extension-methods

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question Recreating java.lang.String is not hard. See attached code. I'm really writing this to show how easy it is. If anybody wants to figure out how to get the native isBigEndian() and add it in the solutions, that'd be great. Other String methods would be great too. Just put this

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question Recreating java.lang.String is not hard. See attached code. I'm really writing this to show how easy it is. If anybody wants to figure out how to get the native isBigEndian() and add it in the solutions, that'd be great. Other String methods would be great too. Just put this

问题 Is this Extension method thread safe? public static class Extensions { public static void Raise<T>(this EventHandler<T> handler, object sender, T args) where T : EventArgs { if (handler != null) handler(sender, args); } } or do I need to change it to this? public static class Extensions { public static void Raise<T>(this EventHandler<T> handler, object sender, T args) where T : EventArgs { var h = handler; if (h!= null) h(sender, args); } } 回答1: You found an interesting loop hole, it tripped

问题 Is this Extension method thread safe? public static class Extensions { public static void Raise<T>(this EventHandler<T> handler, object sender, T args) where T : EventArgs { if (handler != null) handler(sender, args); } } or do I need to change it to this? public static class Extensions { public static void Raise<T>(this EventHandler<T> handler, object sender, T args) where T : EventArgs { var h = handler; if (h!= null) h(sender, args); } } 回答1: You found an interesting loop hole, it tripped

问题 I have recently migrated my code to Swift 4 . There is an issue that I am facing with extensions , i.e.: Declarations from extensions cannot be overridden yet I have already read multiple posts regrading this issue. But none of them entertains the scenario described below: class BaseCell: UITableViewCell { //Some code here... } extension BaseCell { func isValid() -> String? { //Some code here... } } class SampleCell: BaseCell { //Some code here... override func isValid() -> String? //ERROR..!

问题 I was wondering if a C# extension method of some class could act as an implementation of interface? What do I have: An iterface: public interface IEventHandler { void Notify(SEvent ev, IEventEmmiter source); } A class that implements it: class Sim : IEventHandler { /*public void Notify(SEvent ev, IEventEmmiter source) { Console.WriteLine("Got notified: " + ev.Name); }*/ } And a class that contains the extension method: public static class ReflectiveEventDispatcher { public static void Notify

问题 I was wondering if a C# extension method of some class could act as an implementation of interface? What do I have: An iterface: public interface IEventHandler { void Notify(SEvent ev, IEventEmmiter source); } A class that implements it: class Sim : IEventHandler { /*public void Notify(SEvent ev, IEventEmmiter source) { Console.WriteLine("Got notified: " + ev.Name); }*/ } And a class that contains the extension method: public static class ReflectiveEventDispatcher { public static void Notify

问题 I want to filter a list using LINQ with Where extension method. But apart from filtering I also want to update a global variable inside Where . However I cannot do it. Consider this example: var list = new List<string> { "1", "2", "3", "4", "5" }; bool flag = false; var newList = list.Where(item => { flag = true; return item == "2"; }); // Here I expect flag = true, but in fact it's false Console.Write(flag); As you can see I set flag = true , still the value flag == false after execution. It

问题 To my knowledge this in a extension method is passed as a ref variable. I can verify this by doing public static void Method<T>(this List<T> list) { list.Add(default(T)); } List<int> ints = new List<int>(new int[] { 1, 2, 3, 4, 5 }); ints.Method(); My List<int> ints is now 1, 2, 3, 4, 5, 0 . However when I do public static void Method<T>(this List<T> list, Func<T, bool> predicate) { list = list.Where(predicate).ToList(); } List<int> ints = new List<int>(new int[] { 1, 2, 3, 4, 5 }); ints

问题 To my knowledge this in a extension method is passed as a ref variable. I can verify this by doing public static void Method<T>(this List<T> list) { list.Add(default(T)); } List<int> ints = new List<int>(new int[] { 1, 2, 3, 4, 5 }); ints.Method(); My List<int> ints is now 1, 2, 3, 4, 5, 0 . However when I do public static void Method<T>(this List<T> list, Func<T, bool> predicate) { list = list.Where(predicate).ToList(); } List<int> ints = new List<int>(new int[] { 1, 2, 3, 4, 5 }); ints