添加项目文件。

Szmedi.RvKits/Converters/WindowCaptionButtonEnabledConverter.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;
+
+namespace Szmedi.RvKits.Converters
+{
+    /// <summary>
+    /// Converts a <see cref="ResizeMode" /> of a window into an enabled state of an according caption button.
+    /// </summary>
+    public class WindowCaptionButtonEnabledConverter : WindowCaptionButtonBaseConverter
+    {
+        /// <summary>
+        /// Creates a new <see cref="WindowCaptionButtonEnabledConverter" />.
+        /// </summary>
+        public WindowCaptionButtonEnabledConverter() : base() { }
+
+        public override object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            try
+            {
+                if (values != null && values.Length == 2)
+                {
+                    string buttonName = (string)values[0];
+                    ResizeMode resizeMode = (ResizeMode)values[1];
+
+                    if (buttonName == CloseButtonName)
+                    {
+                        return true;
+                    }
+                    else if (buttonName == MinimizeButtonName)
+                    {
+                        return resizeMode != ResizeMode.NoResize;
+                    }
+                    else if (buttonName == MaximizeRestoreButtonName)
+                    {
+                        return resizeMode != ResizeMode.NoResize && resizeMode != ResizeMode.CanMinimize;
+                    }
+                }
+            }
+            catch (Exception)
+            {
+                // use the default return value below
+            }
+
+            return true;
+        }
+    }
+}