用多线程啊,不要把耗时的操作都放主线程里

楼上兄弟说的正解

        //上传数据实现
        public bool UpLoading()
        {
            System.Threading.Thread.Sleep(100);
            string filename;
            int node_count = 0;
            filename = "/";

            //遍历树型控件
            if (GuanTreeView.Nodes[0] == null)
            {
                return false;
            }

            if (GuanTreeView.Nodes[0].Nodes[0] == null)
            {
                return false;
            }

            FileStream fs;
            string curr_path = System.Environment.CurrentDirectory;
            DateTime curr_date_time = new System.DateTime();
            curr_date_time = System.DateTime.Now;
            int i = 0;
            node_count = GuanTreeView.Nodes[0].GetNodeCount(true);
            for (i = 0; i < node_count; i++)
            {
                if (GuanTreeView.Nodes[0].Nodes[i].Checked == true)
                {
                    //组成文件名
                    string sel_string = this.GuanTreeView.Nodes[0].Nodes[i].Text.ToString();
                    string tmp1 = sel_string.Substring(0, sel_string.IndexOf('-'));

                    int i_start = Convert.ToInt32(tmp1);
                    int j = i_start / 1000;
                    file_name = curr_path + "\\tmp\\" + txtBranCode.Text + curr_date_time.Year.ToString() + curr_date_time.Month.ToString() + curr_date_time.Day.ToString() + j.ToString() + ".txt";

                    //先发送一个指令过去
                    string zhiling = "9999|" + txtBranCode.Text + curr_date_time.Year.ToString() + curr_date_time.Month.ToString() + curr_date_time.Day.ToString() + j.ToString() + ".txt|1|";

                    //接收到返回指令后开始传文件
                    byte[] buffer = new byte[2048];

                    buffer = Encoding.Default.GetBytes(zhiling);
                    LoginForm.m_socket.Send(buffer);
                    System.Threading.Thread.Sleep(10);
                    fs = File.Open(file_name, FileMode.Open);
                    StreamReader sr = new StreamReader(fs);

                    

                    zhiling = "9999|" + txtBranCode.Text + curr_date_time.Year.ToString() + curr_date_time.Month.ToString() + curr_date_time.Day.ToString() + j.ToString() + ".txt|2|";
                    buffer = Encoding.Default.GetBytes(zhiling);
                    LoginForm.m_socket.Send(buffer);
                    System.Threading.Thread.Sleep(100);
                }
            }

            return true;
        }

这是上传的方法 怎么多线程不能卡死

多线程操作，就不会影响主线程，比较简单的方法，定义一个TaskFactory taskFactory=new TaskFactory();
taskFactory.StartNew(()=>{里面是要放入多线程执行的代码  }); 比用Thread这个创建多线程简单，不懂上网查查就知道了

那执行完了怎么返回说执行完了？