Pass a value from aspx to ascx

问题

I have a web page and it contains an user control inside of it. I have a property on the aspx page which gets set in the pageinit method and I need to that propery on ascx page. How can I get it?

回答1:

Create a public property inside the ascx and set it at the same time you set in the aspx page.

Just to let you know, PreInit is a EventHandler not a method.

回答2:

MyAdminPage myPageInstance = this.Parent as MyAdminPage;
if(myPageInstance != null)
{
...
}

There has been a few questions on this.

Reference .aspx property from .ascx

回答3:

The easiest options are as follows:

1. Use a public variable and access it from the parent page.
2. Assign the variable to a hidden field on the ascx front end. A field like this: <asp:HiddenField ID="ascxField" runat="server" /> .

The example below is for #1, but #2 is almost the same.

Example #1:

Aspx page:

Front end:

<%@ Register TagPrefix="Admin" TagName="MyUserControl" Src="~/UserControls/.../MyUserControl" %>

...

<Admin:MyUserControl ID="MyUserControl" AutoPostBack="true" runat="server" Visible ="false" />   

Code Behind:

 this.MyUserControl.Variable1 = 1;
 this.MyUserControl.Variable2= "value";

Ascx page:

Code Behind

public int Variable1 { get; set; }
public string Variable2 { get; set; }

来源：https://stackoverflow.com/questions/10657491/pass-a-value-from-aspx-to-ascx