CODEWITHSUNDEEP
c#data-binding
user12991669
user12991669

Reputation:

Binding elements to values in WPF

I'm trying to bind a Textbox to a string defined in the .cs file using the followings:

Xaml Code:

<TextBox x:Name="textBox_Data" CaretBrush="DodgerBlue" Foreground="White" Text="{Binding Data}" HorizontalAlignment="Left" Height="22" Margin="10,10,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="123" SelectionChanged="textBox_Data_SelectionChanged"/>

Xaml.cs Code:

public string Data{get; set;}

But the string isn't updating...

Upvotes: 0

Views: 37

Answers (2)

dovid
dovid

Reputation: 6452

{Binding Data} refer the DataContext of current element (or to one of ancestors).

one way

for refer the xaml.xxx.cs you need refer the Window element, you can give him a name:

<Window x:Name="window" x:Class=...

and change the Binding to refer element name:

Text="{Binding Data, ElementName=window}"

Second way

you can also inject all window class to current DataContext:

<Window DataContext="{Binding RelativeSource={RelativeSource Self}}" x:Class=...

Now you can leave the original expression:

Text="{Binding Data}"

Third way

You can also set DataContext from the code. do not change anything in xaml, and add in this line (DataContext = this;) at end of constructor:

 public xyz() {

     InitializeComponent();
     //...
     DataContext = this;
 }

Upvotes: 0

Tom&#225;š Filip
Tom&#225;š Filip

Reputation: 817

Your class has to derive from INotifyPropertyChanged and you have to implement it in your property setter

Or more pleasant way: Install PropertyChanged.Fody from nuget. You can read more about it here: https://github.com/Fody/PropertyChanged

And keep in mind, not to use this.DataContext=this; when initializing your window, use binding as dovid suggests.

Upvotes: 1

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