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

look to this link

https://learn.microsoft.com/en-us/visualstudio/data-tools/walkthrough-creating-a-simple-wcf-service-in-windows-forms?view=vs-2022&tabs=csharp

Answer 2

toolbox --> choose items

private void button1_Click(object sender, EventArgs e)
{
// Create object of Open file dialog class
{
OpenFileDialog dlg = new OpenFileDialog();
// set file filter of dialog
dlg.Filter = "pdf files (.pdf) |.pdf;";
dlg.ShowDialog();
if (dlg.FileName != null)
{
// use the LoadFile(ByVal fileName As String) function for open the pdf in control
axAcroPDF1.LoadFile(dlg.FileName);
}
}
}

Answer 3

wcf:

public DataSet GetData(int value)
{
DataSet dataSet = new DataSet();
dataSet.ReadXml(@"C:\Users\matga\source\repos\Testtest\WCF_Service\WCF_Service\data.xml");
return dataSet;
}

wpf:

ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
public MainWindow()
{
InitializeComponent();

		dgv.ItemsSource = client.GetData(1).Tables["CD"].DefaultView;  
		label.Content = client.GetData(1).Tables.Count;  
	}

Answer 4

WCF:

public class Service1 : IService1
{
private ManageXML manageXML = new ManageXML();
public DataSet GetData()
{
return manageXML.MyDataSet;
}

	public void UpdateData(DataSet ds)  
	{  
		manageXML.UpdateXML(ds);  
	}  
}  

public class ManageXML  
{  
	private string path = @"C:\Users\matga\source\repos\Testtest\WCF_Service\WCF_Service\data.xml";  
	public DataSet MyDataSet { get; set; } = new DataSet();  

	public ManageXML()  
	{  
		MyDataSet.ReadXml(path);  
	}  

	public void UpdateXML(DataSet ds)  
	{  
		MyDataSet = ds;  
		MyDataSet.WriteXml(path);  
	}  
}  

WCF Interface:

[ServiceContract]
public interface IService1
{

	[OperationContract]  
	DataSet GetData();  

	[OperationContract]  
	void UpdateData(DataSet ds);  
}  

WPF:

ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
public MainWindow()
{
InitializeComponent();

		dgv.ItemsSource = client.GetData(1).Tables["CD"].DefaultView;  
		label.Content = client.GetData(1).Tables.Count;  
	}  

// "CD" change to your Table

Answer 5

private void update_Click(object sender, RoutedEventArgs e)
{
DataTable dt = DataGridtoDataTable(dgv);

        DataSet ds = new DataSet("Catalog");  
		ds.Tables.Add(dt);  
		client.UpdateData(ds);  
	}  

    public DataTable DataGridtoDataTable(DataGrid dg)  
    {  
        dg.SelectAllCells();  
        dg.ClipboardCopyMode = DataGridClipboardCopyMode.IncludeHeader;  
        ApplicationCommands.Copy.Execute(null, dg);  
        dg.UnselectAllCells();  
        String result = (string)Clipboard.GetData(DataFormats.CommaSeparatedValue);  
        string[] Lines = result.Split(new string[] { "\r\n", "\n" },  
        StringSplitOptions.None);  
        string[] Fields;  
        Fields = Lines[0].Split(new char[] { ',' });  
        int Cols = Fields.GetLength(0);  
        DataTable dt = new DataTable("CD");  
        //1st row must be column names; force lower case to ensure matching later on.  
        for (int i = 0; i < Cols; i++)  
            dt.Columns.Add(Fields[i].ToUpper(), typeof(string));  
        DataRow Row;  
        for (int i = 1; i < Lines.GetLength(0) - 1; i++)  
        {  
            Fields = Lines[i].Split(new char[] { ',' });  
            Row = dt.NewRow();  
            for (int f = 0; f < Cols; f++)  
            {  
                Row[f] = Fields[f];  
            }  
            dt.Rows.Add(Row);  
        }  
        return dt;  

    }