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Hide/Show GridViewDataColumn with databinding

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LE DREAU Steeve
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LE DREAU Steeve asked on 08 Feb 2010, 09:57 AM
Hi,

I'm trying to bind a boolean value to the IsVisible property of a GridViewDataColumn to show/hide a column through MVVM pattern.
I have a viewmodel with a "ShowNameColumn" boolean property. When I set this property, I raise a onpropertychanged event to tell the view to refresh the property value.
This property is bound to IsVisible property of my gridviewcolumn like this :
<telerikGridView:GridViewDataColumn Width="5*" IsVisible={Binding ShowNameColumn} DataMemberBinding="{Binding Name}" Header="Name" /> 

But I have an exception when running this :
AG_E_PARSER_BAD_PROPERTY_VALUE [Line: 27 Position: 74]

So my first question is :
When you uyse databindings on gridviewDataColumn, DataMemberBinding will try to get the value from the current bound item that gridview is working on, but is I use binding on other properties like IsVisible, does your gridview get the value from the datacontext of the view or from the item the gridview is parsing ?

My second question :
How can I Show/Hide a column through binding ?

Thanks,

Regards,
Steeve

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Vlad
Telerik team
answered on 08 Feb 2010, 10:07 AM
Hello Steeve,

You cannot bind column properties since Binding in Silverlight 3 is supported only for FrameworkElement – grid columns are plain DependencyObjects.

Sincerely yours,
Vlad
the Telerik team

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LE DREAU Steeve
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answered on 08 Feb 2010, 10:59 AM
Thanks for your quick answer Vlad.
Bye
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Dimitrina P
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answered on 11 Apr 2011, 02:29 PM
Now, with Silverlight 4 it is possible to show/hide GridViewDataColumn with databinding. 
You should define your property in your view model
public class EmployeeHolder : INotifyPropertyChanged
    {
        bool _isVisible = false;
        public bool IsVisible
        {
            get { return _isVisible; }
            set
            {
                _isVisible = value;
                RaisePropertyChanged("IsVisible");
            }
        }
 
        public List<Employee> Employees
        {
            get
            {
                List<Employee> employees = new List<Employee>();
                employees.Add(new Employee() { EmployeeFirstName = "Name1" });
                employees.Add(new Employee() { EmployeeFirstName = "Name2" });
                return employees;
            }
        }
}
public class Employee
{
    public string EmployeeFirstName { get; set; }
}

After that you need to bind the IsVisible property of the column:
<CheckBox IsChecked="{Binding IsVisible, Mode=TwoWay}" Content="Is Visible" Margin="3"/>
<telerik:RadGridView ItemsSource="{Binding Employees}" AutoGenerateColumns="False">
    <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn UniqueName="FirstName" Header="First Name" DataMemberBinding="{Binding EmployeeFirstName}"
                                    IsVisible="{Binding IsVisible, Source={StaticResource EmployeeHolder}}"/>
    </telerik:RadGridView.Columns>
</telerik:RadGridView>

Kind Regards,
Didie
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Brian
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answered on 17 May 2011, 07:48 PM
In your example, you are binding whether to show a column based on a property for the entire row.  What if I want to hide 2 columns but show two others?  This method won't work in that case. 

I'm trying to bind the IsVisible property of a GridViewDataColumn to a property in the supporting view model.  The view model contains the ItemsSource for the RadGridView.  This is not working and I get no binding error of any kind.  Should this work?

<telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}" IsVisible="{Binding ElementName=dgTestData, Path=DataContext.ShowLastNameColumn, Mode=TwoWay}">
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LE DREAU Steeve
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Vlad
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LE DREAU Steeve
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Dimitrina P
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Brian
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