DataGrid加载/保存XML

Question

I have a rather straightforward question.

How to I get a DataGrid in WPF to save/load raw XML files and have the ability to display/edit them with other controls? The application will only work offline so I won't need SQL. Just simply open, edit and save data to XML.

My previous projects with WinForms involved creating a DataSet (xsd file) and a DataTable, bound it to a DataGridView. Then add new items with by calling "AddDataTableRow()". Save/Read XML files by "ReadXML", "WriteXML".

I'm kinda new to WPF so any help would be very appreciated.

Answer 1

A very straightforward approach would be to simply define a data collection class (an ObservableCollection containing instances of a data class which implements INotifyPropertyChanged), mark these classes as serializable and use XmlSerializer for serializing/deserializing.

A sample data class:

[Serializable]
public class Person : INotifyPropertyChanged
{
    private string firstName;
    private string lastName;

    public event PropertyChangedEventHandler PropertyChanged;

    public string FirstName
    {
        get { return firstName; }
        set
        {
            firstName = value;
            NotifyPropertyChanged("FirstName");
        }
    }

    public string LastName
    {
        get { return lastName; }
        set
        {
            lastName = value;
            NotifyPropertyChanged("LastName");
        }
    }

    private void NotifyPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

and the data collection class:

[Serializable]
public class PersonCollection : ObservableCollection<Person>
{
}

Some XAML:

<Window x:Class="DataGrid.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:DataGridTest"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:PersonCollection x:Key="PersonCollection"/>
        <CollectionViewSource x:Key="PersonCollectionViewSource" Source="{StaticResource PersonCollection}"/>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <DataGrid Name="dataGrid" Margin="2" ItemsSource="{Binding Source={StaticResource PersonCollectionViewSource}}"/>
        <StackPanel Grid.Row="1" Margin="2" Orientation="Horizontal" HorizontalAlignment="Right">
            <Button Content="Save" Click="Button_Click"/>
        </StackPanel>
    </Grid>
</Window>

And class MainWindow with the deseralization code in the constructor and the serialization code in the button click handler:

public partial class MainWindow : Window
{
    private PersonCollection persons;

    public MainWindow()
    {
        InitializeComponent();

        persons = (PersonCollection)Resources["PersonCollection"];

        XmlSerializer serializer = new XmlSerializer(typeof(PersonCollection));

        using (FileStream stream = new FileStream("Persons.xml", FileMode.Open))
        {
            IEnumerable<Person> personData = (IEnumerable<Person>)serializer.Deserialize(stream);

            foreach (Person p in personData)
            {
                persons.Add(p);
            }
        }
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        XmlSerializer serializer = new XmlSerializer(typeof(PersonCollection));

        using (FileStream stream = new FileStream("Persons.xml", FileMode.Create))
        {
            serializer.Serialize(stream, persons);
        }
    }
}

Answer 2

Use Linq and XElement instead of an Xdocument and data sets.

http://msdn.microsoft.com/en-us/library/bb669141.aspx