Task多线程
public partial class Test : Form{
static StringBuilder sb = new StringBuilder();
static int step = -1;
public Test()
{
InitializeComponent();
CheckForIllegalCrossThreadCalls = false;
}
private void button1_Click(object sender, EventArgs e)
{
step = -1;
sb = new StringBuilder();
string thread_id = Thread.CurrentThread.ManagedThreadId.ToString();
sb.AppendLine(string.Format("①当前线程ID：{0}", thread_id));
Task<int> t = Async3();//调用异步线程执行
sb.AppendLine("④/⑤主线程结束.");//直接运行下去 本句和Async1中的“⑤/④当前线程ID。。。”有可能是本句在前打印，也有可能是async1中打印在前，主要是因为是并行执行
timer1.Enabled = true;
//还有一个问题：本实验没有用到t值，比如取值用：t.Result，则会锁死在t.Result这句
}
public static int Async1()
{
string thread_id = Thread.CurrentThread.ManagedThreadId.ToString();
sb.AppendLine(string.Format("⑤/④当前线程ID：{0}", thread_id)); //子线程中运行，也就是说Async1函数其实是和UI线程中button1_Click的sb.AppendLine(...)是并行执行的
int sum = 0;
for (int i = 0; i < 999; i++)
{
sum += i;
}
return sum;
}
public static async Task<int> Async2()
{
string thread_id = Thread.CurrentThread.ManagedThreadId.ToString();
sb.AppendLine(string.Format("③当前线程ID：{0}", thread_id)); //也是UI线程
int result = await Task.Run(new Func<int>(Async1));//await标记之后，代码在子线程中执行。
thread_id = Thread.CurrentThread.ManagedThreadId.ToString();
sb.AppendLine(string.Format("⑥当前线程ID：{0}，result：{1}", thread_id, result)); //UI线程中执行
return result;
}
public static async Task<int> Async3()
{
string thread_id = Thread.CurrentThread.ManagedThreadId.ToString();
sb.AppendLine(string.Format("②当前线程ID：{0}", thread_id)); //UI线程
int result = await Async2();
thread_id = Thread.CurrentThread.ManagedThreadId.ToString();
sb.AppendLine(string.Format("⑦当前线程ID：{0}，result：{1}", thread_id, result));//UI线程中执行
step = 1;
return result;
}
private void timer1_Tick(object sender, EventArgs e)
{
if (step > 0)
timer1.Enabled = false;
textBox1.Text = sb.ToString();
}
}
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