extension-methods

问题 Follwing convention(s) are given. Each Action has a single parameter of type BaseRequest with data depending on the Action . The ViewModel is always of type BaseResponse . What I'm trying to do is, that if a View contains a form, the POST -Action requires some sort of BaseRequest . How can I achieve correct-model binding as of the ViewModel is BaseResponse ? I already tried to add a property of XYZRequest in XYZResponse so I could bind like @Html.ChecBoxFor(m => m.RequestObject

问题 I stumbled with this issue, if I define a class class MyClass<T,U> { internal T myEement {get;set;} public MyClass(T Element) { myEement = Element; } } And declare extensions. static class MyClassExtension{ //What I want to do public static void nonWorkingExtension<P,T,U>(this P p, U u) where P:MyClass<T,U> { T Element = p.myEement; //Do something with u and p.Element } //What I have to do public static void workingExtension<P, T, U>(this P p, T dummy, U u) where P : MyClass<T, U> { T Element

问题 Re-written everything exactly as my program has it: class DictionaryInitializer { public class DictionarySetup { public string theDescription { get; set; } public string theClass { get; set; } } public class DictionaryInit { //IS_Revenues data public Dictionary<int, DictionarySetup> accountRevenue = new Dictionary<int, DictionarySetup>() { { 400000, new DictionarySetup {theDescription="Call", theClass="Revenues"}}, { 400001, new DictionarySetup {theDescription="Bill", theClass="Revenues"}}, {

问题 I have an async delegate which I await in the async method: async Task M1() { Debug.WriteLine("M1.A"); await Task.Delay(10); Debug.WriteLine("M1.B"); } async Task M2() { Debug.WriteLine("M2.A"); await Task.Delay(1); Debug.WriteLine("M2.B"); } delegate Task MyDel(); async void button_Click(object sender, RoutedEventArgs e) { MyDel del = null; del += M1; del += M2; await del(); } The output is: M1.A M2.A M2.B M1.B That is, both invocation members go off simultaneously, not awaiting each other.

问题 I wrote a method that extends System.Linq class. My ContainsAnyWord method allows me to search all words in a string against a string instead of comparing one string to another. Here is the method that I wrote to extend Linq public static class LinqExtension { public static bool ContainsAnyWord(this string value, string searchFor) { if (!string.IsNullOrWhiteSpace(value) && !string.IsNullOrWhiteSpace(searchFor)) { value = value.ToLower(); IEnumerable<string> tags = StopwordTool.GetPossibleTags

问题 I have read that is recomended to use functions instead of predicates in the extension methods, so I am trying to do it. public static void Insert<T>(this ObservableCollection<T> paramOC, T NewElement, Func<T, T, bool> condition) { //code } I am trying to use in this way: myOC.Insert(myNewElement, e=>e.Name.CompareTo(myNewElement.Name) > 0)); But I get an error that says that the delete System.Func does not take 1 argument. However, if I use a predicate intead of the function, it works. What

问题 The pertinent parts of my code are below. In the MyTreeView class (last block of code below), the line of code TncExtensions.TncNodeAdd(this, myTreeViewNode); generates the error CS7036 There is no argument given that corresponds to the required formal parameter 'myTreeViewNode' of 'TncExtensions.TncNodeAdd(TreeNodeCollection, MyTreeView_Abstract, MyTreeViewNode_Abstract)' Why can't the compiler figure out what the 2nd formal parameter is for my TreeNodeCollection extension method? public

问题 I'd like to get access to a ViewController from an extension and then override a function from a library which should change variables or invoke methods from a specific ViewController (in this case "ViewController"). How can I do that? Or is there a more recommended option? (Hint: I don't want to instantiate a new VC) import PopupDialog class ViewController: UIViewController { //e.g. variable and method to access from extension var score: Int = 0; func startGame(){ ... } } extension

问题 Suppose I have the following record type: open System.Collections.Generic type Store = { Products: List<Product>; } member this.TotalNumberOfItems = this.Products.Sum(fun p -> p.NumberInInventory) I want to sum a count of total items in the store as in the method above, however the System.Collections.Generic.List extension methods don't seem to be available. Intellisense does not show them. How can I call Sum from F#? 回答1: You just need to open the System.Linq namespace. For example: open

问题 I am trying to create a protocol that allows any object to be instantiated using JSON NSData. I am trying to create an extension to [String: String] dictionary that conforms to this protocol. Unfortunately for some reason the following code doesn't work: public protocol InitializableWithData { init(data: NSData?) throws } extension Dictionary: InitializableWithData where Key: String, Value: String { public init(data: NSData?) { self.init() // Parse NSData into a [String: String] } } I get the