}//end static method
public static string GetErrorMessage(this IOperationResult result, string description)
{
StringBuilder msg = new StringBuilder();
result.ValidationErrors.ForEach(error => msg.AppendLine(string.Format("[{0}]主键：{1}，错误：{2}", description, error.BillPKID, error.Message)));
result.GetFatalErrorResults().ForEach(error => msg.AppendLine(string.Format("[{0}]主键：{1}，错误：{2}", description, error.BillPKID, error.Message)));
return(msg.ToString());
}//end static method