Question

I have a data grid which ItemsSource is binded to the result of LINQ to Entity query and in one column are EntityCollection objects.

   private void DataGridRecipientsLoad()
    {
        dataGridRecipients.ItemsSource = from rec in _recipientService.GetAllRecipients()
                                         select rec;
        dataGridRecipients.Columns[7].Visibility = System.Windows.Visibility.Collapsed;
        dataGridRecipients.Columns[8].Visibility = System.Windows.Visibility.Collapsed;            
    }

How can I create a template in C# that takes out just string properties out of the items in Entity Collection and displays them? Right now the cells are empty.

The EntityCollection consists entities called MailingList and I want to display myMailingList.Name of each of them.

Answer 1

For example, you have collection of customers and of them has the next properties: FirstName and LastName:

internal class Customer
{
    public string FirstName {get; set;}
    public string LastName {get;set;}
}

then you can simple grid view for it:

<DataGrid x:Name="CustomersGridView" AutoGenerateColumns="False" >
        <DataGrid.Columns>
            <DataGridTextColumn Header="First Name" Binding="{Binding Path=FirstName}" />
            <DataGridTextColumn Header="Last Name" Binding="{Binding Path=LastName}" />
        </DataGrid.Columns>
    </DataGrid>

And you also need to assign ItemSource (as you did in you code).
You can also write more flexible templates for your need using DataGridTemplateColumn.
I suggest you read more about xaml templates. (this link/another link has nice samples).
p.s.Also when i see such questions i allways suggest to read about MVVM.