StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POCSLA Silverlight project (C#) Sample N-Tier Application (Adding Delete Functionality)
primarykey
Id
11421940
data
AcceptedAnswerId
0
AnswerCount
2
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2012-07-10T21:05:56.060
FavoriteCount
0
LastActivityDate
2012-07-12T15:03:06.687
LastEditDate
2012-07-12T11:55:41.740
LastEditorUserId
50776
OwnerUserId
706673
ParentId
0
PostTypeId
1
Score
0
ViewCount
780
LastEditorDisplayName
text
Body
I know this is a very specific question, but I'm trying to get a grasp on the CSLA framework. I've successfully loaded up the "Sample N-Tier" application that can be found here: <a href="http://lhotka.net/files/csla40/CslaSamples-4.3.13.zip" rel="nofollow">http://lhotka.net/files/csla40/CslaSamples-4.3.13.zip</a> The Sample N-Tier silverlight application allows you to add LineItem objects to a collection LineItems, which, along with a Customer Name and Customer ID field make up the Order object. I'm trying to expand the functionality of the app as an exercise making the line items deletable. The code below is from the OrderVM.cs file and defines the functionality of the "Add" button click event. It invokes the Model.LineItems.AddNew() method, which doesn't take any parameters. I want to delete the selected LineItem, rather than just the first item, as I've got it coded write now. My code works, but I cannot figure out how to retrieve a LineItem object or an index/id of the line that I have currently selected. <pre><code>namespace SilverlightUI { public class OrderVm : ViewModel<BusinessLibrary.Order> { public OrderVm() { //BeginRefresh(BusinessLibrary.Order.NewOrder); BeginRefresh(callback => BusinessLibrary.Order.GetOrder(231, callback)); } protected override void OnError(Exception error) { Bxf.Shell.Instance.ShowError(error.Message, "Error"); } public override void AddNew(object sender, ExecuteEventArgs e) { Model.LineItems.AddNew(); } public override void Remove(object sender, ExecuteEventArgs e) { //Bxf.Shell.Instance.ShowError(Model.LineItems.AllowRemove.ToString(), "Delete"); if(Model.LineItems.Count>0) Model.LineItems.RemoveAt(0); } } } </code></pre> Could someone explain how to go about retrieving a LineItem Object from the selected DataGrid Row? Thanks! EDIT: Posted below is the XAML for the OrderEdit.xaml file. <pre><code> <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:csla="clr-namespace:Csla.Xaml;assembly=Csla.Xaml" xmlns:cslaRules="clr-namespace:Csla.Rules;assembly=Csla" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" xmlns:my="clr-namespace:SilverlightUI" xmlns:System="clr-namespace:System;assembly=mscorlib" xmlns:c="clr-namespace:System.Windows.Controls;assembly=System.Windows" xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions" x:Class="SilverlightUI.OrderEdit" mc:Ignorable="d" d:DesignHeight="410" d:DesignWidth="667" Loaded="UserControl_Loaded"> <UserControl.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="./Themes/CslaSampleResources.xaml" /> </ResourceDictionary.MergedDictionaries> <CollectionViewSource x:Key="orderVmViewSource" d:DesignSource="{d:DesignInstance my:OrderVm, CreateList=True}" /> <CollectionViewSource x:Key="orderVmLineItemsViewSource" Source="{Binding LineItems, Source={StaticResource orderVmViewSource}}" /> </ResourceDictionary> </UserControl.Resources> <Border Padding="0,10,0,0" CornerRadius="10,10,0,0"> <Border.Background> <LinearGradientBrush EndPoint="1.005,0.5" StartPoint="0,0.5"> <GradientStop Color="#7FFFFFFF" Offset="0"/> <GradientStop Color="#99FFFFFF" Offset="1"/> </LinearGradientBrush> </Border.Background> <Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource orderVmViewSource}}"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <TextBlock Text="Customer Id:" Grid.Column="0" Grid.Row="0" Style="{StaticResource LabelTextStyle}" /> <TextBox Grid.Column="1" Grid.Row="0" x:Name="idTextBox" Text="{Binding Model.Id, Mode=OneWay}" Style="{StaticResource TextBoxStyle}" /> <TextBlock Text="Customer Name:" Grid.Column="0" Grid.Row="1" Style="{StaticResource LabelTextStyle}" /> <TextBox Grid.Column="1" Grid.Row="1" x:Name="customerNameTextBox" Text="{Binding