extension-methods

I wrote an extension method for String to get a char argument, string.Remove(char) . But when I used this, it instead called the default string.Remove(int) method. Shouldn't the presence of an actual method have higher priority than an implicit conversion? Instance methods have priority over extension methods. Your observation is proof of the same. When resolving which method to call, it will always pick a matching instance method over an extension method... which is intuitive in a way. Paraphrased from C# in depth, When the compiler sees that you're trying to call a method which looks like an

i have an extension method which a person was really helpful to give me... it does an orderby on IQueryable ... but i wanted one to do a normal IQueryable (non generic) Here is the code, The count and Skip and i think Take are missing . public static IQueryable GetPage(this IQueryable query, int page, int pageSize, out int count) { int skip = (int)((page - 1) * pageSize); count = query.Count(); //COUNT DOESN'T EXIST return query.Skip(skip).Take((int)pageSize); // NEITHER SKIP } Here is the and it works perfectly no errors. public static IQueryable<T> GetPage<T>(this IQueryable<T> query, int

Got an interesting oddity - thought someone might be able to help. This came out of some fun with nullable types from this question: How to check if an object is nullable? Option Strict On Module Test ' Call this overload 1 <Extension()> Function IsNullable(obj As ValueType) As Boolean Return False End Function ' Call this overload 2 <Extension()> Function IsNullable(Of T As {Structure})(obj As Nullable(Of T)) As Boolean Return True End Function Sub Test() ' a is an integer! Dim a As Integer = 123 ' calling IsNullable as an extension method calls overload 1 and returns false Dim result1 As

Extension methods are not good for testing (that's described here: Mocking Extension Methods with Moq , http://www.clariusconsulting.net/blogs/kzu/archive/2009/12/22/Howtomockextensionmethods.aspx ). But probably there are some solutions for mocking of Unity methods? In my case I have the following function: public class MyManager { public MyManager(IUnityContainer container) : base(container) { } public IResult DoJob(IData data) { IMyLog log = MyContainer.Resolve<IMyLog>(); ... use log.Id ... MyContainer.Resolve<...>();//usage for other purposes... } I want to be sure that 'DoJob' method will

I'm playing with ScriptCS (which is awesome!) but I couldn't figure out how to define an extension method within a .csx script file . Take this example: using System.IO; public static class Extensions { public static string Remove(this string source, params string[] toRemove) { foreach(var r in toRemove) { source = source.Replace(r,""); } return source; } } string[] entries = Directory .GetFiles( @"C:\Users\blah\blah", "*.mp4", SearchOption.AllDirectories) .Select( p => p.Remove("Users")) .ToArray(); foreach(var e in entries) { Console.WriteLine(e); } This yields the error: error CS1109:

In what circumstances (usage scenarios) would you choose to write an extension rather than sub-classing an object ? < full disclosure : I am not an MS employee; I do not know Mitsu Furota personally; I do know the author of the open-source Componax library mentioned here, but I have no business dealings with him whatsoever; I am not creating, or planning to create any commercial product using extensions : in sum : this post is from pure intellectal curiousity related to my trying to (continually) become aware of "best practices" > I find the idea of extension methods "cool," and obviously you