I found the problem.
Probably when I tried to create INotifyPropertyChanged I misclicked the intelisense hint, and it creaded a new empty class INotifyPropertyChanged. I overlooked this.
When I deleted this class, all started to work.
INotifyPropertyChanged doesnt work when updating data code behind
Hello,
I have such XAML:
<Grid>
<TextBox Header="AAAA" Width="120" Height="80" Text="{Binding Data, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox>
</Grid>
and such code behind:
public sealed partial class MainPage : Page, INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string data;
public string Data
{
get { return data; }
set
{
if (data != value && this.PropertyChanged != null)
{
data = value;
this.PropertyChanged(this, new PropertyChangedEventArgs("Data"));
}
else
data = value;
}
}
public MainPage()
{
this.InitializeComponent();
Data = "aaa";
}
}
This code sets Data property as "aaa", this property is binded to TextBox
In my opinion when I run the app, there in TextBox should be visible value "aaa", but the TextBox is empty.
What I am doing wrong?
2 answers
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-
BitSmithy 1,976 Reputation points
2022-06-02T13:39:21.243+00:00 -
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,861 Reputation points
2022-03-21T02:15:59.127+00:00 Hello,
Welcome to Microsoft Q&A!INotifyPropertyChanged doesnt work when updating data code behind
The problem is that you have not specific current DataContext when used
Binding
, For solving this problem you could specific currentDataContext
as this inMainPage
ctor.public MainPage() { this.InitializeComponent(); this.DataContext = this; Data = "aaa"; }
Or use x:Bind to replace Binding that could binding property in the code behind. For more detail please refer to Data binding in depth
Nico.
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