原函数代码为:
public void fun()//在线程中执行的方法,必须为公有void类型方法,不能有参数。
{
while(true)//死循环,线程将一直运行
{
int x = Convert.ToInt16(label1.Text);
x++;
label1.Text=Convert.ToString(x);
thread.Join(1000);//休眠1秒钟,休眠一次,线程运行了1秒钟
}
}
错误:-----线程间操作无效: 从不是创建控件“label1”的线程访问它。然后查到可以使用委托:修改如下:
private Thread thread;
delegate void SetValueEventHandler(Label label, int num);
void SetValueEvent(Label label, int num)
{
label.Text = Convert.ToString(num);
} public void fun()//在线程中执行的方法,必须为公有void类型方法,不能有参数。
{
while(true)//死循环,线程将一直运行
{
int x = Convert.ToInt16(label1.Text);
x++;
Invoke(new SetValueEventHandler(********code need*************));
//label1.Text = Convert.ToString(x);
thread.Join(1000);//休眠1秒钟,休眠一次,线程运行了1秒钟
}
} private void button1_Click(object sender, EventArgs e)
{
thread= new Thread(new ThreadStart(fun));//生成线程类对象
label1.Text="0";
thread.Start();
button1.Enabled=false;
button2.Enabled=true;
button3.Enabled=false;
button4.Enabled=true;
}
当:Invoke(new SetValueEventHandler(label1,x));---------------错误提示为"应输入方法".
********code need**************中应该怎么样写委托的参数,谢谢!
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delegate void dSetValueEventHandler();
dSetValueEventHandler SetValueEventHandler;void SetValueEvent()
{
label.Text = Convert.ToString(num);
}public void fun()//在线程中执行的方法,必须为公有void类型方法,不能有参数。
{
while(true)//死循环,线程将一直运行
{
int x = Convert.ToInt16(label1.Text);
x++;
num=x;
this.BeginInvoke(SetValueEventHandler); //调用该方法
//label1.Text = Convert.ToString(x);
thread.Join(1000);//休眠1秒钟,休眠一次,线程运行了1秒钟
}
}
private void button1_Click(object sender, EventArgs e)
{
SetValueEventHandler=new dSetValueEventHandler(SetValueEvent); //实例化该委托
thread= new Thread(new ThreadStart(fun));//生成线程类对象
label1.Text="0";
thread.Start();
button1.Enabled=false;
button2.Enabled=true;
button3.Enabled=false;
button4.Enabled=true;
}
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading; public class MyFormControl : Form
{
public delegate void AddListItem(String myString);
public AddListItem myDelegate;
private Button myButton;
private Thread myThread;
private ListBox myListBox;
public MyFormControl()
{
myButton = new Button();
myListBox = new ListBox();
myButton.Location = new Point(72, 160);
myButton.Size = new Size(152, 32);
myButton.TabIndex = 1;
myButton.Text = "Add items in list box";
myButton.Click += new EventHandler(Button_Click);
myListBox.Location = new Point(48, 32);
myListBox.Name = "myListBox";
myListBox.Size = new Size(200, 95);
myListBox.TabIndex = 2;
ClientSize = new Size(292, 273);
Controls.AddRange(new Control[] {myListBox,myButton});
Text = " 'Control_Invoke' example ";
myDelegate = new AddListItem(AddListItemMethod);
}
static void Main()
{
MyFormControl myForm = new MyFormControl();
myForm.ShowDialog();
}
public void AddListItemMethod(String myString)
{
myListBox.Items.Add(myString);
}
private void Button_Click(object sender, EventArgs e)
{
myThread = new Thread(new ThreadStart(ThreadFunction));
myThread.Start();
}
private void ThreadFunction()
{
MyThreadClass myThreadClassObject = new MyThreadClass(this);
myThreadClassObject.Run();
}
}
public class MyThreadClass
{
MyFormControl myFormControl1;
public MyThreadClass(MyFormControl myForm)
{
myFormControl1 = myForm;
}
String myString; public void Run()
{
for (int i = 1; i <= 5; i++)
{
myString = "Step number " + i.ToString() + " executed";
Thread.Sleep(400);
// Execute the specified delegate on the thread that owns
// 'myFormControl1' control's underlying window handle with
// the specified list of arguments.
myFormControl1.Invoke(myFormControl1.myDelegate,
new Object[] {myString});
}
}
}
{
int x = Convert.ToInt16(label1.Text);
x++;
label1.Text = Convert.ToString(x);
}
public void fun()//在线程中执行的方法,必须为公有void类型方法,不能有参数。
{
while (true)//死循环,线程将一直运行
{
MethodInvoker In = new MethodInvoker(change);
this.BeginInvoke(In);
thread.Join(1000);//休眠1秒钟,休眠一次,线程运行了1秒钟
}
}
//---------------------------------------------------------
private void button1_Click(object sender, EventArgs e)
{
thread = new Thread(new ThreadStart(fun));//生成线程类对象
label1.Text = "0";
thread.Start();
button1.Enabled = false;
button2.Enabled = true;
button3.Enabled = false;
button4.Enabled = true;
}