static void Main(string[] args)
{
Console.WriteLine($"主线程1：{Thread.CurrentThread.ManagedThreadId.ToString()}");
dele.BeginInvoke(CallbackFun, "899");
Console.WriteLine($"主线程2：{Thread.CurrentThread.ManagedThreadId.ToString()}");
Console.ReadKey();
}
private void Form1_Load(object sender, EventArgs e)
{
mydele = new Mydele(GetText);
var s1s = Thread.CurrentThread.ManagedThreadId;
mydele.BeginInvoke("2", Callbacs, null);
Thread.Sleep(1000);
this.textBox1.Text = "call back之前";
var s3s = Thread.CurrentThread.ManagedThreadId;
}