我可以调用用户控件的Page_Load事件aspx页面的Page_Load事件之前？ [英] Can I call page_load event of usercontrol before page_load event of aspx page?
问题描述
问题是直forward.Can我叫用户控件的Page_Load中aspx页面的Page_Load中过吗？
The question is straight forward.Can I call page_load of usercontrol before page_load of aspx page?
修改的
EDIT
的它无法调用父母的Page_Load之前，孩子的Page_Load事件。的
我有这种所谓的just4test测试puropse的aspx类。
它的ASPX code是：
I have this aspx class called just4test for testing puropse. Its aspx code is:
<body>
<form id="form1" runat="server">
<uc1:lcont ID="lcont1" runat="server" />
<div>
</div>
</form>
你可以它使用的是用户控件文件中看到。
As you can see it is using a usercontrol file.
和其code后面的是：
And its code behind is :
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
lcont1.my_tv_SelectedNodeChanged(sender, e);
}
}
现在的用户控件是：
public partial class lcont : System.Web.UI.UserControl
{
sql_con sq = new sql_con();
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
bind_data();
}
}
public void mytry()
{
Console.WriteLine("helo");
}
public void bind_data()
{
main_cat mcobj = new main_cat();
List<main_cat> mclist = new List<main_cat>();
mclist = mcobj.get_mcatlist();
populatetree(mclist);
}
public void populatetree(List<main_cat> mytnode)
{
TreeNode parentnode = null;
foreach (main_cat mc in mytnode)
{
parentnode = new TreeNode(mc.Cname, mc.Cid.ToString());
foreach (sub_cat sc in mc.scl)
{
TreeNode cnode = new TreeNode(sc.PRODUCT, sc.SID.ToString());
parentnode.ChildNodes.Add(cnode);
}
parentnode.Collapse();
my_tv.Nodes.Add(parentnode);
}
}
public void my_tv_SelectedNodeChanged(object sender, EventArgs e)
{
TreeView tv = sender as TreeView;
//TreeView tv = new TreeView();
var selectedN = tv.SelectedNode;
if (selectedN.Parent != null)
{
var id = tv.SelectedNode.Value;
var name = tv.SelectedNode.Text;
//Session["mySvar"] = id;
ScriptManager.RegisterStartupScript(this, this.GetType(), "nething", "show("+id+")", true);
}
else
{
//Response.Redirect("test.aspx");
}
}
}
我需要调用的函数my_tv_SelectedNodeChanged（发件人，E）; just4test页面的Page_Load之前用户控件和我做so.But当我运行它表示，该计划
I need to call the function my_tv_SelectedNodeChanged(sender, e); of usercontrol before the page_load of just4test page and i have done so.But when i run the program it says
对象引用未设置到对象的实例。
Object reference not set to an instance of an object.
我应该怎么办？
推荐答案
Page_Load中没有，但之前的OnInit occures。取决于你的实际问题，你可以有你的移动逻辑。
Page_Load no, but OnInit occures before. Depends on your actual problem, you can move your logic there.
或者呼叫的用户控制的公共方法您在父页Page_Load事件做任何事情之前
Or call a public method of the User control before you do anything else in the Parent Page Page_Load event
请参阅页生命周期
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