source: OniSplit/Xml/XmlWriterExtensions.cs

using System;
using System.Text;
using System.Xml;

namespace Oni.Xml
{
    internal static class XmlWriterExtensions
    {
        public static void WriteFloatArray(this XmlWriter writer, float[] array)
        {
            writer.WriteArray(array, XmlConvert.ToString);
        }

        public static void WriteArray<T>(this XmlWriter writer, T[] array, Func<T, string> converter)
        {
            var text = new StringBuilder(array.Length * 8);

            for (int i = 0; i < array.Length; i++)
            {
                if (i != array.Length - 1)
                    text.AppendFormat("{0} ", converter(array[i]));
                else
                    text.Append(converter(array[i]));
            }

            writer.WriteValue(text.ToString());
        }
    }
}