Task.Factory.StartNew()中执行清空集合不起作用

[weixin_38050648]

Task.Factory.StartNew(() =>
                                           
{
#if DEBUG
                                               
Stopwatch sw = new Stopwatch();
                                               
sw.Start();
#endif
                                               
//更新修改或删除数据到数据库
                                               
if (!SqlHelper.DataBaseHelper.ExecuteTransaction(compareSqls, null))
                                               
{
                                                   
MessageBox.Show("批量更新学校时出现错误");
                                                   
return;
                                               
}
                                               
compareSqls.Clear();
                                               

#if DEBUG
                                               
sw.Stop();
                                               
Trace.WriteLine("更新1000条耗时:" + sw.ElapsedMilliseconds);
#endif
                                           
});