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  1. PO
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    <p>This solution is really slow, and when for example when you are using this in a webapplication GetAuthorizationGroups gets called very often which makes the site very slow. I worked implemented som caching instead, that makes alot faster after the first time. I am also retrying, because the exception still occurs.</p> <p>First i override the GetRolesForUser method and implement the caching.</p> <pre><code> public override string[] GetRolesForUser(string username) { // List of Windows groups for the given user. string[] roles; // Create a key for the requested user. string cacheKey = username + ":" + ApplicationName; // Get the cache for the current HTTP request. Cache cache = HttpContext.Current.Cache; // Attempt to fetch the list of roles from the cache. roles = cache[cacheKey] as string[]; // If the list is not in the cache we will need to request it. if (null == roles) { // Allow the base implementation to load the list of roles. roles = GetRolesFromActiveDirectory(username); // Add the resulting list to the cache. cache.Insert(cacheKey, roles, null, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration); } // Return the resulting list of roles. return roles; } </code></pre> <p>The GetRolesFromActiveDirectory looks like this.</p> <pre><code> public String[] GetRolesFromActiveDirectory(String username) { // If SQL Caching is enabled, try to pull a cached value.);)); if (_EnableSqlCache) { String CachedValue; CachedValue = GetCacheItem('U', username); if (CachedValue != "*NotCached") { return CachedValue.Split(','); } } ArrayList results = new ArrayList(); using (PrincipalContext context = new PrincipalContext(ContextType.Domain, null, _DomainDN)) { try { UserPrincipal p = UserPrincipal.FindByIdentity(context, IdentityType.SamAccountName, username); var tries = 0; var groups = GetAuthorizationGroups(p, tries); foreach (GroupPrincipal group in groups) { if (!_GroupsToIgnore.Contains(group.SamAccountName)) { if (_IsAdditiveGroupMode) { if (_GroupsToUse.Contains(group.SamAccountName)) { results.Add(group.SamAccountName); } } else { results.Add(group.SamAccountName); } } } } catch (Exception ex) { throw new ProviderException("Unable to query Active Directory.", ex); } } // If SQL Caching is enabled, send value to cache if (_EnableSqlCache) { SetCacheItem('U', username, ArrayListToCSString(results)); } return results.ToArray(typeof(String)) as String[]; } </code></pre> <p>The last method is GetAuthorizationGroups and it looks like this.</p> <pre><code> private PrincipalSearchResult&lt;Principal&gt; GetAuthorizationGroups(UserPrincipal userPrincipal, int tries) { try { return userPrincipal.GetAuthorizationGroups(); } catch(FileNotFoundException ex) { if (tries &gt; 5) throw; tries++; Thread.Sleep(1000); return GetAuthorizationGroups(userPrincipal, tries); } catch (AppDomainUnloadedException ex) { if (tries &gt; 5) throw; tries++; Thread.Sleep(1000); return GetAuthorizationGroups(userPrincipal, tries); } } </code></pre> <p>I found out that caching the roles makes it a whole lot faster. Hope this helps someone. Cheers.</p>
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    1. POAttempted to access an unloaded appdomain when using System.DirectoryServices
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    1. USnoshitsherlock
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    1. COI am not sure why you are down voted. Does anyone care to explain? I think this is more reasonable work around.
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      1. USReza
 

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