如何将查询字符串中的参数传递给多个页面？

Question

I want to change my site (consists of multiple pages) theme dynamically. I pass a parameter in a querystring as "theme" to all the solution. It works just for one page that is redirected with query string (It's theme changes correctly), but other webforms' theme don't change.

so how can I pass a parameter in a querystring to multiple pages?

the below code is an Event that when user click the button, redirect him to other page and change the theme of sit.

protected void btn_blue_gray_Click(object sender, EventArgs e)
        {
            String bl = "blue";
            Response.Redirect("page1.aspx?theme=" + bl);
        }

if it helps: it's asp.net 4.5 and we used Microsoft.AspNet.Identity package for login User.

Answer 1

When you navigate to other pages you lose the query string passed in unless you add it to the route/links to other pages yourself.

When you pass a parameter to your page (assuming you login you can do it there) store the theme choice in a bit of state (cookie or session or MemoryCache or something) then just look for this value on each page (or stick it into a MasterPage or baseView with the default being your standard theme value.

something like

return Session["theme"] ?? "default";

Then every page derived from that MasterPage or View will have access to the theme value (regardless of where you set it).

If you want to allow the user to change the value then set it behind your button click and then navigate or refresh the page and the new theme value will be picked up automatically.

Answer 2

You would need to set the theme in a global class, which all web forms can access.

public static class Theme { public static string theme = ""; }