c# retrieving type of array element using reflection

Question

How do I instantiate an array property using Reflection based on the code below?

public class Foo
{
   public Foo()
   {
      foreach(var property in GetType().GetProperties())
      {
         if (property.PropertyType.IsArray)
         { 
            // the line below creates a 2D array of type Bar.  How to fix?
            var array = Array.CreateInstance(property.PropertyType, 0);
            property.SetValue(this, array, null);
         }
      }
   }
   public Bar[] Bars {get;set;}
}

public class Bar
{
    public string Name {get;set;}
}

O. R. Mapper · Accepted Answer · 2013-09-28 21:57:01Z

6

The first parameter of Array.CreateInstance expects the element type of the array. You pass the entire property type, which is, as you have just found out by checking property.PropertyType.IsArray, an array type (specifically, Bar[] - i.e. an array of Bar elements).

To get the element type of an array type, use its GetElementType method:

var array = Array.CreateInstance(property.PropertyType.GetElementType(), 0);

I suppose you will replace the zero passed to the second argument with a higher number when required, unless you actually want only empty arrays.

answered Sep 28, 2013 at 21:57

O. R. Mapper

20.9k11 gold badges76 silver badges128 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

c# retrieving type of array element using reflection

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related