How to Pass Parameters to Activator CreateInstance T

Question

I want to create an instance of a type that I specify in a generic method that I have  This type has a number of overloaded constructors  I d like to be able to pass arguments to the constructors  but   Activator CreateInstance lt T gt      doesn t see to have this as an option   Is there another way to do it

User · Answer

There is another way to pass arguments to CreateInstance through named parameters.

Based on that, you can pass a array towards CreateInstance. This will allow you to have 0 or multiple arguments.

public T CreateInstance<T>(params object[] paramArray)
{
  return (T)Activator.CreateInstance(typeof(T), args:paramArray);
}

User · Answer

As an alternative to Activator CreateInstance  FastObjectFactory in the linked url preforms better than Activator  as of  NET 4 0 and significantly better than  NET 3 5  No tests stats done with  NET 4 5   See StackOverflow post for stats  info and code   How to pass ctor args in Activator CreateInstance or use IL

User · Answer

public class AssemblyLoader lt T gt   where T class       public void            var res   Load   C  test paquete uno dos test dll    paquete uno dos clasetest dll               public T Load string assemblyFile  string objectToInstantiate                 var loaded   Activator CreateInstanceFrom assemblyFile  objectToInstantiate  Unwrap             return loaded as T

User · Answer

Keep in mind though that passing arguments on Activator CreateInstance has a significant performance difference versus parameterless creation   There are better alternatives for dynamically creating objects using pre compiled lambda  Of course always performance is subjective and it clearly depends on each case if it s worth it or not    Details about the issue on this article   Graph is taken from the article and represents time taken in ms per 1000 calls

User · Answer

Yes    T Activator CreateInstance typeof T   param1  param2

[c#] How to Pass Parameters to Activator.CreateInstance<T>()

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