System.Web.MimeMapping static constructor crash due to incorrect string comparer use - by geraint_e

Status : 

  Duplicate<br /><br />
		This item appears to be a duplicate of another existing Connect or internal item.<br /><br />
		A more detailed explanation for the resolution of this particular item may have been provided in the comments section.

Sign in
to vote
ID 661862 Comments
Status Closed Workarounds
Type Bug Repros 2
Opened 4/15/2011 2:05:41 AM
Access Restriction Public


the static constructor of System.Web.MimeMapping crashes when adding standard MIME types to a Hashtable.

Looking at the reflected code in that class, it's adding MIME types to a hashtable using a culture-specific string comparer:

static MimeMapping()
    _extensionToMimeMappingTable = new Hashtable(190, StringComparer.CurrentCultureIgnoreCase);
    AddMimeMapping(".323", "text/h323");
    AddMimeMapping(".asx", "video/x-ms-asf");

The bug is that the MimeMapping static constructor should be using an _InvariantCulture_ string comparer when adding these types into the HashTable.

In culture cy-gb, G and F are considered to be equal (this is another bug, but never mind!). So when it comes to adding in the .GIF type, it complains that the item already exists - because .FIF is already in the hashtable. This is some code which may help clarify the comparisons:

StringComparer.CurrentCultureIgnoreCase.Equals(".g", ".f")
StringComparer.CurrentCultureIgnoreCase.Equals(".gif", ".fif")
StringComparer.CurrentCultureIgnoreCase.Equals(".gif", ".fig")
StringComparer.CurrentCultureIgnoreCase.Equals(".g", ".h")

Sign in to post a comment.
Posted by Scott [MSFT] on 4/18/2011 at 10:46 PM
This was a duplicate of another issue.
Posted by Macy [MSFT] on 4/18/2011 at 2:41 AM
Thanks for your feedback.

We are rerouting this issue to the appropriate group within the Visual Studio Product Team for triage and resolution. These specialized experts will follow-up with your issue.
Posted by eddieyanez on 4/15/2011 at 2:26 AM
This looks the same as
Posted by Microsoft on 4/15/2011 at 2:13 AM
Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(