private void btnExport_Click(object sender, EventArgs e)
{
var patients = patientBLL.GetTodayPatients();
var data = patientBLL.Export(patients);
string fileName = DateTime.Now.ToString("yyyy-MM-dd") + "营养液发放记录.csv";
string filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, fileName);
File.WriteAllText(filePath, data, Encoding.UTF8);
Process.Start(filePath);
}
