Split and remove duplicate from String

I want to split the given string and remove the duplicate from that string. Like I have following string:

This is my first post in stack overflow, I am very new in development and 开发者_运维技巧I did not have much more idea about the how to post the question.

Now I want to split that whole string with white space and that new array will did not have duplicate entry.

How can I do this?

"This is my first post in stack overflow, I am very new in development and I did not have much more idea about the how to post the question."
    .Split()                       // splits using all white space characters as delimiters
    .Where(x => x != string.Empty) // removes an empty string if present (caused by multiple spaces next to each other)
    .Distinct()                    // removes duplicates

Distinct() and Where() are LINQ extension methods, so you must have using System.Linq; in your source file.

The above code will return an instance of IEnumerable<string>. You should be able to perform most operations required using this. If you really need an array, you can append .ToArray() to the statement.

add the array into a HashSet<String>, this would remove the duplicates. here is Micorosft documentation on HashSet..

    static void Main()
    {
        string str = "abcdaefgheijklimnop";
        char[] charArr = str.ToCharArray();
        int lastIdx = 0;
        for (int i = 0; i < str.Length;)
        {
            for (int j = i + 1; j < str.Length - 1; j++)
            {
                if (charArr[i] == charArr[j])
                {   
                    //Console.WriteLine(charArr[i]);   
                    int idx = i != 0 ? i - 1 : i;
                    lastIdx = j;
                    string temp = str.Substring(idx, j - idx);
                    Console.WriteLine(temp);
                    break;
                }
            }
            i++;
        }

        Console.WriteLine(str.Substring(lastIdx));

}