Datagrid not showing data even though its boudn - mvvm

Question

I have a problem with my MVVM Light implementation where I have my WPF Toolkit DataGrid and Data context bound to the correct object but no data is showing up. Can someone tell me what I'm doing wrong?
Here is my code:
MainViewModel.cs
public class MainViewModel : ViewModelBase
{
private static Logger logger = LogManager.GetCurrentClassLogger();
private C.Wsi.ClientSession privateSession;
private ObservableCollection<CashAccount> _cashaccounts;
public ObservableCollection<CashAccount> CashAccounts
{
get { return _cashaccounts; }
set
{
if (_cashaccounts.Equals(value))
{
return;
}
_cashaccounts = value;
RaisePropertyChanged("CashAccounts");
}
}
/// <summary>
/// Initializes a new instance of the MainViewModel class.
/// </summary>
public MainViewModel()
{
if (IsInDesignMode)
{
// Code runs in Blend --> create design time data.
}
else
{
_cashaccounts = new ObservableCollection<CashAccount>();
// Subscribe to CollectionChanged event
_cashaccounts.CollectionChanged += OnCashAccountListChanged;
logger.Info("----- Start -----");
// Code runs "for real"
Cs.Helper.Session session = new Session();
privateSession = session.getSession();
logger.Info("Private Session: " + privateSession.GetHashCode());
logger.Info("...Connected.....");
Cs.Helper.ResultSet results = new ResultSet();
PositionBean[] pos = results.getPositions(privateSession);
logger.Info("Positions returned: " + pos.Length);
SecurityBean[] secs = results.getSecurities(privateSession);
logger.Info("Securities returned: " + secs.Length);
ArrayBuilder ab = new ArrayBuilder(pos, secs);
CashAccount c = new CashAccount();
c.qtySod = 100.00;
c.name = "Hi";
c.account = "Acct1";
c.cashAmount = 67.00;
_cashaccounts.Add(c);
RaisePropertyChanged("CashAccounts");
//this._cashaccounts=ab.joinPositionSecurities();
}
}
void OnCashAccountListChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
}
////public override void Cleanup()
////{
//// // Clean up if needed
//// base.Cleanup();
////}
}
MainWindow.xaml
<Window x:Class="CreditSuisse.MainWindow"
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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:CreditSuisse.Helper"
xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit"
mc:Ignorable="d"
Height="301"
Width="520"
Title="Credit Suisse - Custodial Cash Application"
DataContext="{Binding Path=Main, Source={StaticResource Locator}}">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Skins/MainSkin.xaml" />
</ResourceDictionary.MergedDictionaries>
<local:VisibilityConverter x:Key="VisibilityConverter" />
<!-- DataGrid Background -->
<LinearGradientBrush x:Key="BlueLightGradientBrush" StartPoint="0,0" EndPoint="0,1">
<GradientStop Offset="0" Color="#FFEAF3FF"/>
<GradientStop Offset="0.654" Color="#FFC0DEFF"/>
<GradientStop Offset="1" Color="#FFC0D9FB"/>
</LinearGradientBrush>
<!-- DatGrid style -->
<Style TargetType="{x:Type dg:DataGrid}">
<Setter Property="Margin" Value="5" />
<Setter Property="Background" Value="{StaticResource BlueLightGradientBrush}" />
<Setter Property="BorderBrush" Value="#FFA6CCF2" />
<Setter Property="RowBackground" Value="White" />
<Setter Property="AlternatingRowBackground" Value="#FDFFD0" />
<Setter Property="HorizontalGridLinesBrush" Value="Transparent" />
<Setter Property="VerticalGridLinesBrush" Value="#FFD3D0" />
<Setter Property="RowHeaderWidth" Value="0" />
</Style>
<!-- Enable rows as drop targets -->
<Style TargetType="{x:Type dg:DataGridRow}">
<Setter Property="AllowDrop" Value="True" />
</Style>
</ResourceDictionary>
</Window.Resources>
<dg:DataGrid DataContext="{Binding MainViewModel}" ItemsSource="{Binding CashAccounts}">
Margin="5" AutoGenerateColumns="True" HorizontalScrollBarVisibility="False">
<dg:DataGrid.Columns>
<dg:DataGridTextColumn Binding="{Binding account}" Header="Account Code" />
<dg:DataGridTextColumn Binding="{Binding name}" Header="Security Name" />
<dg:DataGridTextColumn Binding="{Binding cashAmount}" Header="Quantity Start of Day" />
<dg:DataGridTextColumn Binding="{Binding price}" Header="Cash Delta (Price Delta)" />
<dg:DataGridTemplateColumn Header="Action">
<dg:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Button Content="Get" Visibility="{Binding cashChanged, Converter={StaticResource VisibilityConverter}}" Background="Red" />
</DataTemplate>
</dg:DataGridTemplateColumn.CellTemplate>
</dg:DataGridTemplateColumn>
</dg:DataGrid.Columns>
</dg:DataGrid>

Answer 1

When you do DataContext="{Binding Path=Main, Source={StaticResource Locator}}" in your Window and after DataContext="{Binding MainViewModel}" in the Datagrid, WPF tries to bind to a property named MainViewModel on your MainViewModel class which will fail. You can confirm this by looking for the binding error in the Output window in VS.
Just remove DataContext="{Binding MainViewModel}" from the DataGrid and it should work.
EDIT:
There is an extra closing > at the end of the first line in your XAML:
<dg:DataGrid DataContext="{Binding MainViewModel}" ItemsSource="{Binding CashAccounts}">
Margin="5" AutoGenerateColumns="True" HorizontalScrollBarVisibility="False">
It should be:
<dg:DataGrid DataContext="{Binding MainViewModel}" ItemsSource="{Binding CashAccounts}"
Margin="5" AutoGenerateColumns="True" HorizontalScrollBarVisibility="Disabled">
Note: False is not a valid value for HorizontalScrollBarVisibility it supports Auto, Disabled, Hidden, Visible
But I don't know why WPF throws Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead for your original XAML instead of some more meaningful error.