如何在数据网格中显示外键数据

Question

I am using Entity Framework 6 with a code first approach. The code below is simplified version of the entity classes I'm working with.

public class Complaint
{
    public int ComplaintId { get; set; }
    public int RemarkId { get; set; }
    public string ComplaintName { get; set; }

    public virtual Remark RemarkNavigation { get; set; }
}

public class Remark
{
    public int RemarkId { get; set; }
    public string RemarkText { get; set; }

    public virtual ICollection<Complaint> ComplaintsReverseNavigation { get; set; }
}

Next I'll query the database with Linq.

var complaints = db.Complaints
    .Where(x => x.ComplaintId == 1)
    .DefaultIfEmpty()
    .ToList();

Then I'll use the extension method ToBindingList() in order to track any changes made. Like so...

var complaintsBindingList = db.Complaints.Local.ToBindingList();

Finally I'll display the data in a data grid. Unfortunately any foreign key data will not be displayed correctly as seen in this picture.

How then can I display the RemarkText from the RemarkNavigation in the data grid?

Answer 1

I figured out how to display my data. I turned AutoGenerateColumns to false. Then I explicitly created the column like so.

<DataGrid ItemsSource="{Binding DataSource}">
    <DataGrid.Columns>
        <DataGridTextColumn Header="TestColumn" Binding="{Binding RemarkNavigation.RemarkText}"/>
    </DataGrid.Columns>
</DataGrid>

From the looks of it AutoGenerateColumns won't generate values that are multiple levels down.