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下面是使用的代码。“第 44 行”是问题区域：

var groups = p.GetAuthorizationGroups();

Index was outside the bounds of the array在正常运行大约一天后，它给了我一个错误。最后一点似乎是这种情况的真正鼻屎。我发现了很多其他GetAuthorizationGroups抛出越界错误的已解决问题，但我找不到任何关于最有效的系统的解决方案。

任何和所有的帮助将不胜感激。我会尽我所能纠正这个帖子的任何问题。

编辑：目前清除错误的唯一方法是重新启动网络服务器。简单地重新启动 IIS 并不能解决问题。

public override String[] GetRolesForUser(String username)
{
    //Check to see if role are already cached in Session variable
    if ((string[])System.Web.HttpContext.Current.Session["Roles"] == null)
    {
        //Create an ArrayList to store our resultant list of groups.
        ArrayList results = new ArrayList();
        //PrincipalContext encapsulates the server or domain against which all operations are performed.
        using (PrincipalContext context = new PrincipalContext(ContextType.Domain, null, "blargh.com"))
        {
            try
            {
                //Create a referance to the user account we are querying against.
                UserPrincipal p = UserPrincipal.FindByIdentity(context, IdentityType.SamAccountName, username);
                //Get the user's security groups.  This is necessary to
                //return nested groups, but will NOT return distribution groups.
                var groups = p.GetAuthorizationGroups();
                foreach (GroupPrincipal group in groups)
                {
                    results.Add(group.SamAccountName);
                }
            }
            catch (Exception ex)
            {
                throw new ProviderException("Unable to query Active Directory.", ex);
            }
        }
        // Store roles in Session for caching
        System.Web.HttpContext.Current.Session["Roles"] = results.ToArray(typeof(String)) as String[];
    }
    return (string[])System.Web.HttpContext.Current.Session["Roles"];
}
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