Databindings are not working

Question

I have made a small Project where I have a wcf service and an wpf app to look up weather data in between certain dates. At first, everything was fine, but when I used Databindings, the Datagrid stayed emty. Can someone help me?

//WCF interface:
public interface IService1
    {
        [OperationContract]
        List<WeatherDataContract> GetWeatherData(DateTime start, DateTime end);
    }

    [DataContract]
    public class WeatherDataContract
    {
        [DataMember]
        public int Id { get; set; }
        [DataMember]
        public DateTime Datum { get; set; }
        [DataMember]
        public TimeSpan Zeit { get; set; }
        [DataMember]
        public double Temperatur { get; set; }
        [DataMember]
        public int Luftdruck { get; set; }
        [DataMember]
        public int Regen { get; set; }
        [DataMember]
        public double Wind { get; set; }
        [DataMember]
        public int Richtung { get; set; }
        [DataMember]
        public int Feuchtigkeit { get; set; }
    }
//WCF service
WeatherDataEntities weatherDataEntities = new WeatherDataEntities();
        public List<WeatherDataContract> GetWeatherData(DateTime start, DateTime end)
        {

            return (from weather in weatherDataEntities.WeatherDatas
                    where weather.Datum <= end && weather.Datum >= start
                    select new WeatherDataContract
                    {
                        Id = weather.Id,
                        Datum = (DateTime)weather.Datum,
                        Zeit = (TimeSpan)weather.Zeit,
                        Temperatur = (double)weather.Temperatur,
                        Luftdruck = (int)weather.Luftdruck,
                        Regen = (int)weather.Regen,
                        Wind = (int)weather.Wind,
                        Richtung = (int)weather.Richtung,
                        Feuchtigkeit = (int)weather.Feuchtigkeit
                    }).Take(100).ToList();
        }
//XAML:
<DataGrid x:Name="weatherDataGrid" HorizontalAlignment="Left" Height="355" Margin="21,35,0,0" VerticalAlignment="Top" Width="742" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Id}"/>
            <DataGridTextColumn Binding="{Binding Datum}"/>
            <DataGridTextColumn Binding="{Binding Zeit}"/>
            <DataGridTextColumn Binding="{Binding Temperatur}"/>
            <DataGridTextColumn Binding="{Binding Luftdruck}"/>
            <DataGridTextColumn Binding="{Binding Regen}"/>
            <DataGridTextColumn Binding="{Binding Wind}"/>
            <DataGridTextColumn Binding="{Binding Richtung}"/>
            <DataGridTextColumn Binding="{Binding Feuchtigkeit}"/>
        </DataGrid.Columns>
    </DataGrid>
    <DatePicker SelectedDateChanged="Date_SelectedDateChanged" x:Name="fromDate" HorizontalAlignment="Left" Margin="75,10,0,0" VerticalAlignment="Top" Width="150"/>
    <DatePicker SelectedDateChanged="Date_SelectedDateChanged" x:Name="toDate" HorizontalAlignment="Left" Margin="287,9,0,0" VerticalAlignment="Top" Width="136"/>
    <Label Content="From" HorizontalAlignment="Left" Margin="33,8,0,0" VerticalAlignment="Top"/>
    <Label Content="To" HorizontalAlignment="Left" Margin="260,10,0,0" VerticalAlignment="Top"/>

//xaml.cs
ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();

        public List<ServiceReference1.WeatherDataContract> WeatherData
        {
            get
            {
                return client.GetWeatherData(fromDate.SelectedDate ?? DateTime.MinValue, toDate.SelectedDate ?? DateTime.MaxValue).ToList();
            }
        }

        public MainWindow()
        {
            InitializeComponent();
        }

        private void Date_SelectedDateChanged(object sender, SelectionChangedEventArgs e)
        {
            weatherDataGrid.ItemsSource = WeatherData;
        }
    }

Answer 1

ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
DataSet ds = new DataSet();

    public MainWindow()  
	{  
		InitializeComponent();  
		ds = client.GetData();  
        dgv.ItemsSource = ds.Tables["CD"].DefaultView;  
	}  

	private void refresh_Click(object sender, RoutedEventArgs e)  
	{  
        ds = client.GetData();  
        dgv.ItemsSource = ds.Tables["CD"].DefaultView;  
	}  

	private void update_Click(object sender, RoutedEventArgs e)  
	{  
		client.UpdateData(ds);  
	}  

  

Answer 2

XML to DataSet
https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/dataset-datatable-dataview/loading-a-dataset-from-xml

DataSet to XML
https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/dataset-datatable-dataview/writing-dataset-contents-as-xml-data