CODEWITHSUNDEEP
wpfxamldata-binding
hellzone
hellzone

Reputation: 5246

WPF simple databinding

i want to bind textbox But it isn't display the string. Second thing is i want to update Name string periodically. Any solution?

here is my c# code:

public partial class Window1 : Window
{
  public String Name = "text";
}

xaml code:

<Grid Name="myGrid" Height="300">
  <TextBox Text="{Binding Path=Name}"/>
</Grid>

Upvotes: 0

Views: 177

Answers (4)

yo chauhan
yo chauhan

Reputation: 12315

public partial class MainWindow : Window,INotifyPropertyChanged
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;
    }
    private string _name;
    public string Name
    {
        get
        {
            return _name;
        }
        set
        {
            _name = value;
            NotifyCahnge("Name");

        }

    }

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

    public event PropertyChangedEventHandler PropertyChanged;
}

Hope this will help

Upvotes: 3

MBen
MBen

Reputation: 3996

You need to delcare Properties not field, what you have delcared here is a field.

public String Name {get; set;}

Plus it should not be in the Control file (UI file). Move it to separate class and set it as a DataContext.

PLus as Vlad pointed you need to Notify to UI that things changes, simple proprties doesn't have that.

Nice article on dataBinding :

Upvotes: 2

Vlad
Vlad

Reputation: 35594

You need to define your Name as a DependencyProperty:

public string Name
{
    get { return (string)GetValue(NameProperty); }
    set { SetValue(NameProperty, value); }
}

public static readonly DependencyProperty NameProperty = 
    DependencyProperty.Register("Name", typeof(string), typeof(Window1));

(Note that Visual Studio defines a handy snippet propdp for this, try typing propdp + TAB + TAB.)

Then, you need to bind correctly. Something like that:

<TextBox Text="{Binding Name, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}"/>

Upvotes: 1

Eli Arbel
Eli Arbel

Reputation: 22747

WPF bindings work with properties, not fields. You need to define Name as a property, and also set the Window's data context:

public partial class Window1 : Window
{
  public String Name { get; set; }

  public Window1()
  {
      Name = "text";
      DataContext = this;

      InitializeComponent();
  }
}

You can also define it as a Dependency Property if you want to support change notification and other DP-related features or use INotifyPropertyChanged. I suggest you read more about WPF data binding here.

Upvotes: 1

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