Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# C# Objects Inheritance Catching Exceptions

FEI LI
FEI LI
828 Points
Posted by FEI LI
FEI LI
828 Points

I don't know how to write inside the "try" block

and what's the logic? Do I have to throw an exception before I use try and catch?

Program.cs 
int value = int.Parse(Console.ReadLine());

if (value < 0 || value > 20)
{
    throw new System.Exception();

}
try{
    value ;
   }
catch(Exception)
{
    Console.WriteLine("value is out of bounds!");
}


Console.WriteLine(string.Format("You entered {0}",value));

1 Answer

Chris Jones
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Chris Jones
Java Web Development Techdegree Graduate 23,933 Points
Chris Jones
.a{fill-rule:evenodd;}techdegree seal-36
Chris Jones
Java Web Development Techdegree Graduate 23,933 Points

Hey FEI,

In order to catch the exception, it needs to be thrown inside the TRY block. So, you'll need to wrap the existing code in a TRY-CATCH block like so:

int value = int.Parse(Console.ReadLine());

try
{
    if (value < 0 || value > 20)
    {
        throw new System.Exception();
    }
    Console.WriteLine(string.Format("You entered {0}",value));
}
catch (Exception)
{
    Console.WriteLine("Value is out of bounds!");
}

If the IF statement returns true, then an exception is thrown. Then exception is caught in the CATCH block and "Value is out of bounds!" is written to the console.

Let me know if you have any more questions!

FEI LI
FEI LI
828 Points
FEI LI
FEI LI
828 Points

WoW, now it makes more sense... Thank you so much!