多线程的有关问题

                             {                        ...                        labPK->Text="排课开始";            //新线程            ThreadStart^ ts=gcnew ThreadStart(this,&Form1::Start);            t=gcnew Thread(ts);            t->Start();            //Start();    //开始排课                                    //t->Join();                //while(t->IsAlive);            t->ThreadState;            //if(startstate)//等待线程结束            labPK->Text="完毕！";                        ...                       }private:Void Start()        {         ...        }

delegate void SetTextCallback(String^ text);private: void SetText(String^ text)        {            // InvokeRequired required compares the thread ID of the            // calling thread to the thread ID of the creating thread.            // If these threads are different, it returns true.            if (labPK->InvokeRequired)            {                    SetTextCallback^ d = gcnew SetTextCallback(this,&Form1::SetText);                labPK->Invoke(d, gcnew array<Object^>{ text });            }            else            {                labPK->Text = text;            }        }//设置进度条                delegate void Setpb(int value);              private:Void SetpbPK(int value)        {            if(value<=pbPK->Maximum)            if(pbPK->InvokeRequired)            {                Setpb ^pb=gcnew Setpb(this,&Form1::SetpbPK);                                pbPK->Invoke(pb,gcnew array<Object^>{ value });            }            else            {                pbPK->Value++;            }        }