Monday, December 7, 2009

Anti-Sample Of The Day - Request.ApplicationPath +"/mypath"

Imagine the following 3 alternatives of setting link URI:

<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="~/foobar.txt" Text="asp:HyperLink ~foobar.txt"/><br/>
<asp:HyperLink ID="HyperLink2" runat="server" NavigateUrl="" Text="HyperLink2.NavigateUrl = Request.ApplicationPath + '/foobar.txt';"/><br/>
<a href="<%=Request.ApplicationPath+"/foobar.txt"%>">Request.ApplicationPath+"/foobar.txt"</a>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
HyperLink2.NavigateUrl = Request.ApplicationPath + "/foobar.txt";

Run under /sample application (seems fine):

Run under / (breaks links 2,3):

Source: MSDN, search for ApplicationPath samples. Or one is located directly under ApplicationPath docs:
with small excuse in Remarks section
Use this property to construct a URL relative to the application root from a page or Web user control that is not in the root directory.
BTW: In "equivalent Servlet API" getContextPath()" they have made decision elminating this sort of concat mistake:
The path starts with a "/" character but does not end with a "/" character. For servlets in the default (root) context, this method returns "".

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