How do I handle a exception in a library in C#

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I have the code here where i manually throw arguementnullexception. I need to throw to the user but when i run the code it goes to the throw statement at the catch part rather at the place where the user calls it even after re-throwing.

What I have tried:

        public Services(string hostName) 
        {
            try
            {
               
                if (hostName!=null)
                {
    
                }
                else
                {
                    ManuallyThrowException(hostName); //if not try catch it displays here
                }
            }
            catch(Exception e)
            {
                throw; //but it is displaying here if try catch
            }
        }

public static void Main()
{
        Services(null); // i need to display exeception here
}

Posted 7-Apr-20 19:44pm

Member 14580921

Updated 7-Apr-20 22:15pm

v2

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Tomas Takac 8-Apr-20 2:23am

It is not clear what you are asking. The code is supposed to go to the catch in your method, then the same exception is re-thrown and caught somewhere up the call chain. Or crashes your program if not caught. The try-catch as shown in your example is useless, you may as well remove it. Anyway, I think you should update your question and also show the code which calls this method but you don't get the exception there as expected.

Member 14580921 8-Apr-20 3:25am

I have modified and added comments for clarity.Please help me how to achieve it

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Richard MacCutchan · Answer 1 · 2020-04-07T22:15:00

Solution 1

You need to catch the exception in your main method:

C#

try
{
    Services(null); // i need to display exeception here
}
catch (Exception me)
{
    Console.WriteLine(me.Message);
}

Posted 7-Apr-20 22:15pm

Richard MacCutchan