Hello, and welcome! Are you ready to take your string manipulation skills in C# to the next level? Today, we'll explore a task that not only enhances your understanding of strings but also trains your ability to think creatively. The task at hand involves splitting a string into words, then reversing each word as if reflected in a mirror. Intrigued? Let's dive right in!

Consider a string filled with words. Your task is to write a C# function that accepts such a string. It then takes each of those words, reverses their character order, and finally stitches them all together to form a new string with reversed words.

Here's what you need to keep in mind:

• The input string will contain between 1 and 100 words.
• Each word is a sequence of characters separated by white space.
• A word is composed of characters ranging from a to z, A to Z, 0 to 9, or even an underscore _.
• The given string will not start or end with a space — double spaces will not appear either.
• After reversing the words, your program should return a single string with the words preserving their original order.

Example

Suppose that the input string is "Hello neat CSharp_123".

The function will work on this in the following fashion:

• Hello becomes olleH
• neat becomes taen
• CSharp_123 becomes 321_prahSC

The function now combines the obtained strings into one string, resulting in "olleH taen 321_prahSC".

Therefore, if Solution("Hello neat CSharp_123") is called, the returned value should be "olleH taen 321_prahSC".

Let's start breaking this down!

Our very first step requires us to separate the words in the sentence. C# provides us with a built-in Split method, which breaks a given string at a specified separator and outputs an array of words. If no argument is provided to the Split method, it defaults to using space as the separator. Here is a sample code to illustrate this:

// an initial example string
string inputStr = "Hello neat CSharp_123";

// split the string into words
string[] words = inputStr.Split();

foreach (string word in words)
{
    Console.WriteLine(word);
}

You will see the following printed out:

Hello
neat
CSharp_123

We've successfully extracted the words from the sentence, but they're not reversed yet. C# provides the Array.Reverse method, which we can use in conjunction with LINQ's Select and ToArray methods. Let's add these lines to our existing code:

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        // an example string
        string inputStr = "Hello neat CSharp_123";

        // split the string into words
        string[] words = inputStr.Split();

        // reverse each word
        string[] reversedWords = words.Select(word => new string(word.Reverse().ToArray())).ToArray();

        foreach (string reversedWord in reversedWords)
        {
            Console.WriteLine(reversedWord);
        }
    }
}

Aha! Now you can see the reversed words:

olleH
taen
321_prahSC

Finally, we need to bring these reversed words back together again into a string format, using space as a separator. We get to use String.Join for this. Here's the code to complete our task:

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        string result = Solution("Hello neat CSharp_123");
        Console.WriteLine(result);  // this will print: 'olleH taen 321_prahSC'
    }

    public static string Solution(string inputStr)
    {
        // split the string into words
        string[] words = inputStr.Split();
        
        // reverse each word
        string[] reversedWords = words.Select(word => new string(word.Reverse().ToArray())).ToArray();
        
        // join the words back together with space as a separator
        string result = String.Join(" ", reversedWords);
        
        return result;
    }
}

Well done! By completing this lesson, you've gained proficiency in manipulating strings in C#, especially when it comes to reversing the order of characters in a word. I hope you're feeling more confident and enthusiastic about your C# skills. Remember, the key to mastery is regular practice. Therefore, take a moment to explore related problems and practice what you’ve learned. It's all part of the joy of learning!