support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/DoubleUtilities.cs

@@ -0,0 +1,66 @@
+namespace Standard
+{
+    using System;
+    using System.Diagnostics.CodeAnalysis;
+
+    internal static class DoubleUtilities
+    {
+        private const double Epsilon = 1.53E-06;
+
+        [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        public static bool AreClose(double value1, double value2)
+        {
+            if (value1 == value2)
+            {
+                return true;
+            }
+            double num = value1 - value2;
+            return ((num < 1.53E-06) && (num > -1.53E-06));
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        public static bool GreaterThan(double value1, double value2)
+        {
+            return ((value1 > value2) && !AreClose(value1, value2));
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        public static bool GreaterThanOrClose(double value1, double value2)
+        {
+            if (value1 <= value2)
+            {
+                return AreClose(value1, value2);
+            }
+            return true;
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        public static bool IsFinite(double value)
+        {
+            return (!double.IsNaN(value) && !double.IsInfinity(value));
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        public static bool IsValidSize(double value)
+        {
+            return (IsFinite(value) && GreaterThanOrClose(value, 0.0));
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        public static bool LessThan(double value1, double value2)
+        {
+            return ((value1 < value2) && !AreClose(value1, value2));
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        public static bool LessThanOrClose(double value1, double value2)
+        {
+            if (value1 >= value2)
+            {
+                return AreClose(value1, value2);
+            }
+            return true;
+        }
+    }
+}
+