添加项目文件。

Szmedi.RevitToolkit.Approval/Converters/ElementToElementTypeNameConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+using Autodesk.Revit.DB;
+
+namespace Szmedi.RevitToolkit.Approval.Converters
+{
+    class ElementToElementTypeNameConverter : IValueConverter
+    {
+        public static readonly ElementToElementTypeNameConverter Instance = new ElementToElementTypeNameConverter();
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is Element element)
+            {
+                if (element.GetTypeId() != ElementId.InvalidElementId)
+                {
+                    var type = element.Document.GetElement(element.GetTypeId()) as ElementType;
+                    return type.FamilyName;
+                }
+            }
+            return System.Windows.Data.Binding.DoNothing; // 如果不是Element类型或没有类型ID，则返回Binding.DoNothing
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}