extension-methods

I am using extension methods OrderBy and ThenBy to sort my custom collection on multiple fields. This sort does not effect the collection but instead returns and IEnumberable. I am unable to cast the IEnumerable result to my custom collection. Is there anyway to change the order of my collection or convert the IEnumerable result to my custom collection? If your collection type implements IList<T> (to be able to Add() to it) you could write an extension method: public static Extensions { public static TColl ToTypedCollection<TColl, T>(this IEnumerable ien) where TColl : IList<T>, new() { TColl

I have a variable whose value is populated at runtime. I want to check whether that value is between two same datatype values (say lowest and highest) or not using an Extension Method. I want to check like int a = 2; //here static but is can be changed at runtime if(a.Between(0,8)) DoSomething(); else DoNothing(); If a is 0 or 8 or any value between them, it should return true . If a is (-1 or less) or (9 or greater) then it should return false i want to create an extension method like public static bool Between<T1>(this T1 val1, T1 lowest, T1 highest) where ???? { What code to write here????

lets say I have a list of strings: A,B,C,D Then another list of strings B,C,D I want to know what elements are in the first list that aren't in the second list, so the result would be A I don't know the name of the extension method to do this is. I know I can use concat, union, intersect for similar list comparisons, but just don't know the name to accomplish this particular task. Addendum, I am interested in duplicates, so if the first list is: A,A,A,B,C,D and the second list is B,C,D i want to get A,A,A Thanks! You can use the Except Extension Method to get all elements in a list that are

class String contains very useful method - String.Join(string, string[]) . It creates a string from an array, separating each element of array with a symbol given. But general - it doesn't add a separator after the last element! I uses it for ASP.NET coding for separating with " <br /> " or Environment.NewLine . So I want to add an empty row after each row in asp:Table . What method of IEnumerable<TableRow> can I use for the same functionality? I wrote an extension method: public static IEnumerable<T> Join<T>(this IEnumerable<T> src, Func<T> separatorFactory) { var srcArr = src.ToArray(); for

The IEnumerable extension method FirstOrDefault didn't exactly do as I wanted so I created FirstOrValue. Is this a good way to go about this or is there a better way? public static T FirstOrValue<T>(this IEnumerable<T> source, Func<T, bool> predicate, T value) { T first = source.FirstOrDefault(predicate); return Equals(first, default(T)) ? value : first; } Your code is probably incorrect; you probably haven't considered all of the cases. Of course, we cannot know if any code is correct or incorrect until we have a spec. So start by writing a one-line spec: " FirstOrValue<T> takes a sequence of

I currently have an extension method on System.Windows.Forms.Control like this: public static void ExampleMethod(this Control ctrl){ /* ... */ } However, this method doesn't appear on classes derived from Control, such as PictureBox. Can I make an extension method that appears not only in Control, but for classes derived from Control, without having to do an explicit cast? You must include the using statement for the namespace in which your extensions class is defined or the extension methods will not be in scope. Extension methods work fine on derived types (e.g. the extension methods defined