Umbraco-CMS/src/Umbraco.ModelsBuilder.Embedded/TypeExtensions.cs

using System;

namespace Umbraco.ModelsBuilder.Embedded
{
    internal static class TypeExtensions
    {
        /// <summary>
        /// Creates a generic instance of a generic type with the proper actual type of an object.
        /// </summary>
        /// <param name="genericType">A generic type such as <c>Something{}</c></param>
        /// <param name="typeParmObj">An object whose type is used as generic type param.</param>
        /// <param name="ctorArgs">Arguments for the constructor.</param>
        /// <returns>A generic instance of the generic type with the proper type.</returns>
        /// <remarks>Usage... typeof (Something{}).CreateGenericInstance(object1, object2, object3) will return
        /// a Something{Type1} if object1.GetType() is Type1.</remarks>
        public static object CreateGenericInstance(this Type genericType, object typeParmObj, params object[] ctorArgs)
        {
            var type = genericType.MakeGenericType(typeParmObj.GetType());
            return Activator.CreateInstance(type, ctorArgs);
        }
    }
}