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Asked: 2026-06-12T15:50:13+00:00

I recently detected, that UrlHelper.IsLocalUrl method always returns false , if it detects non-ASCII

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I recently detected, that UrlHelper.IsLocalUrl method always returns false, if it detects non-ASCII characters in the url parameter.

Example:

var isLocal = UrlHelper.IsLocalUrl("контакты"); //false

Is it a bug, or “by design”?

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  1. Editorial Team

    The latest available implementation is checking for those conditions:

    • the url starts with "/" and is not followed by "/" or "\"
    • or the url starts with "~" and is followed by "/"

    Thus all the urls passed to this method must start with "/" or "~/".

    Also, in case you wonder, it doesn’t take the current host into account and check for schemes like http for instance.

    Update:
    Here is a link to the implementation which is used by UrlHelper.IsLocalUrl
    http://aspnetwebstack.codeplex.com/SourceControl/changeset/view/600963a4df15#src/System.Web.WebPages/RequestExtensions.cs

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