我需要在单独的线程中调用类方法。该方法有一个参数和一个返回值。
详细信息:
我有一个带有两个文本框的表单。用户在第一个文本框中输入值,并在第二个文本框中获得结果:
Wiki级别必须使用维基百科API:
详细信息:
我有一个带有两个文本框的表单。用户在第一个文本框中输入值,并在第二个文本框中获得结果:
private void tbWord_TextChanged(object sender, TextChangedEventArgs e)
{
tbResponce.Text = Wiki.DoWork(tbWord.Text);
}
Wiki级别必须使用维基百科API:
public class Wiki
{
private class State
{
public EventWaitHandle eventWaitHandle = new ManualResetEvent(false);
public String result;
public String word;
}
private static void PerformUserWorkItem( Object stateObject )
{
State state = stateObject as State;
if(state != null)
{
Uri address = new Uri("http://en.wikipedia.org/w/api.php?action=opensearch&search=" + state.word);
HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
HttpWebResponse responce = (HttpWebResponse)request.GetResponse();
StreamReader myStreamReader = new StreamReader(responce.GetResponseStream(), Encoding.GetEncoding(1251));
state.result = myStreamReader.ReadToEnd();
state.eventWaitHandle.Set();
}
}
public static String DoWork(String _word)
{
State state = new State();
state.word = _word;
ThreadPool.QueueUserWorkItem(PerformUserWorkItem, state);
state.eventWaitHandle.WaitOne();
return state.result;
}
}
问题
当用户在tbWord中按键时,主窗体会冻结并等待Wiki类完成所有工作。
我该如何异步运行DoWork?