How to use dynamic object with generics in C#

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Hi,

I have a dynamic object created. I need to pass this as a generic type to a method. How would I able to achieve the same ?

Example :

Say I'm having an dynamic object obj, I have to fetch the type of this object and pass it to the method which expects a generic.

Type type = obj.GetType();

example - ClassA<t> class = new ClassA<t>();

What I have tried:

I have tried to pass type variable which has type of dynamic object obj to the ClassA<t> class = new ClassA<t>(); but this doesn't work.
Any idea how to handle this scenario ?

Posted 23-Mar-17 11:05am

sagar wasule

Updated 23-Mar-17 11:24am

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Richard Deeming · Accepted Answer · 2017-03-23T11:24:00

You won't be able to directly create a strongly-typed instance of the class, as the compiler doesn't have enough information to know what the closed generic type is.

You can create a late-bound instance of the type using reflection:

C#

Type t = obj.GetType();
Type myType = typeof(ClassA<>).MakeGenericType(t);
object instance = Activator.CreateInstance(myType);

Or you can use reflection to call a generic method to create and use the instance:

C#

static class Helper
{
    private static readonly MethodInfo DoStuffMethod = typeof(Helper).GetMethod("DoStuffHelper", BindingFlags.NonPublic | BindingFlags.Static);
    
    private static void DoStuffHelper<T>(T value)
    {
        var instance = new ClassA<T>();
        ...
    }
    
    public static void DoStuff(object value)
    {
        if (value == null) throw new ArgumentNullException(nameof(value));
        
        Type t = value.GetType();
        MethodInfo m = DoStuffMethod.MakeGenericMethod(t);
        m.Invoke(null, new[] { value });
    }
}