C＃datagrid编辑单元MVVM

public DataView VariationGrid
    {
        get
        {
            if (_vargrid != null)
            {
                return _vargrid;
            }
            else
            {
                DataTable data = new DataTable();


                #region Columns
                foreach (var param in SelQuestion.QuestionParameters)
                {
                    DataColumn datac = new DataColumn(param.Name);
                    data.Columns.Add(datac);
                }
                #endregion

                #region Rows

                foreach (Variation variation in SelQuestion.Variations)
                {
                    DataRow datarow = data.NewRow();
                    foreach (var parameter in variation.QuestionParameters)
                    {

                        datarow[parameter.Key.Name] = parameter.Value;

                    }
                    data.Rows.Add(datarow);

                }
                #endregion
                return data.DefaultView;
            }

        }
        set
        {
            _vargrid = value;
            RaisePropertyChanged(\"VariationGrid\");
        }



    }

<DataGrid SelectedIndex=\"{Binding Path=SelectedRow}\" ItemsSource=\"{Binding Path=VariationGrid}\"  AutoGenerateColumns=\"True\" Height=\"153\" HorizontalAlignment=\"Left\" Margin=\"12,12,0,0\" Name=\"dataGrid3\" VerticalAlignment=\"Top\" Width=\"301\" >