An example of a neat trick to get a generic to work with an anonymous type.

anonymous_generic.cs

using System;

namespace TestAnonymousGeneric
{
    internal class MyClass<T>
    {
        public T val { get; set;} 
    
        public static MyClass<ET> Build<ET>(ET valValue)
        {
            return new MyClass<ET> {val = valValue};
        } 
    }

    internal class MoreComplex
    {
        public string foo { get; set; }

    }
    class Program
    {
        static void Main(string[] args)
        {
            //The "<int>" isn't really meaningful, the type used here doesn't matter. I use "int" since it's short.
            var foo = MyClass<int>.Build(new {Name="This is a Name", Count=1, Com=new MoreComplex()});
            //foo.val.Name = "Can't write to this. It's read only.";
            Console.WriteLine(foo.val.Name);
            foo.val.Com.foo = "This is writable";
        }
    }
}