给用户加单独锁

private static readonly object objLock = new object();
private static readonly Dictionary<long, object> objLockDics = new Dictionary<long, object>();

lock (objLock) 
{
　　if (!objLockDics.ContainsKey(member.Id))
　　{
　  　　objLockDics.Add(member.Id, new object());
　　}               

}
lock (objLockDics[member.Id])
{
}