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    <p>For now I've gone with a solution that scrubs the cookie if the exception is thrown. If the exception is thrown again I'll just let it happen as it was. </p> <p>I won't mark this as 'the' answer for now in the hope that someone has a better answer.</p> <pre><code>public static class MyAntiForgeryExtensions { // Methods public static string MyAntiForgeryToken(this HtmlHelper helper) { return MyAntiForgeryToken(helper, null); } public static string MyAntiForgeryToken(this HtmlHelper helper, string salt) { string fragment; string path = helper.ViewContext.HttpContext.Request.ApplicationPath; try { fragment = helper.AntiForgeryToken(salt, null, path); } catch (HttpAntiForgeryException) { // okay, scrub the cookie and have another go. string cookieName = GetAntiForgeryTokenName(path); helper.ViewContext.HttpContext.Request.Cookies.Remove(cookieName); fragment = helper.AntiForgeryToken(salt, null, path); } return fragment; } #region AntiForgeryData code that shouldn't be sealed // Copied from AntiForgeryData since they aren't accessible. internal static string GetAntiForgeryTokenName(string appPath) { if (String.IsNullOrEmpty(appPath)) { return "__RequestVerificationToken"; } else { return "__RequestVerificationToken_" + Base64EncodeForCookieName(appPath); } } private static string Base64EncodeForCookieName(string s) { byte[] rawBytes = Encoding.UTF8.GetBytes(s); string base64String = Convert.ToBase64String(rawBytes); // replace base64-specific characters with characters that are safe for a cookie name return base64String.Replace('+', '.').Replace('/', '-').Replace('=', '_'); } #endregion } </code></pre>
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    1. POHow do I solve an AntiForgeryToken exception that occurs after an iisreset in my ASP.Net MVC app?
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    1. USColin Newell
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    1. COI did the same thing. I think this is a big design flaw with the `AntiForgeryToken` method, and like your comments suggest, it's even more frustrating that the MVC code is internal/sealed, because it prevents us from easily fixing it!
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      1. USScott Rippey
    2. COOn a related note, it's also frustrating that the `ValidateAntiForgeryToken` attribute is sealed, because it has a few shortcomings too. I actually ended up grabbing the VAFT source, un-sealing it, and creating my own subclass that can be applied to an entire Controller and supports JSON requests.
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      1. USScott Rippey
    3. COone thing I would change for MVC3 support is that your static helper extension methods should return MvcHtmlString, because helper.AntiForgeryToken(string, string, string) returns that type instead of a plain string.
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      1. USThiago Silva
 

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