Extension Metod

Question

Hi.. I am working in c# and use Extension Method. Define Extension Method and syntax?

Jignesh Trivedi · Answer

hi try static void Main(string[] args) { var s = .ToStringExtension(); } public static class Extensions { public static string ToStringExtension(this string s) { return Convert.ToString(s); } } http://weblogs.asp.net/andrewrea/archive/2008/05/25/extension-methods-inside-net-3-5.aspx hope this help.

Mukesh Kumar · Answer

Hi Check this link : http://msdn.microsoft.com/en-us/library/bb383977.aspx

Vulpes · Answer

An extension method is a static method of a static class whose first (or only) parameter is qualified with the 'this' keyword. For example: static class StringExtensions { public static string Reverse(this string s) { // code } } Such a method can be used in C# as though it were an instance method of whatever type is qualified by 'this' in this case string. So you can write: string s = Hello; string r = s.Reverse(); For this to work the static class needs to be in scope - typically you ensure this by placing the static class in a namespace and then 'using' the namespace. If the type in question already has a method with the same name as the extension method then the former takes precedence. For further details and examples please see our recommended articles in the sidebar to the right of this thread.