添加项目文件。

Szmedi.RevitToolkit.Approval/Extensions/ParameterExtensions.cs

@@ -0,0 +1,102 @@
+using Autodesk.Revit.DB;
+
+namespace Szmedi.RevitToolkit.Approval.Extensions
+{
+    public static class ParameterExtensions
+    {
+        /// <summary>
+        ///     获取参数值
+        /// </summary>
+        /// <param name="parameter"></param>
+        /// <returns></returns>
+        public static object GetValue(this Parameter parameter)
+        {
+            if (parameter == null)
+            {
+                return null;
+            }
+            object result = null;
+            switch (parameter.StorageType)
+            {
+                case StorageType.None:
+                    break;
+
+                case StorageType.Integer:
+                    result = parameter.AsInteger();
+                    break;
+
+                case StorageType.Double:
+                    result = parameter.AsDouble();
+                    break;
+
+                case StorageType.String:
+                    //Revit数据库存储的值
+                    var str = parameter.AsString();
+                    if (string.IsNullOrEmpty(str))
+                    {
+                        //用户可见的前端显示，如根据单位设置而显示的值
+                        result = parameter.AsValueString();
+                    }
+                    else
+                    {
+                        result = str;
+                    }
+                    break;
+
+                case StorageType.ElementId:
+                    result = parameter.AsElementId();
+                    break;
+            }
+
+            return result;
+        }
+        public static bool SetValue(this Parameter parameter, object value)
+        {
+            var result = false;
+            if (parameter == null || value == null)
+            {
+                //throw new ArgumentException(nameof(parameter));
+                return false;
+            }
+            if (!parameter.IsReadOnly)
+            {
+                switch (parameter.StorageType)
+                {
+                    case StorageType.Integer:
+                        if (value is int i)
+                        {
+                            result = parameter.Set(i);
+                        }
+
+                        break;
+                    case StorageType.Double:
+                        if (value is double d)
+                        {
+                            result = parameter.Set(d);
+                        }
+
+                        break;
+
+                    case StorageType.String:
+                        if (value is string str)
+                        {
+                            result = parameter.Set(str);
+                        }
+
+                        break;
+
+                    case StorageType.ElementId:
+                        if (value is ElementId id)
+                        {
+                            result = parameter.Set(id);
+                        }
+
+                        break;
+                }
+            }
+
+            return result;
+        }
+
+    }
+}