Wpf MVVM binding List<List<string>> to datagrid

Question

I want bind property of model to datagrid, i can't do it I have property in model model contains list with list of strings rows count is constant in list

public class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        [NotifyPropertyChangedInvocator]
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public class TestViewModel : ViewModelBase
    {
        public TestViewModel()
            : this(new FileService())
        {
        }

        public TestViewModel(IFileService fileService)
        {

            var list = new List<List<string>>();
            list.Add(new List<string>() { "1", "2", "3" });
            list.Add(new List<string>() { "3", "4", "5" });
            RecodListFromCsv = list;
        }

        private List<List<string>> _RecodListFromCsv;

        public List<List<string>> RecodListFromCsv
        {
            get { return _RecodListFromCsv; }
            set
            {
                if (_RecodListFromCsv != value)
                {
                    _RecodListFromCsv = value;
                    OnPropertyChanged("RecodListFromCsv");
                }
            }
        }
    }

xaml

<Window x:Class="Test.Views.TestView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:viewModel="clr-namespace:Test.ViewsModel"
        Title="PriceList" Height="427" Width="746">
    <Window.Resources>
        <viewModel:TestViewModelx:Key="TM" />
    </Window.Resources>    
    <DockPanel LastChildFill="True" DataContext="{Binding Source={StaticResource TM}}">
            <DataGrid AutoGenerateColumns="True" ItemsSource="{Binding RecodListFromCsv}">
            </DataGrid>
        </Menu>
    </DockPanel>
</Window>

and UI show enter image description here

What I'm doing wrong. how to do it?

Reza ArabQaeni · Accepted Answer · 2014-10-12 10:25:05Z

1

Each row item of datagrid is type of List<string> so auto generating column of datagrid generate public property of List<string> object(Capacity,Count)!. So to resolve this quickly instead of List<List<string>> using List<Tuple<string,string,string>> if your items number is 3.

var list = new List<Tuple<string,string,string>>();
list.Add(new Tuple<string,string,string>() { "1", "2", "3" });
list.Add(new Tuple<string,string,string>() { "3", "4", "5" });
RecodListFromCsv = list;

The stable solution is create a persistent class and create list of that object class properly.

answered Oct 12, 2014 at 10:25

Reza ArabQaeni

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