In my application I have a RadGridView and a Data Form. If I change the group or type of the DocumentTitle on the CombBox in Data Form, I get the following error message:
"The property 'Id' is part of the object's key information and cannot be modified."
XAML-Code (DataGrid):
01.<telerik:RadEntityFrameworkDataSourceName="DocumentTitlesDataSource"QueryName="DocumentTitles">02. </telerik:RadEntityFrameworkDataSource>03. 04. <telerik:RadGridViewx:Name="Entries"Grid.Row="1"05. ItemsSource="{Binding DataView, ElementName=DocumentTitlesDataSource}"06. SelectedItem="{Binding DataView.CurrentItem, Mode=OneWay, ElementName=DocumentTitlesDataSource}"07. SelectionMode="Single"08. IsReadOnly="True"09. AutoGenerateColumns="False"10. IsSynchronizedWithCurrentItem="True"11. CanUserDeleteRows="False"12. CanUserFreezeColumns="False"13. CanUserInsertRows="False"14. CanUserReorderColumns="False"15. CanUserResizeColumns="False"16. CanUserSortColumns="False"17. CanUserSortGroups="False"18. IsFilteringAllowed="False"19. ShowGroupPanel="False"20. ShowColumnHeaders="False"SelectionChanging="Entries_SelectionChanging">21. <telerik:RadGridView.Columns>22. <telerik:GridViewDataColumnDataMemberBinding="{Binding Id}"Header="Id"Width="20"IsVisible="False"/>23. <telerik:GridViewDataColumnDataMemberBinding="{Binding User.Id}"Header="Benutzer"Width="10"IsVisible="False"/>24. <telerik:GridViewDataColumnDataMemberBinding="{Binding Computer}"Header="Computer"Width="10"IsVisible="False"/>25. <telerik:GridViewDataColumnDataMemberBinding="{Binding Name}"Header="Dokumententitel"Width="*"/>26. <telerik:GridViewDataColumnDataMemberBinding="{Binding Group.Id}"Header="Dokumentengruppe"Width="200"/>27. <telerik:GridViewComboBoxColumnx:Name="cbxDocumentTitleGroup"DataMemberBinding="{Binding Group.Id}"28. DisplayMemberPath="Name"29. SelectedValueMemberPath="Id"30. Header="Dokumentengruppe"31. Width="100"/>32. <telerik:GridViewComboBoxColumnx:Name="cbxDocumentTitleType"DataMemberBinding="{Binding Type.Id}"33. DisplayMemberPath="Name"34. SelectedValueMemberPath="Id"35. Header="Dokumententyp"36. Width="100"/>37. <telerik:GridViewDataColumnDataMemberBinding="{Binding System}"Header="System"Width="10"IsVisible="False"/>38. <telerik:GridViewDataColumnDataMemberBinding="{Binding Locked}"Header="Gesperrt"Width="10"IsVisible="False"/>39. </telerik:RadGridView.Columns>40. </telerik:RadGridView>XAML-Code (DataForm):
01.<Grid.Resources> 02. <DataTemplatex:Key="WriteTemplate">03. <Grid>04. <Grid.ColumnDefinitions>05. <ColumnDefinitionWidth="150"></ColumnDefinition>06. <ColumnDefinitionWidth="*"></ColumnDefinition>07. </Grid.ColumnDefinitions>08. <Grid.RowDefinitions>09. <RowDefinition></RowDefinition>10. <RowDefinition></RowDefinition>11. <RowDefinition></RowDefinition>12. <RowDefinition></RowDefinition>13. <RowDefinition></RowDefinition>14. </Grid.RowDefinitions>15. <LabelGrid.Row="0"Grid.Column="0"Margin="0,5,0,0">Dokumententitel:</Label>16. <LabelGrid.Row="1"Grid.Column="0"Margin="0,5,0,0">Dokumentengruppe:</Label>17. <LabelGrid.Row="2"Grid.Column="0"Margin="0,5,0,0">Dokumententyp:</Label>18. <LabelGrid.Row="3"Grid.Column="0"Margin="0,5,0,0">Gesperrt:</Label>19. <LabelGrid.Row="4"Grid.Column="0"Margin="0,5,0,0">Systemeintrag:</Label>20. <telerik:DataFormDataFieldGrid.Row="0"Grid.Column="1"DataMemberBinding="{Binding