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C # WPF - How to always get the current text from a textbox?

I have a TextBox in FileWindow.xaml:

<TextBox x:Name="textBox" HorizontalAlignment="Left" Height="23" Margin="233,230,0,0" TextWrapping="Wrap" Text="{Binding FileName}" VerticalAlignment="Top" Width="120"/>

In ViewModel.cs:

public String FileName
{
    get { return _model.filename; }
    set
    {
        if (value != _model.filename)
        {
            _model.filename = value;
            OnPropertyChanged();
        }
    }
}

In Model.cs:

private String _filename = "example.txt";
public String filename { get { return _filename; } set { _filename = value; } }

I want that every time I enter text in the TextBox the _filename in Model.cs is updated.
The default text in the TextBox is example.txt, but if I change it, the filename in Model.cs doesn't change. What am I doing wrong?

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2 answers


Try setting the UpdateSourceTrigger

binding property to PropertyChanged

:



Text="{Binding FileName, UpdateSourceTrigger=PropertyChanged}"
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The TextBox was not immediately posted back to original code. Instead, the source was only updated after focus was lost in the TextBox. This behavior is controlled by a property on a named binding UpdateSourceTrigger

.

The default is Default, which basically means that the source is updated based on the property you are binding to.



The default is the UpdateSourceTrigger

default. Other options: PropertyChanged

, LostFocus

and Explicit

.

 <TextBox Text="{Binding FileName, UpdateSourceTrigger=PropertyChanged}" />
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