Hi Stefana,

Thanks for your example !

I was going through my code and found out that it was different from the example u had mentioned.

In my case only after the views are created( i.e, after the InitializeComponent() ) the viewmodel is assigned as the datacontext of the view !!

Hence only after the window is loaded the datacontext is available !! The problem is that i can't change the code which is already present before!

Is there a way to use the datacontext available, after the window is loaded, to change the visibility of the field in the datagrid ??

Regards,

Jai

Hello Jai,

I am just checking the progress of this issue and was wondering if you managed to achieve your goal or if you need any further assistance on the matter.

If the above suggestion helped you solve your issue please verify the thread as answered so other users may take better advantage of it.

I am having a similar issue except with a combobox instead of a checkbox.

Any help greatly appreciated.

Here is my code:

MainWindow.xaml

<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:igDP="http://infragistics.com/DataPresenter"
xmlns:wpfApplication1="clr-namespace:WpfApplication1"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<wpfApplication1:Value1VisibilityConverter x:Key="Value1VisibilityConverter" />
<wpfApplication1:Value2VisibilityConverter x:Key="Value2VisibilityConverter" />
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" Grid.Row="0" Margin="10 0 0 10" >
<TextBlock VerticalAlignment="Center">Which Value?</TextBlock>
<ComboBox Width="80" Margin="10 0 0 0" SelectedIndex="{Binding SelectedIndex, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
<ComboBoxItem>Value 1</ComboBoxItem>
<ComboBoxItem>Value 2</ComboBoxItem>
</ComboBox>
</StackPanel>
<igDP:XamDataGrid VerticalAlignment="Top"
Grid.Row="1"
AutoFit="True"
GroupByAreaLocation="None"
Theme="Office2013"
DataSource="{Binding GridValues}">
<igDP:XamDataGrid.FieldLayoutSettings>
<igDP:FieldLayoutSettings AutoGenerateFields="False"/>
</igDP:XamDataGrid.FieldLayoutSettings>
<igDP:XamDataGrid.FieldLayouts>
<igDP:FieldLayout>
<igDP:UnboundField Label="Product" Binding="{Binding ProductName}"/>
<igDP:UnboundField Label="Value1" Width="100" Binding="{Binding Value1, Mode=TwoWay}" Visibility="{Binding SelectedIndex, Converter={StaticResource Value1VisibilityConverter}, UpdateSourceTrigger=PropertyChanged}"/>
<igDP:UnboundField Label="Value2" Width="100" Binding="{Binding Value2, Mode=TwoWay}" Visibility="{Binding SelectedIndex, Converter={StaticResource Value2VisibilityConverter}, UpdateSourceTrigger=PropertyChanged}"/>
</igDP:FieldLayout>
</igDP:XamDataGrid.FieldLayouts>
</igDP:XamDataGrid>
</Grid>
</Window>

MainWindow.xaml.cs

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Globalization;
using System.Windows;
using System.Windows.Data;

namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
MyVM vm = new MyVM();
this.DataContext = vm;

vm.GridValues = new ObservableCollection<GridRow>();
vm.GridValues.Add(new GridRow() { ProductName = "Product 1", Value1 = 1, Value2 = 0 });
vm.GridValues.Add(new GridRow() { ProductName = "Product 2", Value1 = 1, Value2 = 0 });
vm.GridValues.Add(new GridRow() { ProductName = "Product 3", Value1 = 1, Value2 = 0 });
vm.GridValues.Add(new GridRow() { ProductName = "Product 4", Value1 = 1, Value2 = 0 });
vm.GridValues.Add(new GridRow() { ProductName = "Product 5", Value1 = 1, Value2 = 0 });
vm.RaisePropertyChanged("GridValues");
}
}

public class ViewModelBase : INotifyPropertyChanged
{
public void RaisePropertyChanged(String property)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(property));
}

public event PropertyChangedEventHandler PropertyChanged = null;
}

public class MyVM : ViewModelBase
{
private int _selectedIndex;

public int SelectedIndex
{
get { return _selectedIndex; }
set
{
_selectedIndex = value;
this.RaisePropertyChanged("SelectedIndex");
}
}

public ObservableCollection<GridRow> GridValues { get; set; }
}

public class GridRow : ViewModelBase
{
public String ProductName { get; set; }
public Double Value1 { get; set; }
public Double Value2 { get; set; }
}

internal class Value1VisibilityConverter : IValueConverter
{
#region IValueConverter Members
public Object Convert(Object value, Type targetType, Object parameter, CultureInfo culture)
{
return ((int)value) == 0 ? "Visible" : "Collapsed";
}

public Object ConvertBack(Object value, Type targetType, Object parameter, CultureInfo culture)
{
return value;
}
#endregion
}

internal class Value2VisibilityConverter : IValueConverter
{
#region IValueConverter Members
public Object Convert(Object value, Type targetType, Object parameter, CultureInfo culture)
{
return ((int)value) == 1 ? "Visible" : "Collapsed";
}

public Object ConvertBack(Object value, Type targetType, Object parameter, CultureInfo culture)
{
return value;
}
#endregion
}
}

Hello Jon,

Thank you for your post. I have been looking into it and I created a sample project for you using your code with a modification in the Bindings. Basically I create an instance of the ViewModel in the Windows’ resources and set it as DataContect to the Grid. I also use it as Source of the Field’s Bindings, because the Fields are not visual elements and they are not part of the VisualTree and they doesn’t inherit the DataContext. Please let me know if this helps you or you have further questions on this matter.

Looking forward for your reply.

Is there a way to do this using RelativeSource?  I was hoping not to have to change the way I bind the view to the viewmodel.

Hello Jon,

As I said the Field element is not a visual element, so it doesn't belong to the VisualTree and it doesn't inherit the DataContext. This is why the Source Property of the Binding should be set.