添加项目文件。

Szmedi.Toolkit.Revit/Extensions/DoubleExtensions.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace Szmedi.Toolkit.Extensions
+{
+    public static class DoubleExtensions
+    {
+        /// <summary>
+        ///     角度转弧度
+        /// </summary>
+        /// <param name="degree"></param>
+        /// <returns></returns>
+        public static double ToRadian(this double degree)
+        {
+            return degree * Math.PI / 180.0;
+        }
+        /// <summary>
+        ///     弧度转角度
+        /// </summary>
+        /// <param name="radian"></param>
+        /// <returns></returns>
+        public static double ToDegree(this double radian)
+        {
+            return radian * 180.0 / Math.PI;
+        }
+    }
+}