不显示DataGrid ItemsSource

Question

I hope someone can tell me the reason for this behaviour:

If I do the following:

<DataGrid ItemsSource="{Binding Model.Bytes}" .../>

My ViewModel constructor:

public ViewModel()
{
    Model = new Message();
    Model.Bytes.Add(new Byte(){Range = "42"});
}

Nothing happens and the output window doesn't show any errors.

But If I wrap this Byte collection:

public ICollection<Byte> Bytes
{
    get { return Model.Bytes; }
    set
    {
        Model.Bytes = value;
        RaisePropertyChanged(()=> Bytes);
    }
}

And write:

<DataGrid ItemsSource="{Binding Bytes}".../>

The datagrid shows the entry and I can add new ones.

My Message-Class

public Message()
{
    Bytes = new ObservableCollection<Byte>();
}

public virtual ICollection<Byte> Bytes
{
    get { return GetValue(() => Bytes); }
    set { SetValue(() => Bytes, value); }
}

I think it is a notification problem, but I don't know where or why...

Thank you in advance

Answer 1

 <DataGrid ItemsSource="{Binding Model.Bytes}" .../>

this means your DataContext have to be an object with a PUBLIC property MODEL, and the type of this property must have a PUBLIC property Bytes. if this is the case, then it just seems to be a notification problem.

simply check your DataContext and Binding at runtime with Snoop.