C# Array Move Item (Not ArrayList/Generic List)

Question

Have an object which is an array (not arraylist or generic) that could hold a set of anything...

[[One],[Two],[Three],[Four]]

Want to move [Four] to in front of [Two] e.g. oldIndex = 3, newIndex = 1 so the result would be...

[[One],[Four][Two],[Three]]

Whats the most effient way to do this in .NET 2.0, e.g.

PropertyInfo oPI = ObjectType.GetProperty("MyArray", BindingFlags.Public | BindingFlags.Instance);
object ObjectToReorder = oPI.GetValue(ParentObject, null);
Array arr = ObjectToReorder as Array;
int oldIndex = 3;
int newIndex = 1;
//Need the re-ordered list still attached to the ParentObject

thanks in advance

Answer 1

Try this

Array someArray = GetTheArray();
object temp = someArray.GetValue(3);
someArray.SetValue(someArray.GetValue(1), 3);
someArray.SetValue(temp, 1);

Answer 2

Hi Jared, thanks for your answer. Unfortunately I think your answer is incorrect.

If I step through your code with the array i gave then i get a different array to the one I required...

1. Array someArray = GetTheArray();
[[One],[Two],[Three],[Four]]

2. object temp = someArray.GetValue(3);
[[One],[Two],[Three],[Four]]
temp is [Four]

3. someArray.SetValue(someArray.GetValue(1), 3);
someArray.GetValue(1) is [Two]
[[One],[Two],[Three],**[Two]**]

4. someArray.SetValue(temp, 1);
[[One],**[Four]**,[Three],[Two]]

I wanted [[One],[Four],[Two],[Three]] (i.e. Move [Four] in-front of [Two])

Answer 3

void MoveWithinArray(Array array, int source, int dest)
{
  Object temp = array.GetValue(source);
  Array.Copy(array, dest, array, dest + 1, source - dest);
  array.SetValue(temp, dest);
}