更新

WPFDark/Internals/Evaluator.cs

@@ -0,0 +1,22 @@
+using System.Data;
+
+namespace WPFDark.Internals
+{
+    internal static class Evaluator
+    {
+        internal static string Eval(string statement)
+        {
+            try
+            {
+                var result = _dataTable.Compute(statement,"");
+                return result?.ToString() ?? "";
+            }
+            catch
+            {
+                return "";
+            }
+        }
+
+        private static readonly DataTable _dataTable = new DataTable();
+    }
+}