I'm wondering how the filters in RadGridView work. How do they check for equality?

After some experimentation it seems that they check for "referential equality" (is that what is it called??), that is the filter checks if the rows have exactly the same object as the filter. So even if a column shows a custom type of mine and I have implemented the Equals() method, it won't matter.

Lets say I have a custom type representing a customer:

I'm using MVVM and each row displayed in the gridview has a viewmodel. This viewmodel has the following code:

The row-viewmodel has a property called "Contact" that is of my custom type. It also has a BindingList of the same type that will contain all available contact/customers.

And in my XAML I have this code:

As you can see the column that shows the contact binds to the property Contact on the row-viewmodel. In the cell edit template there's a ComboBox that allows the user to choose one contact from the list with all contacts.

"MyData" that the gridview is bound to is a QueryableCollectionView that has all the rows (row-viewmodels) that are to be displayed. It is created something like this:

All this works fine.

Now I want to apply filtering on that column by code. Let's say that there are ten available customers. If I open the filter popup on the gridview all ten are displayed in the list of checkboxes where you can specify which ones to show. These are the "distict filters". To apply distinct filters in code behind I would do something like this:

When I run this I see that a filter is applied, but all my rows are removed by the filter, even those that has Id=1 and Name=David.

I have tried a different model where I don't create a new Customer and put in the Value of the filter but instead put an instance of Customer that is actually in the list AllCustomers. When I do this it works fine. The filter removes all rows except those who has that specific customer (David) as customer. This leads me to think that the filter checks equality by checking "referential equality" and does not use the Equals method.

Am I right in this assumption or is it something else I'm missing?

GridView in WPF Q1 2011 throws a Null Pointer Exception when trying to deselect a previously selected row.

I've tried:

DocumentGrid.UnselectAll()

DocumentGrid.SelectedItems.Clear()

DocumentGrid.SelectedItem = Nothing

All trigger the exception as does Grouping when a row is selected.

The problem only occurs when using an IEnumerable as an ItemsSource.  Changing this to mysource.ToList() fixes the problem.

Hi,

I am trying to style a RadChart. It is a bargraph (set from code) and I want to change the default colors of the bars. So I used the RadChart.PaletteBrushes and defined SolidBrush colors(Found this method in the following link : http://www.telerik.com/help/wpf/radchart-styling-and-appearance-styling-chart-series.html) as follows:

<telerik:RadChart Background="Transparent" HorizontalContentAlignment="Center" HorizontalAlignment="center"> 
       <telerik:RadChart.PaletteBrushes> 
                <SolidColorBrush Color="#FF0B3F74"/>  
                <SolidColorBrush Color="#FF721111"/>  
                <SolidColorBrush Color="#FFA1720B"/>  
      </telerik:RadChart.PaletteBrushes> 
</telerik:RadChart>

But now, an exception as follows occurs while running the application :

'System.Windows.Media.SolidColorBrush' must have IsFrozen set to false to modify.

This exception occurs randomly. Also, in the stack trace, there is a mention of RadTransition Control too. Why could this error be occuring? How can it be solved?