Question

I’ve a WPF app organized with tabs. I added a small button to each tabitem header that allow the user to close the tab.

When the user click on the small button, I remove the tabItem from the tabControl.

tabControl.Items.Remove(tabItem);

As result of this the tabItem dissapears, and that is fine, but here comes the problem:

The TabItem is not visible(good), but it still exists(bad). If I put a timer inside, the timer execucutes his Tick, and more important, if I’ve a datagrid with 200.000 records and I close the Tab, The garbage collector don’t release the memory as I expected.

I asked google about the problem and I’ve implemented some of the advices described. It didn’t work.

Can anyone help me? Thanks

Answer 1

This is what I’ve been using, and as far as I can tell it removes the tabitem from memory. The problem with leaving a timer inside of the tabitem, is that the GC won’t collect and dispose of it because it detects that the timer is still in use.

The Code:

namespace Reports.Controls {     /// <summary>     /// Interaction logic for Test.xaml     /// </summary>     public partial class ReportTab : TabItem     {         public delegate void CloseEvents(ReportTab TabIndex);         public event CloseEvents Closing;          public ReportTab(string Title)         {             InitializeComponent();             tbTitle.Text = Title;         }          private void Image_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)         {             Closing(this);         }     } } 

The xaml:

<TabItem x:Class='Reports.Controls.ReportTab'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     >     <TabItem.Header>         <StackPanel Orientation='Horizontal'>             <TextBlock Text='Main' Name='tbTitle' Margin='0,0,8,0'/>             <Image Height='13'                     Source='pack://application:,,/Images/Icons/close.png'                    MouseLeftButtonUp='Image_MouseLeftButtonUp'/>         </StackPanel>     </TabItem.Header>     <Grid>          //Tabitem stuff     </Grid> </TabItem> 

Here’s the page with the Tabcontrol to add a tab:

void AddTab(string Title) {     Controls.ReportTab rt = new Controls.ReportTab(Title);     rt.Closing += new Controls.ReportTab.CloseEvents(rt_Closing);     tabControl.SelectedIndex = tabControl.Items.Add(rt); }  /// <summary> /// Moves the Tab Control back to the Main tab /// after a tab is removed /// </summary> /// <param name='TabIndex'></param> void rt_Closing(Controls.ReportTab TabIndex) {     tabControl.Items.Remove(TabIndex);     //This resets the tabcontrol back to it's first tabindex     tabControl.SelectedIndex = 0;  }