C#•3mo ago

✅ Extension Methods

this is an extension method that i have read in the docs , my question is when i use this extension method as below code in that case the this keyword bind the sentence string inside method as i did not pass any parameter correct?

c#
namespace StringExtnsion
{
    public static class WordCountExtinsion
    {
        //this is used to bind the method to the main class 
        public static int WordCount(this String str)
        {
            string[] strings = str.Split(new char[] { ' ' , '?' });

            return strings.Length;
        }
    }
}

c#
namespace StringExtnsion
{
    public static class WordCountExtinsion
    {
        //this is used to bind the method to the main class 
        public static int WordCount(this String str)
        {
            string[] strings = str.Split(new char[] { ' ' , '?' });

            return strings.Length;
        }
    }
}

c#
string? sentence = "My Name Is Mina?mina";

Console.WriteLine(sentence.WordCount());

c#
string? sentence = "My Name Is Mina?mina";

Console.WriteLine(sentence.WordCount());

5 Replies

Servator•3mo ago

"Hello World!".WordCount()

"Hello World!".WordCount()

Yes it's correct.

blueberriesiftheywerecats•3mo ago

Basically it compiles to

WordCountExtension.WordCount("whatever")

WordCountExtension.WordCount("whatever")

steven preadly•3mo ago

i mean this in that case is the sentence correct

Jimmacle•3mo ago

yes, the this argument in an extension method is the object that you called the extension method on you did not pass it yourself, but like blueberries explained the compiler does some shuffling behind the scenes to pass it for you

steven preadly•3mo ago

ok thank you all

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✅ Extension Methods