Review the solution for the create and throw exceptions challenge

5 minutes

The following code is one possible solution for the challenge from the previous unit:

string[][] userEnteredValues = new string[][]
{
            new string[] { "1", "2", "3"},
            new string[] { "1", "two", "3"},
            new string[] { "0", "1", "2"}
};

try
{
    Workflow1(userEnteredValues);
    Console.WriteLine("'Workflow1' completed successfully.");

}
catch (DivideByZeroException ex)
{
    Console.WriteLine("An error occurred during 'Workflow1'.");
    Console.WriteLine(ex.Message);
}

static void Workflow1(string[][] userEnteredValues)
{
    foreach (string[] userEntries in userEnteredValues)
    {
        try
        {
            Process1(userEntries);
            Console.WriteLine("'Process1' completed successfully.");
            Console.WriteLine();
        }
        catch (FormatException ex)
        {
            Console.WriteLine("'Process1' encountered an issue, process aborted.");
            Console.WriteLine(ex.Message);
            Console.WriteLine();
        }
    }
}

static void Process1(String[] userEntries)
{
    int valueEntered;

    foreach (string userValue in userEntries)
    {
        bool integerFormat = int.TryParse(userValue, out valueEntered);

        if (integerFormat == true)
        {
            if (valueEntered != 0)
            {
                checked
                {
                    int calculatedValue = 4 / valueEntered;
                }
            }
            else
            {
                throw new DivideByZeroException("Invalid data. User input values must be non-zero values.");
            }
        }
        else
        {
            throw new FormatException("Invalid data. User input values must be valid integers.");
        }
    }
}

Running this application generates the required output:

'Process1' completed successfully.

'Process1' encountered an issue, process aborted.
Invalid data. User input values must be valid integers.

An error occurred during 'Workflow1'.
Invalid data. User input values must be non-zero values.

This code is merely "one possible solution" because there are many ways to create and throw exceptions. As long as you got the right results per the rules in the challenge, then you did great!

If you succeeded, congratulations! Continue on to the knowledge check in the next unit.

Important

If you had trouble completing this challenge, maybe you should review the previous units before you continue on.

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