I can't get latest value by ref parameter. WHY? [modified]

[codeadair]

There are two layers in my project. one is business layer,and the other is UI layer. In UI layer, i invoke the method 'SaveInfo' of business layer. by the way ServiceActivator.GetService. But i can't get 'newInfo' in UI layer. and if i remove 'throw ex;' in 'SaveInfo' method. i could get it. i don't know why. do you know? how could i get newInfo if i want to throw Exception to UI layer. pls. ths. 'SaveInfo' in Business layer: public void SaveInfo(ref StudentInfo info,ref List detailList,string strType) { try { ... info = newInfo; detailList = newDetailList; throw new MyException("Information already exist."); ... } catch(Exception ex) { throw ex; } } the invoke code in UI layer: try { ... mMyDs.SaveInfo(ref curInfo,ref curList,"Add"); ... ] catch(MyException mex) { textBox1.text = curInfo.Name; } catch(Exception ex) { }

MSN:msnadair@hotmail.com Skype:skyadair

modified on Tuesday, May 12, 2009 8:52 PM

[Henry Minute]

I have to say that returning to a calling process by throwing an exception is not the normal way to do it. It would be better to give SaveInfo() a return type of bool and instead of throw new MyException use return true;. Then in your calling code use

if (mMyDs.SaveInfo(ref curInfo,ref curList,"Add"))
{
    // do whatever you want if all is well
}
else
{
    // do whatever you want when it goes bad. e.g. throw an exception
}

Henry Minute Do not read medical books! You could die of a misprint. - Mark Twain Girl: (staring) "Why do you need an icy cucumber?" “I want to report a fraud. The government is lying to us all.”

[codeadair]

No,i can't. i need to do this. i should return the latest data from database if the info already exist. and the info may have different status, i should throw out the hint.

MSN:msnadair@hotmail.com Skype:skyadair