Ich versuche, Daten in Datagrid zu sortieren, aber wenn ich auf die Überschrift der Spalte klicke, die mit dem Konverter verbunden ist, passiert nichts. Ich benutze MVVM-Muster. Beispiel ist unten beigefügt. Im Beispiel zeigt das Raster die Spalte (Typ), in der der Personentyp angezeigt wird. Daher verwende ich den Konverter (Klasse TypeValueConverter). Wenn ich diesen Konverter verwende, sortiert das Raster den Spaltentyp nicht.

<Window x:Class="GridSort.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:my="clr-namespace:GridSort"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DataGrid ItemsSource="{Binding People}" AutoGenerateColumns="False">
            <DataGrid.Resources>
                <my:TypeValueConverter x:Key="typeConverter" />
            </DataGrid.Resources>
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding FirstName}" Header="FirstName" />
                <DataGridTextColumn Binding="{Binding Surname}" Header="Surname" />
                <DataGridTextColumn Binding="{Binding Converter={StaticResource ResourceKey=typeConverter}}" Header="Type" />
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

public class ViewModel
{
    private ICollection<Person> people;
    public ICollection<Person> People
    {
        get
        {
            if (this.people == null)
            {
                this.people = new List<Person>();
                this.people.Add(new Student() { FirstName = "Charles", Surname = "Simons" });
                this.people.Add(new Student() { FirstName = "Jake", Surname = "Baron" });
                this.people.Add(new Teacher() { FirstName = "John", Surname = "Jackson" });
                this.people.Add(new Student() { FirstName = "Patricia", Surname = "Phillips" });
                this.people.Add(new Student() { FirstName = "Martin", Surname = "Weber" });
            }

            return this.people;
        }
    }
}

public class TypeValueConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value == null)
            {
                return DependencyProperty.UnsetValue;
            }

            return value.GetType().Name;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

public abstract class Person
    {
        public string FirstName
        {
            get;
            set;
        }

        public string Surname
        {
            get;
            set;
        }
    }

    public class Student : Person
    {
    }

    public class Teacher : Person
    {
    }