WPF TreeView 后台C#选中指定的Item， 需要遍历

  

        private TreeViewItem FindTreeViewItem ( ItemsControl container , object item )

        {

            if ( null == container || null == item )

            {

                return null ;

            }

            if ( container . DataContext == item )

            {

                return container as TreeViewItem ;

            }

            int count = container . Items . Count ;

            for ( int i = 0; i < count ; i ++)

            {

                TreeViewItem subContainer = ( TreeViewItem ) container . ItemContainerGenerator . ContainerFromIndex ( i );

                if ( null == subContainer )

                {

                    continue ;

                }

                // Search the next level for the object.

                TreeViewItem resultContainer = FindTreeViewItem ( subContainer , item );

                if ( null != resultContainer )

                {

                    return resultContainer ;

                }

            }

            return null ;

        }

/////使用上述方法遍历 ， 然后设置IsSelected属性

   private static void SelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

        {

            //

            SelectedProtocolControl spc = d as SelectedProtocolControl ;

            if ( null != spc )

            {

                if ( e . NewValue != spc . trvSelectedProtocol . SelectedItem )

                {

                    //TreeViewItem tviNew = spc.trvSelectedProtocol.ItemContainerGenerator.ContainerFromItem(e.NewValue) as TreeViewItem;

                    TreeViewItem tviNew = spc . FindTreeViewItem ( spc . trvSelectedProtocol , e . NewValue );

                    if ( null != tviNew )

                    {

                        tviNew . IsSelected = true ;

                    }

                }

                if ( null != e . OldValue )

                {

                    //TreeViewItem tviOld = spc.trvSelectedProtocol.ItemContainerGenerator.ContainerFromItem(e.OldValue) as TreeViewItem;

                    TreeViewItem tviOld = spc . FindTreeViewItem ( spc . trvSelectedProtocol , e . OldValue );

                    if ( null != tviOld )

                    {

                        tviOld . IsSelected = false ;

                    }

                }

            }

            System . Diagnostics . Debug . WriteLine ( "SelectedItemChanged..." );

        }