在Asp.Net Membership中手动更改用户名

我可以通过直接访问asp.net成员资格用户表来更改用户名.但是,旧用户名保留在新行中,并由asp.net自动分配新的UserID.我如何阻止这种情况发生？

编辑：仅在users表和角色表中,而不是在成员资格表中.

var mUser = dc.aspnet_Users
            .Where(u => u.UserId == (Guid)user.ProviderUserKey)
            .Select(u => u).SingleOrDefault();

mUser.UserName = newName;
mUser.LoweredUserName = newName.ToLower();

try
{
    dc.SubmitChanges();
}
catch
{
    ...
}

解决方法

ASP.NET 2.0中的sql成员资格提供程序不支持更改用户名.您仍然可以更改用户名,但必须使用自定义实现.

此外,您必须使用新用户名更新成员资格cookie,以避免使用相同的用户名重新创建用户,但新的UserId.

在下面的示例中,我使用Linq to sql来更新成员资格表 – 我有名为MembershipDataContext的数据上下文.

public bool ChangeUserName(Guid userId,string newUserName)
{
    bool success = false;
    newUserName = newUserName.Trim();

    // Make sure there is no user with the new username
    if (Membership.GetUser(newUserName) == null)
    {
        MembershipUser u = Membership.GetUser(userId);
        string oldUsername = u.UserName;
        // get current application

        MembershipDataContext context = new MembershipDataContext ();
        aspnet_User usertochange = (from user in context.aspnet_Users
                                    where user.UserId == userId
                                    select user).FirstOrDefault();

        if (usertochange != null)
        {
            usertochange.UserName = newUserName;
            usertochange.LoweredUserName = newUserName.ToLower();

            context.SubmitChanges();

            // ASP.NET Issues a cookie with the user name. 
            // When a request is made with the specified cookie,// ASP.NET creates a row in aspnet_users table.
            // To prevent this sign out the user and then sign it in

            string cookieName = FormsAuthentication.FormsCookieName;
            HttpCookie authCookie = 
              HttpContext.Current.Request.Cookies[cookieName];

            FormsAuthenticationTicket authTicket = null;

            try
            {
                authTicket = 
                    FormsAuthentication.Decrypt(authCookie.Value);

                FormsIdentity formsIdentity = 
                    new FormsIdentity(
                        new FormsAuthenticationTicket(
                            authTicket.Version,newUserName,authTicket.IssueDate,authTicket.Expiration,authTicket.IsPersistent,authTicket.UserData));

                string y = HttpContext.Current.User.Identity.Name;
                string[] roles = 
                    authTicket.UserData.Split(new char[] { '|' });
                System.Security.Principal.GenericPrincipal genericPrincipal = 
                    new System.Security.Principal.GenericPrincipal(
                                                        formsIdentity,roles);

                HttpContext.Current.User = genericPrincipal;
            }
            catch (ArgumentException ex)
            {
                // Handle exceptions
            }
            catch( NullReferenceException ex)
            {
                // Handle exceptions
            }

            FormsAuthentication.SignOut();
            HttpContext.Current.Session.Abandon();
            FormsAuthentication.SetAuthCookie(newUserName,false);
            success = true;
        }
    }

    return success;
}