Databinding to a method in WPF

Question

I am having trouble databinding a TextBox.Text property to a object\'s method. The idea is allowing the user to write in a TextBox a file name and then

Answer 1

Databinding requires the NotifyPropertyChanged event to be called when the source is updated. In this case, you'd want to wrap this function call in a get/set like so:

public class FileWrapper: System.ComponentModel.INotifyPropertyChanged{
    private string m_filename;

    public string FileExtension{
        get{ return GetFileExtension(FileName);}
    }

    public string FileName{
        get{ return m_filename;}
        set{ m_filename = value; OnPropertyChanged("FileName"); OnPropertyChanged( "FileExtension");
    }

    public string GetFileExtension( string filename){
        //implementation
    }

    public event System.ComponentModel.NotifyPropertyChangedEvent PropertyChanged = (a,b)=>{};

    protected void OnPropertyChanged(string property){
        PropertyChanged( this, new System.ComponentModel.PropertyChangedEventArgs( property ));
    }
}