使用别名时无法隐式转换类型错误

Question

I am new to learning C# and am coming from a C++ background. I am using an alias in the following manner:

using CreationFunction = Func<Microsoft.Xna.Framework.Vector2, GAShooter.Entity>;

Then in my class I have a dictionary like so:

private Dictionary<String, CreationFunction> creators;

However when I try to initialize it in the contstructor like this:

creators = new Dictionary<String, CreationFunction>();

I get an error. It says that it cannot implicitly convert the type. What gives?

EDIT: full code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using CreationFunction = Func<Microsoft.Xna.Framework.Vector2, GAShooter.Entity>;

namespace GAShooter
{
    class EntityFactory
    {
        private Dictionary<String, CreationFunction> creators;

        public EntityFactory()
        {
            creators = new Dictionary<String, CreationFunction>();
        }

        public void RegisterCreator(String name, CreationFunction function)
        {
            creators[name] = function;
        }

        public Entity Create(String name)
        {
            var creator = creators[name];
            return creator();
        }
    }
}

and the full text for the error is:

cannot implicitly convert type 'Dictionary<string,Func <Microsoft.Xna.Framework.Vector2, GAShooter.Entity> to type 'Dictionary<String, CreationFunction>'

Answer 1

I think the problem is in your alias definition, you should change it to

using CreationFunction = System.Func<Microsoft.Xna.Framework.Vector2, GAShooter.Entity>;

Create a using alias to make it easier to qualify an identifier to a namespace or type. The right side of a using alias directive must always be a fully-qualified type regardless of the using directives that come before it.

read more here .