Runtime creation of generic Func<T>
You use Delegate.CreateDelegate
, i.e. from a MethodInfo
; below, I've hard-coded, but you would use some logic, or Expression
, to get the actual creation method:
using System;
using System.Reflection;
class Foo {}
static class Program
{
static Func<T> GetFactory<T>()
{
return (Func<T>)GetFactory(typeof(T));
}
static object GetFactory(Type type)
{
Type funcType = typeof(Func<>).MakeGenericType(type);
MethodInfo method = typeof(Program).GetMethod("CreateFoo",
BindingFlags.NonPublic | BindingFlags.Static);
return Delegate.CreateDelegate(funcType, method);
}
static Foo CreateFoo() { return new Foo(); }
static void Main()
{
Func<Foo> factory = GetFactory<Foo>();
Foo foo = factory();
}
}
For non-static methods, there is an overload of Delegate.CreateDelegate
that accepts the target instance.