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IService1.cs

// ADO.Net Datenbank verbunden

namespace Wetter_WCF
{
[ServiceContract]
public interface IService1
{
[OperationContract]
List<WeatherDataDTO> GetWeatherData(RangeFilter rangeFilter);
}

[DataContract]  
public class RangeFilter  
{  
    [DataMember]  
    public string From { get; set; }  
    [DataMember]  
    public string To { get; set; }  
    public RangeFilter() { }  
    public RangeFilter(string from, string to)  
    {  
        this.From = from;  
        this.To = to;  
    }  
}  

[DataContract]  
public class WeatherDataDTO  
{  
    [DataMember]  
    public int Id { get; set; }  
    [DataMember]  
    public string Date { get; set; }  
    [DataMember]  
    public string Time { get; set; }  
    [DataMember]  
    public double Temperature { get; set; }  
    [DataMember]  
    public int Pressure { get; set; }  
    [DataMember]  
    public int Rain { get; set; }  
    [DataMember]  
    public double Wind { get; set; }  
    [DataMember]  
    public int Direction { get; set; }  
    [DataMember]  
    public int Humidity { get; set; }  
}  

}

Service1.svc.cs

namespace Wetter_WCF
{
public class Service1 : IService1
{

    private WeatherDataEntities context = new WeatherDataEntities();  
      
    public List<WeatherDataDTO> GetWeatherData(RangeFilter rangeFilter)  
    {  
        List<WeatherDataDTO> weatherDataDTOs = new List<WeatherDataDTO>();  

        var start = parseDateTime(rangeFilter.From);  
        var end = parseDateTime(rangeFilter.To);  

        var query =  
            from weatherData in context.WeatherData  
            where weatherData.Datum >= start && weatherData.Datum <= end  
            select weatherData;  

        var i = 0;  

        foreach(var weatherData in query)  
        {  
            weatherDataDTOs.Add(new WeatherDataDTO  
            {  
                Id = weatherData.Id,  
                Date = weatherData.Datum.ToString(),  
                Direction = weatherData.Richtung.Value,  
                Humidity = weatherData.Feuchtigkeit.Value,  
                Pressure = weatherData.Luftdruck.Value,  
                Rain = weatherData.Regen.Value,  
                Temperature = weatherData.Temperatur.Value,  
                Time = weatherData.Zeit.Value.ToString(),  
                Wind = weatherData.Wind.Value  
            });  

            if (i == 200)  
            {  
                break;  
            }  

            i++;  
        }  

        return weatherDataDTOs;  
    }  
      
    private DateTime parseDateTime(string dateTime)  
    {  
        return DateTime.Parse(dateTime);  
    }  
}  

}

Wetter_WPF
MainWindow.xaml

<Grid>  
    <DataGrid x:Name="grid" HorizontalAlignment="Left" Height="288" Margin="10,121,0,0" VerticalAlignment="Top" Width="772" AutoGenerateColumns="False">  

        <DataGrid.Columns>  
            <DataGridTextColumn Binding="{Binding Id}" ClipboardContentBinding="{x:Null}" Header="Id"/>  
            <DataGridTextColumn Binding="{Binding Date}" ClipboardContentBinding="{x:Null}" Header="Date"/>  
            <DataGridTextColumn Binding="{Binding Time}" ClipboardContentBinding="{x:Null}" Header="Time"/>  
            <DataGridTextColumn Binding="{Binding Temperature}" ClipboardContentBinding="{x:Null}" Header="Temperature"/>  
            <DataGridTextColumn Binding="{Binding Pressure}" ClipboardContentBinding="{x:Null}" Header="Pressure"/>  
            <DataGridTextColumn Binding="{Binding Rain}" ClipboardContentBinding="{x:Null}" Header="Rain"/>  
            <DataGridTextColumn Binding="{Binding Wind}" ClipboardContentBinding="{x:Null}" Header="Wind"/>  
            <DataGridTextColumn Binding="{Binding Direction}" ClipboardContentBinding="{x:Null}" Header="Direction"/>  
            <DataGridTextColumn Binding="{Binding Humidity}" ClipboardContentBinding="{x:Null}" Header="Humidity"/>  
        </DataGrid.Columns>  

    </DataGrid>  

    <Label Content="FROM:" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top"/>  
    <DatePicker x:Name="fromPicker" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="58,11,0,0"/>  
    <Label Content="TO:" HorizontalAlignment="Left" Margin="28,41,0,0" VerticalAlignment="Top"/>  
    <DatePicker x:Name="toPicker" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="58,40,0,0"/>  
    <Button Content="Search" HorizontalAlignment="Left" Margin="10,72,0,0" VerticalAlignment="Top" Width="75" Click="Search_Button_Click"/>  

</Grid>  

MainWindow.xaml.cs

// ServiceReference holen -> Programm zuerst ausführen!!!
namespace Wetter_WPF {
public partial class MainWindow : Window {

    private ServiceReference1.IService1 client = new ServiceReference1.Service1Client();  

    public MainWindow() {  
        InitializeComponent();  
        init();  
    }  

    public void init() {  
        this.fromPicker.SelectedDate = new DateTime(2013, 1, 1);  
        this.toPicker.SelectedDate = new DateTime(2013, 1, 1);  
    }  

    public void update(){  
        var from = fromPicker.SelectedDate.ToString().Split(' ')[0];  
        var to = toPicker.SelectedDate.ToString().Split(' ')[0];  

        var filter = new RangeFilter {  
             From = from,  
             To = to  
         };  

        var data = this.client.GetWeatherData(filter);  
        this.grid.ItemsSource = data;  
    }  

    private void Search_Button_Click(object sender, RoutedEventArgs e) {  
        update();  
    }  
}  

}