Name , Mode=TwoWay}"HorizontalAlignment="Stretch"LabelPosition="Above"Margin="0,5,0,0"/>21. <telerik:DataFormComboBoxFieldGrid.Row="1"Grid.Column="1"HorizontalAlignment="Stretch"LabelPosition="Above"Margin="0,5,0,0"22. ItemsSource="{Binding ItemsSource, ElementName=cbxDocumentTitleGroup, Mode=TwoWay}"23. DataMemberBinding="{Binding Group.Id}"24. DisplayMemberPath="Name"25. SelectedValuePath="Id"26. SelectedIndex="{Binding Group}"/>27. <telerik:DataFormComboBoxFieldGrid.Row="2"Grid.Column="1"HorizontalAlignment="Stretch"LabelPosition="Above"Margin="0,5,0,0"28. ItemsSource="{Binding ItemsSource, ElementName=cbxDocumentTitleType}"29. DataMemberBinding="{Binding Type.Id}"30. DisplayMemberPath="Name"31. SelectedValuePath="Id"32. SelectedIndex="{Binding Type}"/>33. <telerik:DataFormCheckBoxFieldGrid.Row="3"Grid.Column="1"DataMemberBinding="{Binding Locked , Mode=TwoWay}"HorizontalAlignment="Stretch"LabelPosition="Above"Margin="0,5,0,0"/>34. <telerik:DataFormCheckBoxFieldGrid.Row="4"Grid.Column="1"IsReadOnly="True"DataMemberBinding="{Binding System , Mode=TwoWay}"HorizontalAlignment="Stretch"LabelPosition="Above"Margin="0,5,0,0"/> 35. </Grid>36. </DataTemplate>37. </Grid.Resources> 38. 39. <telerik:RadDataFormx:Name="EntryDetails"Grid.Row="2"Header="Dokumententitel"40. CommandButtonsVisibility="Cancel, Commit"AutoGenerateFields="False"AutoCommit="False"41. EditEnding="EntryDetails_EditEnding" ValidatingItem="EntryDetails_ValidatingItem"EditEnded="EntryDetails_EditEnded"42. ReadOnlyTemplate="{StaticResource ReadTemplate}"43. EditTemplate="{StaticResource WriteTemplate}"44. NewItemTemplate="{StaticResource WriteTemplate}"45. ItemsSource="{Binding DataView, ElementName=DocumentTitlesDataSource}"/> C# Code:
01.public DocimpDocumentTitles(VIMANTO.Environment My)02. {03. InitializeComponent();04. my = My;05. db.Database.Connection.ConnectionString = my.CurrentConnection.GetSqlConntectionString();06. DocumentTitlesDataSource.DbContext = db;07. 08. ObservableCollection<CatalogEntry> documentTitleGroups = new ObservableCollection<CatalogEntry>();09. ObservableCollection<CatalogEntry> documentTitleTypes = new ObservableCollection<CatalogEntry>();10. 11. documentTitleGroups = Database.Views.CatalogViews.GetCatalogEntries(my.CurrentConnection, VIMANTO.Database.Views.CatalogViews.GetCatalog(my.CurrentConnection, "Dokumentengruppen").Id, true);12. cbxDocumentTitleGroup.ItemsSource = documentTitleGroups;13. 14. documentTitleTypes = Database.Views.CatalogViews.GetCatalogEntries(my.CurrentConnection, VIMANTO.Database.Views.CatalogViews.GetCatalog(my.CurrentConnection, "Dokumententypen").Id, true);15. cbxDocumentTitleType.ItemsSource = documentTitleTypes;16. }
