[DEVEXPRESS/WPF] GridColumn 클래스 : Validate 이벤트를 사용해 컬럼 값 검증하기

using System;

using DevExpress.Xpf.Grid;

...

#region 단가 그리드 컬럼 값 검증하기 - unitPriceGridColumn_Validate(sender, e)

/// <summary>
/// 단가 그리드 컬럼 값 검증하기
/// </summary>
/// <param name="sender">이벤트 발생자</param>
/// <param name="e">이벤트 인자</param>
private void unitPriceGridColumn_Validate(object sender, GridCellValidationEventArgs e)
{
    Product product = e.Row as Product;

    if(product == null)
    {
        return;
    }

    bool discontinued = product.Discontinued;

    if(discontinued)
    {
        double newValue  = Convert.ToDouble(pGridCellValidationEventArgs.Value    );
        double cellValue = Convert.ToDouble(pGridCellValidationEventArgs.CellValue);

        double discount = 100d - (newValue * 100) / cellValue;

        if(!(e.IsValid = dDiscount > 0 && discount <= 30d))
        {
            e.ErrorType = DevExpress.XtraEditors.DXErrorProvider.ErrorType.Critical;

            if(discount < 0)
            {
                e.ErrorContent = string.Format
                (
                    "The price cannot be greater than ${0}",
                    Convert.ToDouble(e.CellValue)
                );

                return;
            }

            e.ErrorContent = string.Format
            (
                "The discount cannot be greater than 30% (${0}). Please correct the price.",
                Convert.ToDouble(e.CellValue) * 0.7
            );
        }
    }
}

#endregion