SafeManipulation problem from Arrays More Exercises

Здравейте. Трябва ми малко помощ за тази задача:

Ето го и моят код...пропускам някой case, но не ми идват повече идеи:

https://pastebin.com/QwPhG7GL

Problem 1.Safe Manipulation

Now we need to make our program safer and more user-friendly. Make the program print “Invalid input!” if we try to replace an element at a non-existent index or an invalid command is written on the console. Also make the program work until the command “END” is given as an input.

Input

On the first line, you will receive the string array
On the next lines until you receive “END” – you will receive commands

Output

At the end, print the array in the following format:

{1st element}, {2nd element}, {3rd element} … {nth element}

Constraints

Only a single whitespace will be used for the separator.
n will be an integer in the interval [1…100]

Examples

Input	Output
one one one two three four five Distinct Reverse Replace 7 Hello Replace -5 Hello Replace 0 Hello END	Invalid input! Invalid input! Hello, four, three, two, one
Input	Output
Alpha Bravo Charlie Delta Echo Foxtrot Distinct Reverse Replace 0 Charlie Reverse Replace 1 Charlie Distinct Replace 4 Charlie END	Invalid input! Invalid input! Alpha, Charlie, Delta, Echo

Здравей, проблема е при командата Replace смених ти try-catch конструкцията с един if-else

ето промененият код:

using System;
using System.Linq;

namespace SafeManipulation
{
class Program
{
static void Main(string[] args)
{
string[] array = Console.ReadLine().Split(' ').ToArray();
string[] command = new string[3];

while (command[0] != "END")
{
command = Console.ReadLine().Split(' ').ToArray();

if (command[0] == "Distinct")
{
array = array.Distinct().ToArray();
}

else if (command[0] == "Reverse")
{
array = array.Reverse().ToArray();
}

else if (command[0] == "Replace")
{
int index = int.Parse(command[1]);

if (index < 0 || index > array.Length - 1)
{
Console.WriteLine("Invalid input!");
}
else
{
array[index] = command[2];
}
}

else if (command[0] == "END")
{
goto finish;
}

else
{
Console.WriteLine("Invalid input!");
}
}

finish: Console.WriteLine(string.Join(", ", array));

}
}
}