Question

I have a wpf-mvvm application. I have one textbox and one button (similar to FileUpload control). How can I display all folders under a given folder ..when user type it.

I mean similar to..when windows display all folders under c drive..when we type c:\ in start->RUN.

Answer 1

This is a broad question so I will give you an outline of a possible solution.

Each time the text in the TextBox changes you would check whether that is a real folder on disk using Directory.Exists(). If it does exist you would call Directory.GetDirectories() to get a list of all the subfolders. Add those subfolders to an ObservableCollection<string> object and use an ItemsControl or ListBox of some kind to bind to the collection of subfolders.

How do you know when the text of the TextBox changes as the user types? There are two ways. First way is to bind to a property and use UpdateSourceTrigger="PropertyChanged" in the binding so that the property is set as the user types. A second way would be to handle the TextBox‘s TextChanged event.