WPF DataGrid Row add in codebehind - wpf

Question

I am from VB.Net WinForms comming. Now I wanted to write a small app in WPF, listing some files in a datagridview. I used WPF's DataGrid, created some Columns. And then failed to add my rows.
Please, can you help me to select the right way to get my filenames, state-text and thumbnails added to the DataGrid Row?
In VB.Net WinForms I can add a row like this:
Datagridview1.Rows.add(Myvalue, "RowStateText", "Hello World", MyDate)
In WPF's DataGrid I can add
DataGrid1.Items.Add(New DataGridRow())
But how to fill my DataGridRow?
Private Sub AddFilesAndFolders(ByVal Base As IO.DirectoryInfo, ByRef dgv As DataGrid)
'For Each di As IO.DirectoryInfo In Base.GetDirectories
' Call AddFilesAndFolders(di, dgv)
'Next
Dim item As DataGridRow
For Each fi As IO.FileInfo In Base.GetFiles
item = New DataGridRow'<-- test 1 (row is added but empty)
Dim di As New MyFileInfo'<-- test 2 (my own class with public members, but how to add as row with declared columns?)
di.FileName = fi.FullName
di.FileDate = fi.LastAccessTime
item.Item = fi.FullName
dgv.Items.Add(di)
Next
End Sub

Answer 1

Hi: you should set an ItemsSource instead of adding items manually. If the columns are set up correctly then it will just 'work'!
dbv.ItemsSource = Base.GetFiles
or
dbv.ItemsSource = CreateMyFileInfos(Base.GetFiles)
If you have any more problems, please post back here.
Edit: on second inspection it looks like you may want to be doing it recursively. In which case your AddFilesAndFolders could instead be CreateFilesAndFolders, which would return a collection of FileInfo/MyFileInfo objects, merged with the collections produced by the child folders recursively; then bind the whole list returned from the first call, to the grid.
Hope that helps!

Answer 2

WPF is a mindset change, you need to get away from the Winforms way of thinking.
Ultimately you need to set the ItemsSource to an IEnumerable, preferably a ObservableCollection.
The quickest way to get started would be to put the ObservableCollection as a public property in your code-behind file:
public ObservableCollection<DirectoryInfo> files { get;set; }
Then in the constructor or a Load event on the Window, populate the collection with your data and then add to the Xaml declaration for your DataGrid:
ItemsSource = "{Binding Path=files}"
EDIT:
I tried this out using the DirectoryInfo class, in my code behind I added:
public ObservableCollection<DirectoryInfo> Dir = new ObservableCollection<DirectoryInfo>();
public Window1()
{
InitializeComponent();
Dir.Add(new DirectoryInfo("c:\\"));
Dir.Add(new DirectoryInfo("c:\\temp\\"));
dataGrid1.ItemsSource = Dir;
}
For some reason this was not working using the Databinding via Xaml, but I did not try very hard to get it to work.