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  [Collapse]DevExpress.XtraNavBar
   [Expand]Collection Class
   [Expand]CollectionItemEventArgs Class
    CollectionItemEventHandler Delegate
   [Expand]ComponentCollectionItem Class
   [Expand]ICollectionItem Interface
    LinkSelectionModeType Enumeration
   [Expand]NavBarAppearances Class
   [Expand]NavBarCalcGroupClientHeightEventArgs Class
    NavBarCalcGroupClientHeightEventHandler Delegate
   [Expand]NavBarCalcHintSizeEventArgs Class
    NavBarCalcHintSizeEventHandler Delegate
   [Collapse]NavBarControl Class
     NavBarControl Members
     NavBarControl Constructor
    [Expand]NavBarControl Properties
    [Expand]NavBarControl Events
    [Collapse]NavBarControl Methods
      About Method
      BeginInit Method
      BeginUpdate Method
      CalcCollapsedPaneWidth Method
      CalcHitInfo Method
      EndInit Method
      EndUpdate Method
      GetAllowSelectedLink Method
      GetDragDropFlags Method
      GetHideGroupCaptions Method
      GetToolTipController Method
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      HideNavPaneForm Method
      LayoutChanged Method
      NavPaneShowCollapsedGroupContent Method
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      RestoreFromStream Method
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   [Expand]NavBarCustomDrawHintEventArgs Class
    NavBarCustomDrawHintEventHandler Delegate
   [Expand]NavBarCustomHintEventArgs Class
    NavBarDragDrop Enumeration
   [Expand]NavBarGetHintEventArgs Class
    NavBarGetHintEventHandler Delegate
   [Expand]NavBarGroup Class
   [Expand]NavBarGroupControlContainer Class
   [Expand]NavBarGroupEventArgs Class
    NavBarGroupEventHandler Delegate
    NavBarGroupStyle Enumeration
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    NavBarHitTest Enumeration
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   [Expand]NavBarItem Class
   [Expand]NavBarItemLink Class
   [Expand]NavBarLayoutOptions Class
   [Expand]NavBarLinkEventArgs Class
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    NavBarState Enumeration
    NavBarStringId Enumeration
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   [Expand]NavGroupCollection Class
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   [Expand]NavLinkCollection Class
    NavPaneState Enumeration
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   [Expand]OptionsNavPane Class
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 End-User Documentation

NavBarControl.BeginUpdate Method

Locks the NavBarControl object by preventing visual updates of the object and its elements until the EndUpdate method is called.

Namespace:DevExpress.XtraNavBar
Assembly:DevExpress.XtraNavBar.v17.1.dll

Expanded Syntax

Expanded Remarks

The BeginUpdate and EndUpdate methods allow you to avoid flickering while performing batch modifications to the NavBarControl's settings. Once the BeginUpdate method has been called, modifying settings of the NavBarControl and its elements does not cause an immediate visual update. So, multiple modifications can be made to the object and its elements without a major impact on performance or screen flickering. After all the desired operations have been finished, call the EndUpdate method.

The BeginUpdate and EndUpdate methods use an internal counter to implement the update functionality. The counter's initial value is 0. Visual updates are forbidden if the counter's value is greater than 0, and the updates are enabled if the counter's value is 0. The BeginUpdate method increments the counter. The EndUpdate method decrements the counter. If the counter's new value is 0, an immediate visual update occurs. Each call to BeginUpdate must be paired with a call to EndUpdate. To ensure that EndUpdate is always called even if an exception occurs, use the try...finally statement.

Expanded Example

The following sample code assigns background images to the XtraNavBar and its groups. The NavBarGroup.BackgroundImage and GroupBackgroundImage properties are used for this purpose. The BeginUpdate and EndUpdate methods are used to avoid repeated redrawing when changes are implemented.

The image below shows the nav bar before and after the code below has been executed.

Expanded See Also

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