LowerCase and UpperCase Alternating c#

Question

I need convert a phrase words in uppercase and lowercase continuous (alternating).

Example.

Input:
the girl is pretty.

Output:
tHe GiRl Is PrEtTy

I have tried the code below but it only convert the first letter:

char[] array = texto.ToCharArray();
if (array.Length >= 1)
{
    if (char.IsLower(array[0]))
    {
        array[0] = char.ToUpper(array[0]);
    }
}
for (int i = 1; i < array.Length; i++)
{
    if (array[i - 1] == ' ')
    {
        if (char.IsLower(array[i]))
        {
            array[i] = char.ToUpper(array[i]);
        }
    }
}
return new string(array);

Thanks

Answer 1

Fancy solution using LINQ:

string someString = "the girl is pretty";
string newString = string.Concat(
    someString.ToLower().AsEnumerable().Select((c, i) => i % 2 == 0 ? c : char.ToUpper(c)));

This basically does the following:

1. Convert the string to lowercase.
2. Iterate over each character.
3. Convert every second character to upper case.
4. Join the characters into a single string.

A more “classical” solution could look like this:

string someString = "the girl is pretty";

StringBuilder sb = new StringBuilder();
bool uppercase = false;
foreach (char c in someString)
{
    if (uppercase)
        sb.Append(char.ToUpper(c));
    else
        sb.Append(char.ToLower(c));

    uppercase = !uppercase;
}

string newString = sb.ToString();