C# .NET - Help with generic list

  Huggy Bear replied to John O'Hara

Aryan Hi, Extension methods enable you to "add" methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. Extension methods are a special kind methods that are actually defined in a type. The most common extension methods are the LINQ standard query operators that add query functionality to the existing System.Collections . IEnumerable and System To use the standard query operators, first bring them into scope with a using System.Linq directive. Then any type that implements IEnumerable ( T ) appears to have instance methods such as not a requirement for extension methods. They allow you to extend an existing type with new functionality, without having to sub-class or recompile the old type. For instance, you might like to know whether a certain whole lot of those kind of functions, you would put them together in a utility class, like this: public class MyUtils { public static bool IsNumeric( string s) { float output; return float .TryParse(s, out output Yes" ); else Console.WriteLine( "No" ); However, with Extension Methods, you can actually extend the String class to support this directly. You do it by defining a static class, with a set

namespaces causes the validation error template not to appear in the UI so I always remove these namespaces when I notice that they are not in use. The XAML Organizer add the add-in. Figure 1. XAML Organizer Screenshot This add-in can do the following: remove unused namespaces, sort attributes, and fix format. It is important to note that each command only works when the XAML is valid because I used LINQ to XML to parse the XAML. To better understand what these commands do, let’s try to use the add-in on the following XAML code. < Window x:Class = "WpfApplication.MainWindow" xmlns = "http: / / schemas.microsoft.com / winfx / 2006 / xaml / presentation" xmlns:x = "http: / / schemas Width = "120"> RadioButton < / RadioButton > < / ScrollViewer > < / Grid > < / Window > Listing 1. XAML Code Example First, let’s remove unused namespaces. In the preceding listing, the namespace clr-namespace:WpfApplication named local is not used. Clicking on the Removed Unused Namespaces menu item yields the following XAML. < Window x:Class = "WpfApplication.MainWindow" xmlns = "http: / / schemas.microsoft.com / winfx / 2006 / xaml / presentation" xmlns:x = "http: / / schemas namespaces in the root element. Another important thing to note is that this command might remove a namespace declaration that is in use if there are two or more namespace declarations

started, became idle, and is persisted to the database. Then, you realize that the Order class should have another property to address some defect. I believe that implementing side by side machine workflow that is hosted as a WCF service. This workflow contains 4 states: Initial, New, Processed, and Completed. The service interface provides 3 operations: CreateOrder, ProcessOrder, and CloseOrder. Each operation is implemented by a ReceiveActivity in the workflow. When we click on the New Order button, the workflow is started and an Order object is assigned to a property of the workflow. The current state is then set to the New state. In our WPF application, the current state is distinguished by the thick black border the serialized data. This data is in binary form because the SqlWorkflowPersistenceService uses the BinaryFormatter class for serialization and deserialization. Type and Assembly Changes Making changes to an assembly name or the namespace or name of a type. In our example, the workflow uses an Order class, which is shown below. namespace DataTransferObjects { [Serializable] [DataContract] public class Order { [DataMember] public int Id { get; set; } [DataMember] public string Customer { get; set; } } } Listing 1. Order Class This class is defined in the DataTransferObjects assembly. Let’s say we decided to sign