ドキュメントを切り替えた場合、検索結果を保持するイテレーターをnullにすべきだった

diff --git a/WPF/Test/MainWindow.xaml.cs b/WPF/Test/MainWindow.xaml.cs
index cd73649..601299a 100644 (file)
--- a/WPF/Test/MainWindow.xaml.cs
+++ b/WPF/Test/MainWindow.xaml.cs
@@ -219,12 +219,15 @@ namespace Test
         private void MenuItem_Click_14(object sender, RoutedEventArgs e)
         {
             this.fooTextBox.Document = this.Documents[0];
+            this.it = null;
+            this.InvalidateVisual();
             MessageBox.Show("Current Document is Document1");
         }
 
         private void MenuItem_Click_15(object sender, RoutedEventArgs e)
         {
             this.fooTextBox.Document = this.Documents[1];
+            this.it = null;
             this.InvalidateVisual();
             MessageBox.Show("Current Document is Document2");
         }