Model.CustomerName, Mode=TwoWay, ValidatesOnNotifyDataErrors=False}" Style="{StaticResource TextBoxStyle}" />  <TextBlock Grid.Row="2" Grid.ColumnSpan="2" Text="orders" Style="{StaticResource SubHeadingTextStyle}" Margin="10,15,0,0" /> <sdk:DataGrid Grid.Row="3" Grid.ColumnSpan="2" AutoGenerateColumns="False" ItemsSource="{Binding Model.LineItems}" x:Name="lineItemsDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" RowBackground="{x:Null}" BorderBrush="{x:Null}" HorizontalGridLinesBrush="{x:Null}" VerticalGridLinesBrush="{x:Null}" GridLinesVisibility="None" Background="White" ColumnHeaderHeight="35" ColumnHeaderStyle="{StaticResource DataGridHeaderStyle}" RowStyle="{StaticResource DataGridRowStyle}" CellStyle="{StaticResource DataGridCellStyle}"> <sdk:DataGrid.Columns> <sdk:DataGridTextColumn x:Name="idColumn" Binding="{Binding Id}" Header="ID" Width="Auto" /> <sdk:DataGridTextColumn x:Name="nameColumn" Binding="{Binding Name}" Header="NAME" Width="*" /> </sdk:DataGrid.Columns> </sdk:DataGrid> <Button Grid.Row="3" Grid.Column="1" x:Name="AddNewButton" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,5,10,5" Style="{StaticResource AddButtonStyle}" /> <csla:TriggerAction TargetControl="{Binding ElementName=AddNewButton}" MethodName="AddNew" DataContext="{Binding CurrentItem}" /> <Button Grid.Row="3" Grid.Column="1" x:Name="DeleteButton" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,5,10,5" /> <csla:TriggerAction TargetControl="{Binding ElementName=DeleteButton}" MethodName="Remove" DataContext="{Binding CurrentItem}" /> <Border Grid.Row="4" Grid.ColumnSpan="2" Background="#FFE0E0E0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" /> <StackPanel Grid.Row="4" x:Name="stackPanel1" DataContext="{Binding CurrentItem}" Orientation="Horizontal" VerticalAlignment="Center" HorizontalAlignment="Right" Grid.Column="1"> <Button Content="cancel" x:Name="CancelButton" IsEnabled="{Binding CanCancel}" Margin="3" Style="{StaticResource CslaButtonStyle}" /> <Button Content="save" x:Name="SaveButton" IsEnabled="{Binding CanSave}" Margin="3" Style="{StaticResource CslaButtonStyle}" /> <csla:TriggerAction TargetControl="{Binding ElementName=SaveButton}" MethodName="Save"/> <csla:TriggerAction TargetControl="{Binding ElementName=CancelButton}" MethodName="Cancel"/> </StackPanel> <StackPanel Grid.Row="4" Orientation="Horizontal"> <Rectangle Style="{StaticResource DecoratorRectangle}"/> <Rectangle Style="{StaticResource DecoratorRectangle}"/> <Rectangle Style="{StaticResource DecoratorRectangle}"/> <Rectangle Style="{StaticResource DecoratorRectangle}"/> </StackPanel> </Grid> </Border> </UserControl> </code></pre> <hr> I believe in order to access the ListItem that is selected in the DataGrid I have to somehow bind the SelectedItem property of the DataGrid to a property in my ViewModel, am I understanding this correctly? I could add something like: <pre><code>SelectedItem="{Binding ViewModel.SelectedListItem}", </code></pre> to the XAML DataGrid element, but I'm still a little unclear what to put for the binding property to actually get it to set the property in my OrderVm.cs... could someone help me with what to put for the Binding? Thanks!
Tags
<c#><silverlight><business-objects><csla>
Title
CSLA Silverlight project (C#) Sample N-Tier Application (Adding Delete Functionality)
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. UScasperOne
UserOwnerUserId
1. USJosh
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. COIf you post the xaml for your UI we can also point out how to make sure that your selected object is passed to the method in such a way as to use it within the event...
 singulars
 PostPostId
 POCSLA Silverlight project (C#) Sample N-Tier Application (Adding Delete Functionality)
 UserUserId
 USEtherDragon
2. COI am not on my work computer but i posted the xaml from the demo, so the button appears on top of the other but that shouldn't matter for the purpose of the explanation. Thanks EtherDragon!
 singulars
 PostPostId
 POCSLA Silverlight project (C#) Sample N-Tier Application (Adding Delete Functionality)
 UserUserId
 USJosh

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.