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Extension methods are a way to add methods to existing types without creating a new derived type, recompiling, or modifying the original type. In C#, an extension method is a static method defined in a static class, where the “this” keyword is applied to the first parameter, which specifies the type that the method extends. The first parameter specifies the type being extended, and it is followed by any additional parameters that the method requires.
Here’s an example of an extension method:
public static class StringExtensions
{
public static bool IsPalindrome(this string str)
{
int length = str.Length;
for (int i = 0; i < length / 2; i++)
{
if (str[i] != str[length - i - 1])
{
return false;
}
}
return true;
}
}
You can use this extension method like this:
string word = "racecar";
bool result = word.IsPalindrome();
The benefit of using extension methods is that they allow you to add new methods to types that you don’t have control over, such as those defined in the .NET framework or third-party libraries. They also make your code more readable and maintainable, as you can group related methods into a single static class and organize your code better. However, it’s important to note that extension methods have lower priority than instance methods of the same name, so it’s recommended to use them sparingly and in a way that does not conflict with existing methods.
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