Dynamic type instance creation

Question

I have a problem using dynamic types to instantiate a custom class. Example, I have the following class:

public class myClass<T>
{
    public myClass(String header);
}

If I use the following code, everything works fine:

var myInstance = new myClass<int>("myHeader");

However, I am in a position I don't have the int type defined, so I need to dynamically cast it from a generic type parameter. What I tried so far:

1.

    Type myType = typeof(int);
    var myInstance = new myClass<myType>("myHeader");

2.

    int myInt = 0;
    Type myType = myInt.GetType();
    var myInstance = new myClass<myType>("myHeader");

In all examples I get the following error:

The type or namespace name 'myType' could not be found (are you missing a using directive or an assembly reference?)

The reasons I cannot use int directly is because I am loading the types from specific assemblies at runtime, so they will not be "int" at all times.

Answer 1

For creating generic lists on the runtime, you have-to use Reflection.

int myInt = 0;
Type myType = myInt.GetType();

// make a type of generic list, with the type in myType variable
Type listType = typeof(List<>).MakeGenericType(myType);

// init a new generic list
IList list = (IList) Activator.CreateInstance(listType);

Update 1:

int myInt = 0;
Type myType = myInt.GetType(); 
Type genericClass = typeof(MyClass<>); 
Type constructedClass = genericClass.MakeGenericType(myType); 
String MyParameter = "value"; 
dynamic MyInstance = Activator.CreateInstance(constructedClass, MyParameter);