Typically, I've seen people use the class literal like this: Class<Foo> cls = Foo.class; But what if the type is generic, e.g. List? This works fine, but has a warning since List should be parameterized: Class<List> cls = List.class So why not add a <?>? Well, this causes a type mismatch error: Class<List<?>> cls = List.class I ...
I have a method String Foo<T> where T: WebControl Now I do have a string like "hyperlink". What is want is to call Foo<Hyperlink> based on a mapping from the string to the generic. How does the dictionary have to look like? It ain't: private Dictionary<string, Type> _mapping = new Dictionary<string, Type>() { {"hyperlink", ty...
Is it possible to enumerate which types that is "available" in a generic constraint? T MyMethod<t>() where T : int, double, string Why I want to do this is that I have a small evaluator engine and would like to write code like this: bool expression.Evaluate<bool>(); or int expression.Evaluate<int>(); but i want to prohibit MyC...
I have a function written in C# which has one parameter type as Dictionary<string , string>. When i try to call this function in VB.Net it doesn't show the type as Dictionary<string , string> it shows as string. Below is my function public bool RegisterCustomerAttribute(int CustomerId , Diction...
Usually, when A is inheriting from B, all the members of A are automatically visible to B's functions, for example class A { protected: int a; }; class B : public A { int getA() {return a;} //no need to use A::a, it is automatically visible }; However when I'm inheriting with templates, this code becomes illegal (at least...
I am trying to do this: List<Parent> test = new List<Child>(); The complete code of my class is this: class Program { public static void Main(string[] args) { List<Parent> test = new List<Child>(); test.Add(new Child()); test.Add(new AnotherChild()); } } class Parent { } class Child : Parent { ...
I could use some really good links that explain Generics and how to use them. But I also have a very specific question, relater to working on a current project. Given this class constructor: public class SecuredDomainViewModel<TDomainContext, TEntity> : DomainViewModel<TDomainContext, TEntity> where TDomainContext : Doma...
In .NET, the Generics Lists have a sort function that accepts IComparer or Comparison. I'd like to sort just part of a list. Hopefully I can specify the start index, count of elements to sort, and a lambda function. It looks like you can only use lambda functions to do this if you're sorting the entire list. Is that right or did I mi...
I want to get type of TKey and TValue given a Dictionary<TKey,TValue> type. eg. If type is Dictionary<Int32,String> I want to know how to get keyType = typeof(Int32) and valueType = typeof(String) ...
Hello, I want to make a generic string to numeric converter, and provide it as a string extension, so I wrote the following code: public static bool TryParse<T>( this string text, out T result, IFormatProvider formatProvider ) where T : struct try { result = (T)Convert.ChangeType( text, typeof( T ), formatProvider ); return true;...
I was developing a small function when trying to run an enumerator across a list and then carry out some action. (Below is an idea of what I was trying to do. When trying to remove I got a "Collection cannot be modified" which after I had actually woken up I realised that tempList must have just been assigned myLists reference rather t...
I'm attempting to call a constructor method that looks like: public static SomeWrapper<T> method(Class<T> arg); When T is an unparameterized type like String or Integer, calling is straightforward: SomeWrapper<String> wrapper = method(String.class); Things get tricky when T is a parameterized type like List<String>. The following ...
I'm hashing a file with one or more hash algorithms. When I tried to parametrize which hash types I want, it got a lot messier than I was hoping. I think I'm missing a chance to make better use of generics or LINQ. I also don't like that I have to use a Type[] as the parameter instead of limiting it to a more specific set of type (H...
This question might seem trivial and also stupid at the first glance, but it is much more than this. I have an array of any type T (T[]) and I want to convert it into a List generic (List<T>). Is there any other way apart from creating a Generic list, traversing the whole array and adding the element in the List? Present Situation: st...
I'm using LINQtoSQL and I want to return a list of matching records for a CSV contains a list of IDs to match. The following code is my starting point, having turned a CSV string in a string array, then into a generic list (which I thought LINQ would like) - but it doesn't: Error Error 22 Operator '==' cannot be applied to operands of ...
What is the correct way to return a Void type, when it isn't a primitive? Eg. I currently use null as below. interface B<E>{ E method(); } class A implements B<Void>{ public Void method(){ // do something return null; } } ...
I want to write a generic function to calculate factorial in C# ... like: static T Factorial<T>(T n) { if (n <= 1) return 1; return Factorial<T>(n - 1); } but obviously having restriction that we can't perform operations on type 'T'. any alternative? ...
I'm working with Google Web Toolkit, and I'm having problems implementing a generic interface. I'm not really familiar with generics, doing an upgrade on someone else's code here. Here's what I want to do: I want to have an implementation of a generic callback interface that does some logging, and then subclass that implementation in or...
I want to create a generic method to serizlize a class to text (for use as part of a networking component) The method should be something like: public string SerializeToText<T>(T DataToSerialize); The method contents would simply perform the xml serialization and I can do this. What I want to know is if I can check whether T can be s...
Consider I have the following interface: public interface A { public void b(); } However I want each of the classes that implement it to have a different return type for the method b(). Examples: public class C { public C b() {} } public class D { public D b() {} } How would I define my interface so that this was possibl...