C# generic methods, type parameters in new() constructor constraint

Not really; C# only supports no-args constructor constraints.

The workaround I use for generic arg constructors is to specify the constructor as a delegate:

public T MyGenericMethod<T>(MyClass c, Func<MyClass, T> ctor) {
    // ...
    T newTObj = ctor(c);
    // ...
}

then when calling:

MyClass c = new MyClass();
MyGenericMethod<OtherClass>(c, co => new OtherClass(co));

Related Contents:

  1. How to define generic type limit to primitive types?
  2. Pass An Instantiated System.Type as a Type Parameter for a Generic Class
  3. How to get the type of T from a member of a generic class or method
  4. In C#, why can’t a List object be stored in a List variable
  5. Passing arguments to C# generic new() of templated type
  6. What exactly is an “open generic type” in .NET? [duplicate]
  7. Generics in C#, using type of a variable as parameter [duplicate]
  8. Why isn’t there generic variance for classes in C# 4.0?
  9. Create instance of generic type whose constructor requires a parameter?
  10. Testing if object is of generic type in C#
  11. What’s the difference between SortedList and SortedDictionary?
  12. No generic implementation of OrderedDictionary?
  13. Why must I provide explicitly generic parameter types While the compiler should infer the type?
  14. C# Create New T()
  15. Does .NET have a way to check if List a contains all items in List b?
  16. Func with out parameter
  17. How do I implement IEnumerable
  18. foreach vs someList.ForEach(){}
  19. Why cannot C# generics derive from one of the generic type parameters like they can in C++ templates? [duplicate]
  20. What does “where T : class, new()” mean?
  21. No type inference with generic extension method
  22. Passing a single item as IEnumerable
  23. How do I make the return type of a method generic?
  24. How to compare values of generic types?
  25. How to call generic method with a given Type object? [duplicate]
  26. Why isn’t ArrayList marked [Obsolete]?
  27. Why can’t I assign a List to a List?
  28. What does “T” mean in C#?
  29. How to initialize a List to a given size (as opposed to capacity)?
  30. Get a generic method without using GetMethods
  31. Value of type ‘T’ cannot be converted to
  32. Static Generic Class as Dictionary
  33. Convert string to nullable type (int, double, etc…)
  34. explicitly cast generic type parameters to any interface
  35. Anonymous Types – Are there any distingushing characteristics?
  36. Generic Type in constructor
  37. A reusable pattern to convert event into task
  38. Convert DataTable to generic List?
  39. C# generic “where constraint” with “any generic type” definition?
  40. Generics: casting and value types, why is this illegal?
  41. Generic List – moving an item within the list
  42. Generics can’t infer second parameter? [duplicate]
  43. Ambiguous call between two C# extension generic methods one where T:class and other where T:struct
  44. Parse string to enum type
  45. Why generic IList does not inherit non-generic IList
  46. List readonly with a private set
  47. Declare a generic type instance dynamically [duplicate]
  48. Returning ‘IList’ vs ‘ICollection’ vs ‘Collection’
  49. Mocking generic methods in Moq without specifying T
  50. Why can’t I catch a generic exception in C#?

Leave a Comment