Question

In my view there is a DataGrid and its ItemsSource is bound to a Filelist from 3 different folders.

Is it possible to switch the binding source programatically?

E.g. for the first click ItemsSource="{Binding FileList}
and for the second click ItemsSource="{Binding FileList1}

Is this possible in the same DataGrid? I’m following MVVM and i use Prism.

Answer 1

Yes it is possible to change the data context on click or on some other action..
You said that you are using MVVM prism… here is a sample i have created to assist you..

In this sample my source(in your case it is datagrid) itemssource property will always binded to a property “Sourcelist” and on click i am re assigning the Sourcelist to diffrent list..
so on every click we are reassigning the sourcelist property which is binded to datagrid or list

class Viewmodel : ViewModelBase
    {
        public Viewmodel()
        {
            ChangeDataSource = new DelegateCommand<object>(ChagneDataSource);
            Filelist1 = new FileListOne();
            FileList2 = new FileListTwo();
            Filelist1.Files = new List<string>();
            FileList2.Files = new List<string>();
            for (int i = 0; i < 10; i++)
            {
                Filelist1.Files.Add("FileListOne " + i);
                FileList2.Files.Add("FileListTwo " + i);
            }

            Sourcelist = Filelist1;
        }

        private object _sourcelist;

        public object Sourcelist
        {
            get
            {
                return _sourcelist;
            }
            set
            {
                _sourcelist = value;
                OnPropertyChanged("Sourcelist");
            }
        }


        public ICommand ChangeDataSource { get; set; }

        public FileListOne Filelist1 { get; set; }

        public FileListTwo FileList2 { get; set; }

        private void ChagneDataSource(object seder)
        {
            if (Sourcelist.GetType() == typeof(FileListOne))
                Sourcelist = FileList2;
            else
                Sourcelist = Filelist1;
        }
    }

    class FileListOne
    {
        public List<string> Files { get; set; }
    }


    class FileListTwo
    {
        public List<string> Files { get; set; }
    }

XAML

<StackPanel>
        <ListBox x:Name="listbox2" ItemsSource="{Binding Sourcelist.Files}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding}"/>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <Button x:Name="button" Content="Button" Command="{Binding ChangeDataSource}"/>

    </StackPanel>