I need to create two UserControls, one is inside the other. Each has a DataGrid that displays information from different database tables.

Problem: I was able to configure everything for an external UserControl, but the internal one either automatically intercepts the parent's DataContext (and displays incorrect data in the DataGrid), or (when I try to set the DataContext directly) does not display anything at all, although, judging by the code, getting information from DB passes normally.

External UserControl:

<UserControl x:Class="AppM.Views.ListViews.UserListView" 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:viewModels="clr-namespace:AppM.ViewModels" xmlns:service="clr-namespace:AppM.Base" xmlns:commandBehaviors="clr-namespace:AppM.CommandBehaviors" xmlns:local="clr-namespace:AppM.Views.FormViews" xmlns:listViews="clr-namespace:AppM.Views.ListViews" service:DialogService.IsRegisteredView="True" mc:Ignorable="d" d:DataContext="{d:DesignInstance viewModels:UsersViewModel}" d:DesignHeight="300" d:DesignWidth="300"> <UserControl.Resources> <ResourceDictionary> <listViews:RoleValueConverter x:Key="roleValueConverter" /> </ResourceDictionary> </UserControl.Resources> <Grid> <StackPanel Orientation="Vertical"> <StackPanel Orientation="Horizontal"> <Button HorizontalAlignment="Left" Margin="5" MinWidth="120">Обновить</Button> </StackPanel> <Expander Header="Пользователи" Margin="5"> <StackPanel Orientation="Vertical"> <StackPanel Orientation="Horizontal"> <Button>Создать</Button> <Button>Редактировать</Button> <Button>Удалить</Button> </StackPanel> <DataGrid ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}"> <DataGrid.Columns> <DataGridTextColumn Binding="{Binding Path=Label}" Header="Логин" Width="0.75*"/> <DataGridTextColumn Binding="{Binding Path=Name}" Header="ФИО" Width="2*"/> <DataGridTextColumn Binding="{Binding Path=DateBirth, StringFormat='{}{0:dd.MM.yyyy}'}" Header="Дата рождения" Width="0.75*"/> <DataGridTextColumn Binding="{Binding Path=USERROLE, Converter={StaticResource roleValueConverter}}" Header="Роль" Width="*"/> </DataGrid.Columns> </DataGrid> </StackPanel> </Expander> <!-- Внутренний UserControl здесь --> <Expander Header="Роли" Margin="5"> <local:UserRoleView HorizontalAlignment="Stretch" DataContext="{Binding viewModels:UserRoleViewModel}"/> <!-- судя по всему, не работает--> </Expander> </StackPanel> </Grid>

Internal UserControl:

 <UserControl x:Class="AppM.Views.FormViews.UserRoleView" 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:viewModels="clr-namespace:AppM.ViewModels" xmlns:service="clr-namespace:AppM.Base" xmlns:commandBehaviors="clr-namespace:AppM.CommandBehaviors" xmlns:local="clr-namespace:AppM.Views.FormViews" xmlns:listViews="clr-namespace:AppM.Views.ListViews" service:DialogService.IsRegisteredView="True" mc:Ignorable="d" d:DataContext="{d:DesignInstance viewModels:UserRoleViewModel}" > <!-- Если добавить DataContext="{Binding Source={x:Static viewModels:UserRoleViewModel}}" - не может найти UserRoleViewModel --> <!-- Если добавить DataContext="{Binding viewModels:UserRoleViewModel}" - просто ничего не показывает в DataGrid --> <UserControl.Resources> <ResourceDictionary> </ResourceDictionary> </UserControl.Resources> <Grid> <StackPanel Orientation="Vertical"> <StackPanel Orientation="Horizontal"> <Button>Создать</Button> <Button>Редактировать</Button> <Button>Удалить</Button> </StackPanel> <DataGrid ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}"> <DataGrid.Columns> <DataGridTextColumn Binding="{Binding Path=Label}" Header="Наименование" Width="2*"/> <DataGridTextColumn Binding="{Binding Path=AccessLevel}" Header="Доступ" Width="3*"/> </DataGrid.Columns> </DataGrid> </StackPanel> </Grid>

Please help.

Question after: maybe it would be more logical to move the DataGrid to separate UserControls, which will both be in the third UserControl?

    1 answer 1

    Here is this line, what do you do ?:

     <local:UserRoleView HorizontalAlignment="Stretch" DataContext="{Binding viewModels:UserRoleViewModel}"/>

    You somewhere have a class, UserRoleViewModel , but first you need to create an instance of it, where do you have this instance? You see what is written in the Output window of Visual Studio, when you run the program, you can see errors there.

    You can, of course, create it directly in XAML, then it will look something like this:

     <local:UserRoleView HorizontalAlignment="Stretch"> <local:UserRoleView.DataContext> <viewModels:UserRoleViewModel /> </local:UserRoleView.DataContext> <local:UserRoleView/>

    But if this object is already created somewhere, then you need to think how to transfer it here. Through parent DataContext , most likely.