Ошибка выдаваемая компилятором на олимпалном сайте

[BadCats]

Всем привет. На одном сайте в качестве олимпиадной задачи, ну или что то около того потребовалось написать метод проверки палиндромов
Вот самый простой алгоритм, который у меня получился

bool checkPalindrome(string inputString) {
bool flag = true;
            string str = inputString;
            char[] array = str.ToCharArray(1, inputString.Length);
           
            for (int i = 0; i < array.Length; i++)
            {
                while (array[i] == array[i + 1])
               {
                
                    if (array[i] == array[-i]) //aaaabcaaaa
                    {
                        flag= true;
                        return flag;
                    }
                    else
                    {
                        flag= false;
                        return flag;
                    }
                   
              }

В Visual Studio - все работает нормально, но на самом сайте проверка
"падает" со следующей ошибкой:

0/10
Execution error on test 1: Something went wrong when executing the solution - program stopped unexpectedly with an error.

System.Reflection.TargetInvocationE xception: Exception has been thrown by the target of an invocation. ---> System.ArgumentOutOfRangeException: Must be greater than the length of the string.
Parameter name: startIndex
at System.String.ToCharArray (Int32 startIndex, Int32 length) [0x00000] in <filename unknown>:0
at testingCSharp._runatuca.checkPalind rome (System.String inputString) [0x00000] in <filename unknown>:0
at (wrapper managed-to-native) System.Reflection.MonoMethod:Intern alInvoke (System.Reflection.MonoMethod,objec t,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
--- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0
at testingCSharp.TEST_0.run () [0x00000] in <filename unknown>:0

Кто может подсказать?

[p51x]

Вы забыли протестировать свой алгоритм на пустой строке.

[BadCats]

Спасибо, сейчас исправлю

[BadCats]

bool checkPalindrome(string inputString)
        {
            bool flag = true;
            string str = inputString;
            char[] array = str.ToCharArray(1, inputString.Length);
            if (inputString.Equals( null))
            {
                return false;
            }
            else
            {


                for (int i = 0; i < array.Length; i++)
                {
                    while (array[i] == array[i + 1])
                    {

                        if (array[i] == array[-i]) //aaaabcaaaa
                        {
                            flag = true;
                            return flag;
                        }
                        else
                        {
                            flag = false;
                            return flag;
                        }

                    }



                }
                return flag;
            }
        }

System.Reflection.TargetInvocationE xception: Exception has been thrown by the target of an invocation. ---> System.ArgumentOutOfRangeException: Must be greater than the length of the string.
Parameter name: startIndex
at System.String.ToCharArray (Int32 startIndex, Int32 length) [0x00000] in <filename unknown>:0
at testingCSharp._runigcbr.checkPalind rome (System.String inputString) [0x00000] in <filename unknown>:0
at (wrapper managed-to-native) System.Reflection.MonoMethod:Intern alInvoke (System.Reflection.MonoMethod,objec t,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
--- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0
at testingCSharp.TEST_0.run () [0x00000] in <filename unknown>:0

[p51x]

null и "" - две большие разницы