请教个菜鸟问题 在类中更新窗体上的控件
可以做把form的对象传给类 不过想用委托实现 整半天正不明白了 最好能给个简单的小例子 多谢
[解决办法]
class A
{
public event EventHandler viewProcess;
private void RaiseviewProcess(object sender, EventArgs e)
{
if (viewProcess != null)
{
viewProcess(sender, e);
}
}
private void aaaa()
{
RaiseviewProcess(this,new EventArgs());
}
}
class Form1
{
public Form1()
{
....
A a1= new A();
a1.viewProcess += (o,e) = > { 更新控件代码 };
}
}
DataCls data1 = new DataCls(1, mre1);
DataCls data2 = new DataCls(2, mre2);
thread1.Start(data1);
thread2.Start(data2);
WaitHandle.WaitAll(mres.ToArray());
lock (obj)
{
richTextBox1.AppendText("任务已完成");
}
}
public delegate void SetTextHanlder(string msg);
private void invokeMsg(String obj){
if (richTextBox1.InvokeRequired)
{
richTextBox1.BeginInvoke(new SetTextHanlder(SetText), new object[] { obj });
}
}
private void SetText(string msg)
{
lock (obj)
{
richTextBox1.AppendText("\r\n" + msg);
}
//}
}
private void DoWork(object obj)
{
Invoke(new SetTextHanlder(SetText), new object[] { obj });
}
}
//消通知委托
public delegate void MessageNotice(string msg);
//任务类
public class Task
{
public event MessageNotice OnMessageNotice;
public void DoWork(object state)
{
DataCls data = state as DataCls;
MessageNoticeHandler(string.Format("每{0}个任务正在执行......", data.count));
//执行任务 具体任务就不写了用sleep代表任务要用很长时间。
Thread.Sleep(3000);
MessageNoticeHandler(string.Format("每{0}个任务执行完成", data.count));
data.m_mre.Set();
}
protected void MessageNoticeHandler(string msg)
{
if (OnMessageNotice != null)
{
OnMessageNotice(msg);
}
}
}
public class DataCls
{
public ManualResetEvent m_mre;
public int count;
public DataCls(int i,ManualResetEvent mre)
{
count = i;
m_mre = mre;
}
}
[解决办法]
class MyClass
{
Action<string> UpdateLabel;
public MyClass(Action<string> updatelabel)
{ UpdateLabel = updatelabel; }
public void Func()
{
if (UpdateLabel != null) UpdateLabel("hello");
}
}
窗体调用：
MyClass mc = new MyClass((x) => { label1.Text = x; });
mc.Func();
[解决办法]
