public partial class Async : System.Web.UI.Page
{
public delegate string MyDelegate();
protected void Page_Load(object sender, EventArgs e)
{
MyDelegate name = GetName;
var r = name.BeginInvoke(new AsyncCallback(Done), null);
this.Label1.Text = "111";
}
private void Done(IAsyncResult result)
{
MyDelegate aa = (MyDelegate)result.AsyncState;
var s = aa.EndInvoke(result);
this.Label2.Text = s;
}
private string GetName()
{
return "111";
}
}
为什么result.AsyncState 是null