namespace ThreadClass
{
 public partial class Form1 : Form
    {
        private ThreadClass1 thread1, thread2;
        public Form1()
        {
            InitializeComponent();
            thread1 = new ThreadClass1(100, progressBar1, label1);
            thread2 = new ThreadClass1(200, progressBar2, label1);
        }
    }

   public class ThreadClass1
    {
        private ProgressBar progressBar1;
        private Label label1;
        private int ntime;
        private Thread thread1;
        public void UpdatePB(ProgressBar p1)
        {
            p1.Value += 1;
        }
        public void UpdateLB(Label l1, String sText)
        {
            l1.Text += sText;
        }
        public delegate void InvokeUpdatePB(ProgressBar p1);
        public delegate void InvokeUpdateLB(Label l1, string sText);
        public ThreadClass1(int nTime, ProgressBar p1, Label l1)
        {
            ntime = nTime;
            label1 = l1;
            progressBar1 = p1;
            thread1 = new Thread(new ThreadStart(Fun));
            thread1.Start();
        }

        public void Fun()
        {
            InvokeUpdatePB pb1 = new InvokeUpdatePB(UpdatePB);
            while (progressBar1.Value != 100)
            {
                if (progressBar1.InvokeRequired)
                {
                    progressBar1.Invoke(pb1, new object[] { progressBar1 });
                    Thread.Sleep(ntime);
                }
                else
                {
                    progressBar1.Value += 1;
                    Thread.Sleep(ntime);
                }
            }

            InvokeUpdateLB lb1 = new InvokeUpdateLB(UpdateLB);
            if (label1.Text == "")
            {
                if (label1.InvokeRequired)
                {
                    label1.Invoke(lb1, new object[] { label1, "線程１結束"});
                } 
                else
                {
                    label1.Text = "線程1結束";
                }
            } 
            else
            {
                if (label1.InvokeRequired)
                {
                    label1.Invoke(lb1, new object[] { label1, ", 線程2結束" });
                }
                else
                {
                    label1.Text += ", 線程2結束";
                }
            }
        }

    }
｝