Question

I’m using a class that has an indexer defined and would like to get the data out of it and into a simple array. Is there a better way than looping through the indexer?

The indexer:

public class MyIndexer
{
    public int Foo { get; }
    public int GetSize{ get; }  //size of data vector
    public float this[int idx] { get; set; }
}

Something like this would be nice:

float[] data = indexer.GetData();

Note that I can’t change MyIndexer.

Answer 1

Since you can get the number of elements, you can create an extension method:

public static float[] GetData(this MyIndexer indexer)
{
    return Enumerable.Range(0, indexer.GetSize).Select(i => indexer[i]).ToArray();
}

You could also just use a for loop:

public float[] GetData(this MyIndexer indexer)
{
    float[] data = new float[indexer.GetSize];
    for(int i = 0; i < data.Length; i++)
    {
        data[i] = indexer[i];
    }
}