Useful Playlist features

How to skip a playlist item?

You can specify "skip" property to "true" for the item you'd like to skip in a playlist. 

Something like this: 

MItem item; 
myPlaylist.PlaylistGetByIndex(1, ..., out item); 
(item as IMProps).PropsSet("skip", "true"); 

How to play a random playlist item?

1. You have to initialize event.

m_objPlaylist.OnEvent += new IMEvents_OnEventEventHandler(m_objFile_OnEvent);

2. I choose the List for illustrative purposes as the source that contains all order numbers of the Playlist items. 

public List<int> list = new List<int>();

void CountList()
{
    int count = 0;
    double dur = 0;
    m_objPlaylist.PlaylistGetCount(out count, out dur);
    for (int i = 0; i < count; i++)
    {
        list.Add(i);
    }
}

3. A method that returns the random position.

private int randomPos;
private int GetRanPos()
{
    int ans;
    Random ran = new Random();
    int z = ran.Next(0, list.Count);
    ans = list[z];
    list.Remove(list[z]);
    return ans;
} 

4. Then you have to monitor the event that raises at the moment when the item is over. And then change a position of the Playlist to random. (More information about the events you can find in this article - Events).

private void M_objPlaylist_OnEventSafe(string bsChannelID, string bsEventName, string bsEventParam, object pEventObject)
{
    Marshal.ReleaseComObject(pEventObject);
    if (list.Count == 0)
    {
        Random.Checked = false;
        CountList();
    }
    if (Random.Checked)
    {
        if (bsEventName == "EOF")
        {
            randomPos = GetRanPos();
            m_objPlaylist.PlaylistPosSet(randomPos, 0, 0);
            m_objPlaylist.FilePlayStart();            
        }
    }
}