我的功能是在有预订请求时保存客户数据。有两个条件:即使客户数据尚未填写,也强制保存预订或使用完整的客户数据保存预订。
我执行try catch并向用户引发异常,以防程序发现该客户不存在以确认用户是否想要创建新的客户数据。如果是,请打开新表单,如果没有,则强制程序保存。
在迫使程序保存的内部,如果存在,我想捕获其他异常。
目前,我这样做。
try
{
booking = new Booking();
booking.RoomID = roomID;
booking.Tel = txtTel.Text;
booking.PersonalID = txtId.Text;
booking.Name = txtBookBy.Text;
booking.CheckinDate = dtpCheckin.Value;
booking.CheckoutDate = dtpCheckin.Value.AddDays(Convert.ToDouble(cbNight.SelectedItem));
mng.SaveBooking(booking, false);
if (MessageBox.Show("Data is saved") == DialogResult.OK)
{
this.Close();
}
}
catch (NewCustomerException ex)
{
DialogResult dialog = MessageBox.Show("Customer doesn't exist in database. Do you want to create new customer?", "Please confirm", MessageBoxButtons.YesNo);
if (dialog == DialogResult.Yes)
{
String param = txtBookBy.Text + "," + txtTel.Text + "," + txtId.Text;
CustomerForm oForm = new CustomerForm(param);
oForm.Show();
}
else if (dialog == DialogResult.No)
{
try
{
mng.SaveBooking(booking, true);
}
catch (Exception ex1)
{
MessageBox.Show(ex1.Message);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
答案 0 :(得分:4)
您永远不会使用例外来控制程序的流程。
mng.SaveBooking(booking, false);
应该返回true / false来表示客户不存在的调用代码。
最好编写一个方法,只返回这些信息,然后使用该信息编写以下代码
try
{
// Check if customer already registered
if(mng.CustomerExists(CustomerKey))
{
mng.SaveBooking(booking, false);
if (MessageBox.Show("Data is saved") == DialogResult.OK)
{
this.Close();
}
}
else
{
DialogResult dialog = MessageBox.Show("Customer doesn't exist in database. " +
"Do you want to create new customer?", "Please confirm", MessageBoxButtons.YesNo);
if (dialog == DialogResult.Yes)
{
.....
}
else
{
.....
}
}
}
catch(Exception ex)
{
... somthing unexpected here
}
答案 1 :(得分:0)
单独设置try catch块,以便每个try catch块都遵循单一责任。在catch块中,您可以管理它抛出异常的语句,您可以在下一个try catch块中使用该manage语句结果。
try {
booking = new Booking();
booking.RoomID = roomID;
booking.Tel = txtTel.Text;
booking.PersonalID = txtId.Text;
booking.Name = txtBookBy.Text;
booking.CheckinDate = dtpCheckin.Value;
booking.CheckoutDate = dtpCheckin.Value.AddDays(Convert.ToDouble(cbNight.SelectedItem));
mng.SaveBooking(booking, false);
if (MessageBox.Show("Data is saved") == DialogResult.OK) {
this.Close();
}
}
catch (NewCustomerException ex) {
DialogResult dialog = MessageBox.Show("Customer doesn't exist in database. Do you want to create new customer?", "Please confirm", MessageBoxButtons.YesNo);
}
if (dialog == DialogResult.Yes) {
String param = txtBookBy.Text + "," + txtTel.Text + "," + txtId.Text;
CustomerForm oForm = new CustomerForm(param);
oForm.Show();
}
else if (dialog == DialogResult.No) {
try {
mng.SaveBooking(booking, true);
}
catch (Exception ex1) {
MessageBox.Show(ex1.Message);
}
}
}