Changing Cell Color according to IF condition in C# WPF source code

Question

I have a Datagrid in a form in C# WPF, as it is possible to execute a method recovers each Cell contained in that Datagrid and assign a possible value, or change the background color?

For example I have a Datagrid:

[ A ] [ D ] [ C ] [ C ]
[ B ] [ A ] [ B ] [ A ]
[ C ] [ A ] [ B ] [ D ]

And then I want to make a loop of repetition:

for (i<TamanhoDeLinhas) // Andar Linha
  for(j<TamanhodeColunas) // Andar Coluna
     if(DataGrid[i][j].Conteudo == A)
       DataGrid[i][j].BackGround = Color.Red;

It is possible to do this?

Or else, I have the corresponding values of I J, or I know in which position the values will be! I have to change the Cell background on line i=2 and j=3. How is this possible? Recovers Cell and assigns a new color according to its position or by reading one by one?

The Datagrid in question is linked to a Datatable and it generates columns and rows automatically, in case it is dynamic. then I do Datagrid.Sourceitems = Datatable.Defaultview ... And so I play all the items for the Datagrid.

Any of the solutions is valid.

Answer 1

If you know the ratings, I took that test:

public DataGridCell GetCell(DataGridCellInfo cellInfo)
{
  var cellContent = cellInfo.Column.GetCellContent(cellInfo.Item);
  if (cellContent != null)
     return (DataGridCell)cellContent.Parent;
  return null;
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
  var cellInfo = new DataGridCellInfo(gd.Items[0], gd.Columns[2]);
  var cell = GetCell(cellInfo);
  cell.Background = Brushes.Red;
}

Understanding that in the window Loaded you have already assigned the values to your grid.

Answer 2

Create an extension. For example, DataGridExtensions.cs:

public static class DataGridExtensions
{
    public static DataGridCell GetCell(this DataGrid grid,  DataGridRow linha, int indiceColuna = 0)
    {
        if (linha == null) return null;

        var presenter = linha.FindVisualChild<DataGridCellsPresenter>();
        if (presenter == null) return null;

        var cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(indiceColuna);
        if (cell != null) return cell;

        grid.ScrollIntoView(linha, grid.Columns[indiceColuna]);
        cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(indiceColuna);

        return cell;
    }
}

Recover the cell:

var cell = meuDataGrid.GetCell(linha, indiceColuna);

Using the correct color type, both cases will work. WPF Background is the type System.Windows.Media.Brush.

Examples of use with recovered cell:

// using System.Windows.Media;

cell.Background = Brushes.White;
cell.Background = new SolidColorBrush(Color.White);
cell.Background = new SolidColorBrush(Color.FromArgb(0xFF, 0xFF, 0, 0));
cell.Background = System.Windows.SystemColors.MenuHighlightBrush;