如何传递和显示出这样一个值

Question

使用Timer  
     int num = 0;
        System.Windows.Forms.Timer timer;
        public void SetNum()
        {
            timer = new System.Windows.Forms.Timer();
            timer.Interval = 1000;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
        }        void timer_Tick(object sender, EventArgs e)
        {
            label1.Text = num.ToString();
            label1.Invalidate();
            num++;
        }

Answer 1

用委托,坛子里已经很多类似的例子了定义委托:        delegate void delegateShowText(string txt);        void showText(string txt)
        {
            if (this.InvokeRequired)
            {
                Invoke(new delegateShowText(showText), new object[] { txt });
            }
            else
            {                this.textBox1.Text = txt;
            }        }这里加一句
for(int i = 0; i <100;i++)
{
 num++;
 showTxt(num + "");
 sleep(1000);
}

Answer 2

Application.DoEvents
获取属性值

Answer 3

 public class Class1
    {
        public delegate void ChangeNumber(int num);
        public event ChangeNumber OnNumberChanged;        private int num;        public void Add()
        {
            for (int i = 0; i < 10; i++)
            {
                num++;
                Thread.Sleep(1000);
                if (OnNumberChanged != null)
                {
                    OnNumberChanged(num);
                }
            }
        }
    }
 private void button2_Click(object sender, EventArgs e)
        {
            Class1 c = new Class1();
            c.OnNumberChanged += new Class1.ChangeNumber(c_OnNumberChanged);
            Thread th = new Thread(new ThreadStart(c.Add));
            th.IsBackground = true;
            th.Start();
        }        void c_OnNumberChanged(int num)
        {
            if (textBox1.InvokeRequired)
            {
                textBox1.Invoke(new Class1.ChangeNumber(c_OnNumberChanged), new object[] { num}); 
            }
            else
            {
                textBox1.Text = num.ToString();
            }
        }

Answer 4

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            this.timer1.Enabled = true;
            this.timer1.Interval = 1000;
        }        int z = 0;        private void timer1_Tick(object sender, EventArgs e)
        {
            
            z ++;
            if (z == 101)
            {
                this.timer1.Enabled = false;
            }
            else
            {
                this.textBox1.Text = z.ToString();
            }
        }
    }

Answer 5

        private void button1_Click(object sender, EventArgs e)
        {
            int num = 0;
            for (int i = 0; i < 100; i++)
            {
                num++;
                this.textBox1.Text = num.ToString();
                System.Windows.Forms.Application.DoEvents();
                System.Threading.Thread.Sleep(1000);
            }
        }

Answer 6

class里面这样写    public class Class1
    {
        public delegate void MyEventHandler(int e);
        public event MyEventHandler OnProChange;        Thread th;        public void Loop()
        {
            th = new Thread(new ThreadStart(M1));
            th.Start();
        }        void M1()
        {
            for (int i = 0; i < 100; i++)
            {
                Thread.Sleep(1000);
                if (OnProChange != null)
                {
                    OnProChange(i);
                }
            }
        }
    }
Form上这样写        private void Form1_Load(object sender, EventArgs e)
        {
            Class1 cls = new Class1();
            cls.OnProChange += new Class1.MyEventHandler(cls_OnProChange);
            cls.Loop();
        }        void cls_OnProChange(int e)
        {
            CallBack(e);
        }        delegate void SetCallBack(int value);
        void CallBack(int value)
        {
            if (this.InvokeRequired)
            {
                SetCallBack SCB = CallBack;
                this.Invoke(SCB, new object[] { value });
            }
            else
            {
                textBox2.Text = value.ToString();
            }
        }

Answer 7

for(int i = 0; i <100;i++)
{
 num++;
 this.textbox1.text = num + "";
 application.Doevnt();//加上这句就哦了
 sleep(1000);//这句有没有都可以
}这个循环拷贝到Form里面

Answer 8

多线程，不论何种方案，（Thread,Timer,delegate,BackgroundWorker...)主要涉及一个跨线程访问控件属性的问题，这个的解决方案是多样的，可以1,Control.Invoke(){}...
2,
delegate.BegineInvok()
delegate.EndInvok()
3,
线程上下文封送
4，
利用BackgroundWork