Response.Redirect使用~Path

Question

I have a method that where I want to redirect the user back to a login page located at the root of my web application.

I'm using the following code:

Response.Redirect("~/Login.aspx?ReturnPath=" + Request.Url.ToString());

This doesn't work though. My assumption was that ASP.NET would automatically resolve the URL into the correct path. Normally, I would just use

Response.Redirect("../Login.aspx?ReturnPath=" + Request.Url.ToString());

but this code is on a master page, and can be executed from any folder level. How do I get around this issue?

Answer 1

I think you need to drop the "~/" and replace it with just "/", I believe / is the root

STOP RIGHT THERE! :-) unless you want to hardcode your web app so that it can only be installed at the root of a web site.

"~/" is the correct thing to use, but the reason that your original code didn't work as expected is that ResolveUrl (which is used internally by Redirect ) tries to first work out if the path you are passing it is an absolute URL (eg "** http://server/ **foo/bar.htm" as opposed to "foo/bar.htm") - but unfortunately it does this by simply looking for a colon character ':' in the URL you give it. But in this case it finds a colon in the URL you give in the ReturnPath query string value, which fools it - therefore your '~/' doesn't get resolved.

The fix is that you should be URL-encoding the ReturnPath value which escapes the problematic ':' along with any other special characters.

Response.Redirect("~/Login.aspx?ReturnPath=" + Server.UrlEncode(Request.Url.ToString()));

Additionally, I recommend that you (or anyone) never use Uri.ToString - because it gives a human-readable, more "friendly" version of the URL - not a necessarily correct one (it unescapes things). Instead use Uri.AbsoluteUri - like so:

Response.Redirect("~/Login.aspx?ReturnPath=" + Server.UrlEncode(Request.Url.AbsoluteUri));

Answer 2

您可以先解析URL Response.Redirect（“〜/ Login.aspx）;并在解析后添加参数。

Answer 3

怎么样使用

Response.Redirect(String.Format("http://{0}/Login.aspx?ReturnPath={1}", Request.ServerVariables["SERVER_NAME"], Request.Url.ToString()));