[WPF] Use element of another UserControl

Question

Hi I have included an UserControl B into another UserControl A.... so I would refresh/update the datagrid dgPlan defined in UserControl A from UserControl B. The application give me an error because dgPlna is not defined how can I defined it in UserControl B? Thanks.

Roberto Salemi · Answer

Resolved thanks to an external user in UserControlA: public void RefreshDataGrid(IEnumerable itemsSource) { dgPlan.ItemsSource = itemsSource; } in UserControlB: void bntSearch_Click(object sender RoutedEventArgs e) { MyProject.Views.UserControlA uc = FindParent (this); if (uc != null) { uc.RefreshDataGrid(myCollection); } } private static T FindParent (DependencyObject dependencyObject) where T : DependencyObject { var parent = VisualTreeHelper.GetParent(dependencyObject); if (parent == null) return null; var parentT = parent as T; return parentT ?? FindParent (parent); } Thanks.

Roberto Salemi · Answer

Hi this is my code: UserControlA x:Name=UserControlUserControlA xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation xmlns:x=http://schemas.microsoft.com/winfx/2006/xaml xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006 xmlns:d=http://schemas.microsoft.com/expression/blend/2008 xmlns:mui=http://firstfloorsoftware.com/ModernUI xmlns:sys=clr-namespace:System;assembly=mscorlib xmlns:staticData=clr-namespace:MyProject.Views mc:Ignorable=d d:DesignHeight=381 d:DesignWidth=1200 Unloaded=UserControl_Unloaded> AlternatingRowBackground={StaticResource RowAlternateColorBackground} GridLinesVisibility=All VerticalGridLinesBrush={StaticResource GridLineColor} HorizontalGridLinesBrush={StaticResource GridLineColor} IsReadOnly=False CanUserAddRows=False> [MY_COLUMNS] UserControlB x:Name=UserControlUserControlB xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation xmlns:x=http://schemas.microsoft.com/winfx/2006/xaml xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006 xmlns:d=http://schemas.microsoft.com/expression/blend/2008 xmlns:mui=http://firstfloorsoftware.com/ModernUI xmlns:sys=clr-namespace:System;assembly=mscorlib xmlns:staticData=clr-namespace:MyProject.Views mc:Ignorable=d d:DesignHeight=381 d:DesignWidth=1200> [MY_CONTENT] dgPlan is my DataGrid in UserControlA. When the user click on bntSearch button in UserControlB dgPlan must be updated with the new data. Thanks.

Tom Mohan · Answer

Colud you share the code and error which you are getting .