添加项目文件。

Szmedi.RevitToolkit.Approval/Converters/WindowTitleBarIconVisibilityConverter.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;
+using System.Windows.Data;
+
+namespace Szmedi.RevitToolkit.Approval.Converters
+{
+    /// <summary>
+    /// Converts a <see cref="WindowStyle" /> and icon of a window into a <see cref="Visibility" /> for the icon.
+    /// </summary>
+    public class WindowTitleBarIconVisibilityConverter : IMultiValueConverter
+    {
+        /// <summary>
+        /// Creates a new <see cref="WindowTitleBarIconVisibilityConverter" />.
+        /// </summary>
+        public WindowTitleBarIconVisibilityConverter() { }
+
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            try
+            {
+                if (values != null && values.Length == 2)
+                {
+                    object icon = values[0];
+                    WindowStyle windowStyle = (WindowStyle)values[1];
+
+                    if (icon != null && (windowStyle == WindowStyle.SingleBorderWindow || windowStyle == WindowStyle.ThreeDBorderWindow))
+                    {
+                        return Visibility.Visible;
+                    }
+                    else
+                    {
+                        return Visibility.Collapsed;
+                    }
+                }
+            }
+            catch (Exception)
+            {
+                // use the default return value below
+            }
+
+            return Visibility.Visible;
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}