结构调整，便于后续扩展

AIStudio.Wpf.BaseDiagram/Converters/BoolVisibilityConverter.cs

@@ -0,0 +1,50 @@
+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 AIStudio.Wpf.BaseDiagram.Converters
+{
+    public class BoolVisibilityConverter : IValueConverter
+    {
+        #region IValueConverter Members
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var visibility = value as bool?;
+            var visible = parameter as string;
+
+            if (visibility != null && visible != null)
+            {
+                if (visibility == true && visible == "true")
+                {
+                    return Visibility.Visible;
+                }
+                if (visibility == false && visible == "false")
+                {
+                    return Visibility.Visible;
+                }
+            }
+            else if (visibility != null)
+            {
+                if (visibility == true)
+                {
+                    return Visibility.Visible;
+                }
+            }
+
+            return Visibility.Collapsed;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return DependencyProperty.UnsetValue;
+        }
+
+        #endregion
+    }
+}