更新

AntdWpf/Converters/LocalEx.cs

@@ -0,0 +1,19 @@
+using System.Collections.Generic;
+using System.Linq;
+
+//https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/blob/master/src/MaterialDesignThemes.Wpf/Converters/CircularProgressBar/LocalEx.cs
+
+namespace AntdWpf.Converters
+{
+    internal static class LocalEx
+    {
+        public static double ExtractDouble(this object value)
+        {
+            double d = value as double? ?? double.NaN;
+            return double.IsInfinity(d) ? double.NaN : d;
+        }
+
+
+        public static bool AnyNan(this IEnumerable<double> values) => values.Any(double.IsNaN);
+    }
+}