// 通貨形式を設定します
flexGrid1.Columns[2].Format = "C2";
// 数値形式を設定します
flexGrid1.Columns[3].Format = "N1";
// 短い日付形式を設定します
flexGrid1.Columns[5].Format = "D";
// 時間形式を設定します
flexGrid1.Columns[6].Format = "t";

public sealed partial class ConditionalFormattingOfCell : Window
    {
        public ConditionalFormattingOfCell()
        {
            this.InitializeComponent();
            // FlexgridをDataSourceにバインドします
            var data = Customer.GetCustomerList(100);
            flexGrid1.ItemsSource = data;
            flexGrid1.Columns[4].DataMap = new GridDataMap() { ItemsSource = Customer.GetCountries(), DisplayMemberPath = "Value", SelectedValuePath = "Key" };
            // CellFactoryを使用して、条件付き書式を適用します
            flexGrid1.CellFactory = new MyCellFactory();
            flexGrid1.MinColumnWidth = 85;
        }
    }
    public class MyCellFactory : GridCellFactory
    {
        public override void PrepareCell(GridCellType cellType, GridCellRange range, GridCellView cell, Thickness internalBorders)
        {
            base.PrepareCell(cellType, range, cell, internalBorders);
            var orderCountColumn = Grid.Columns["OrderCount"];
            if (cellType == GridCellType.Cell && range.Column == orderCountColumn.Index)
            {
                var cellValue = Grid[range.Row, range.Column] as int?;
                if (cellValue.HasValue)
                {
                    // OrderCountが30未満の場合は、セルのbackColorを赤に設定します。それ以外の場合は緑に設定します。
                    cell.Background = new SolidColorBrush(cellValue < 30.0 ? Color.FromArgb(0xFF, 0xFF, 0x70, 0x70) : Color.FromArgb(0xFF, 0x8E, 0xE9, 0x8E));
                }
            }
        }
        public override void BindCellContent(GridCellType cellType, GridCellRange range, FrameworkElement cellContent)
        {
            base.BindCellContent(cellType, range, cellContent);
            var orderTotalColumn = Grid.Columns["OrderTotal"];
            var orderCountColumn = Grid.Columns["OrderCount"];
            if (cellType == GridCellType.Cell && range.Column == orderTotalColumn.Index)
            {
                var label = cellContent as TextBlock;
                if (label != null)
                {
                    var cellValue = Grid[range.Row, range.Column] as double?;
                    if (cellValue.HasValue)
                    {
                        // For OrderTotal< $5000.0, set ForeColor of cell to DeepPink, else Blue
                        label.Foreground = new SolidColorBrush(cellValue < 5000.0 ? Colors.DeepPink : Colors.Blue);
                    }
                }
            }
            if (cellType == GridCellType.Cell && range.Column == orderCountColumn.Index)
            {
                var label = cellContent as TextBlock;
                if (label != null)
                {
                    var cellValue = Grid[range.Row, range.Column] as int?;
                    if (cellValue.HasValue)
                    {
                        label.Foreground = new SolidColorBrush(Colors.Black);
                    }
                }
            }
        }
        public override void UnbindCellContent(GridCellType cellType, GridCellRange range, FrameworkElement cellContent)
        {
            base.UnbindCellContent(cellType, range, cellContent);
            var label = cellContent as TextBlock;
            if (label != null)
            {
                label.ClearValue(TextBlock.ForegroundProperty);
            }
        }