您重新创建所有你的每一个回发动态控件？

记住每次回发是Page类，你pviously创建需要$ P $显式地重新创建任何控件的新实例。

Remember each postback is a new instance of the Page class and any controls you previously created will need to be explicitly re-created.

更新

如果你不得不在ViewState中添加的项目列表，像这样..

If you had a list of added items in viewstate, something like this..

    private List<string> Items
    {
         get
         {
              return ViewState["Items"] = (ViewState["Items"] ?? new List<string>());
         }
    }

然后在你的单击处理程序，你可以简单地添加到这个列表：

Then in your click handler you could simply add to this list :

   private void btn_Click(object sender, EventArgs e)
   {
        this.Items.Add("Another Item");
   }

然后重写的CreateChildControls

  protected overrides CreateChildControls()
  {
       foreach (string item in this.Items)
       {
            Passanger p = new Passenger();
            p.Something = item;
            this.p_passengers.Controls.Add(p);
       }
  }