Converters
+{
+    public class NullToBooleanConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value != null;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}