The code for the target selected before stealing in the 1.12-60 version

This is my code, when I traverse through the object, I do "ObjectManager.Me.Target = target. Guid; "Select the target, but the bot will attack the target, and enter the battle, I just want to select the target and not attack, how do I need to change the code.

string[] objectNames = new string[] { "血色信徒"};

while (true)
{
    WoWUnit target = ObjectManager.GetObjectWoWUnit()
        .Where(o => objectNames.Contains(o.Name) && o.IsAlive)
        .OrderBy(o => o.GetDistance)
        .FirstOrDefault();

    if (target != null)
    {
 ObjectManager.Me.Target = target.Guid;
 SpellManager.CastSpellByNameLUA("偷窃");

                Thread.Sleep(100);
     

    }
        Thread.Sleep(1000);
}