通过选择器表达式创建匿名类型

Question

Is there a way to dynamically project a bunch of selector expressions into a new anonymous type that can be used for eg .Select() statements or combined member accessors?

Let's say I've got a class with 3 properties

public class DummyClass {

    public int Id { get; set; }
    public string Name { get; set; }
    public string Category { get; set; }

}

In order to access one of them using a member accessor, I can write something like this:

public class DummyClass...
    // x => x.Id
    public static Expression<Func<DummyClass, int>> IdAccessor = f => Id;

Same goes for the Name or Category member. Now I'd like to return both Id and Name as an anonymous type using both selectors.

// combined x => x.Id and x => x.Name into x => new { x.Id, x.Name }
return new { IdAccessor, NameAccessor }

However I'm stuck doing this dynamically as I'm not able to create an anonymous type using eg Expression.New() without knowing it's actual type.

---

EDIT

I rewrote the question with a different example that should clarify some more.

Answer 1

Not sure what you really mean by "both selectors", but this is how I would make use of anonymous type; when selecting specific values from a list of objects. Please comment if this is not what you mean.

var myDummies = new List<DummyClass> ...

var result = myDummes.Select(o => new 
{ 
    IdAccessor = o.Id, 
    NameAccessor = o.Name
    Header = String.Format("{0} ({1})", o.Name, o.Category)
});

foreach(var r in result) { ... }