refactor the code

ILSpy/ILSpy.csproj

@@ -170,6 +170,7 @@
       <SubType>Code</SubType>
     </Compile>
     <Compile Include="Options\MiscSettings.cs" />
+    <Compile Include="Options\MiscSettingsLoader.cs" />
     <Compile Include="Options\MiscSettingsPanel.xaml.cs">
       <DependentUpon>MiscSettingsPanel.xaml</DependentUpon>
     </Compile>

ILSpy/Options/MiscSettings.cs

@@ -1,8 +1,4 @@
-using System;
+using System.ComponentModel;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Linq;
-using System.Text;
 
 namespace ICSharpCode.ILSpy.Options
 {

ILSpy/Options/MiscSettingsLoader.cs

@@ -0,0 +1,34 @@
+using System.Xml.Linq;
+
+namespace ICSharpCode.ILSpy.Options
+{
+	public interface IMiscSettingsLoader
+	{
+		MiscSettings LoadMiscSettings(ILSpySettings settings);
+	}
+
+	public class MiscSettingsLoader : IMiscSettingsLoader
+	{
+		public MiscSettings LoadMiscSettings(ILSpySettings settings)
+		{
+			XElement e = settings["MiscSettings"];
+			MiscSettings s = new MiscSettings();
+			s.AllowMultipleInstances = (bool?)e.Attribute("allowMultipleInstance") ?? s.AllowMultipleInstances;
+			return s;
+		}
+	}
+
+	public static class MiscSettingsInstance
+	{
+		private static MiscSettingsLoader current;
+
+		public static MiscSettingsLoader Current
+		{
+			get
+			{
+				current = current ?? new MiscSettingsLoader();
+				return current;
+			}
+		}
+	}
+}

ILSpy/Options/MiscSettingsPanel.xaml.cs

@@ -1,17 +1,4 @@
-using ICSharpCode.Decompiler;
+using System.Windows.Controls;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Windows;
-using System.Windows.Controls;
-using System.Windows.Data;
-using System.Windows.Documents;
-using System.Windows.Input;
-using System.Windows.Media;
-using System.Windows.Media.Imaging;
-using System.Windows.Navigation;
-using System.Windows.Shapes;
 using System.Xml.Linq;
 
 namespace ICSharpCode.ILSpy.Options
@@ -29,15 +16,7 @@ namespace ICSharpCode.ILSpy.Options
 
 		public void Load(ILSpySettings settings)
 		{
-			this.DataContext = LoadDecompilerSettings(settings);
+			this.DataContext = MiscSettingsInstance.Current.LoadMiscSettings(settings);
-		}
-
-		private MiscSettings LoadDecompilerSettings(ILSpySettings settings)
-		{
-			XElement e = settings["MiscSettings"];
-			MiscSettings s = new MiscSettings();
-			s.AllowMultipleInstances = (bool?)e.Attribute("allowMultipleInstance") ?? s.AllowMultipleInstances;
-			return s;
 		}
 
 		public void Save(XElement root)