static public string ReadTextRandomLine(this Stream item, RandIntSource source)
{
StreamReader reader = new StreamReader(item);
if (item.CanSeek)
{
item.Position = source.GetIndex((int)item.Length);
if (reader.ReadLine() != null)
{
string line = reader.ReadLine();
if (line != null)
{
return(line);
}
}
item.Position = 0;
return(reader.ReadLine());
}
return(reader.ReadLines().ToList().GetRandom(source));
}
static public int GetIndex(int count)
{
return(SOURCE.GetIndex(count));
}
static public T GetRandom <T>(this IList <T> item, RandIntSource source)
{
return(item.Get(source.GetIndex(item.Count)));
}
static public void RemoveEndingRandom <T>(this IList <T> item, RandIntSource source, int index_limit = 0)
{
item.RemoveEnding(source.GetIndex(item.Count).BindAbove(index_limit));
}
static public void RemoveBeginningRandom <T>(this IList <T> item, RandIntSource source, int index_limit = int.MaxValue)
{
item.RemoveBeginning(source.GetIndex(item.Count).BindBelow(index_limit));
}