fixed #259

src/Shared/HandyControl_Shared/Data/ColorRange.cs

@@ -67,7 +67,7 @@ namespace HandyControl.Data
         /// <returns></returns>
         public Color GetColor(double range)
         {
-            if (range < 0 || range > 1) return default(Color);
+            if (range < 0 || range > 1) return default;
             return Color.FromArgb((byte)(_color1.A - _subColorArr[0] * range), (byte)(_color1.R - _subColorArr[1] * range),
                 (byte)(_color1.G - _subColorArr[2] * range), (byte)(_color1.B - _subColorArr[3] * range));
         }

src/Shared/HandyControl_Shared/Data/ResourceToken.cs

@@ -192,6 +192,8 @@
 
         public const string Double2GridLengthConverter = nameof(Double2GridLengthConverter);
 
+        public const string DoubleMinConverter = nameof(DoubleMinConverter);
+
         #endregion
 
         #region Effect