asp.net c#membership:如何做一个GetUsersInRoles(多个角色)H

Question

我想做一个"GetUsersInRoles",即我想找到所有MembershipUser在一组角色中至少有一个角色,但我似乎无法理解这个角色.

我有GetUsersInRole,Membership.GetAllUsers(),Linq,......但是怎么样？

任何反馈都非常感谢

汤米

Answer 1

这是一个Linq版本,它返回一个MembershipUserCollection类似的Membership方法(FindUsersByEmail,FindUsersByName).它不是很漂亮,因为它依赖于ForEach的副作用:

    public static MembershipUserCollection FindUsersByRole(string[] roles)
    {
        MembershipUserCollection msc = new MembershipUserCollection();

        roles.Select(role => Roles.GetUsersInRole(role))
        .Aggregate((a, b) => a.Union(b).ToArray())
        .Distinct()
        .Select( user => Membership.GetUser(user))
        .ToList().ForEach( user => msc.Add(user));

        return msc;
    }

或者,如果MembershipUser列表将执行:

    public static List<MembershipUser> FindUsersByRole(string[] roles)
    {
        var userList = roles.Select(role => Roles.GetUsersInRole(role))
                            .Aggregate((a, b) => a.Union(b).ToArray())
                            .Distinct()
                            .Select( user => Membership.GetUser(user))
                            .ToList();
        return userList;
    }  

最后,如果您只需要用户名,则可以跳过一个选择:

    public static List<string> FindUsersByRole(string[] roles)
    {
        var userList = roles.Select(role => Roles.GetUsersInRole(role))
                            .Aggregate((a, b) => a.Union(b).ToArray())
                            .Distinct()
                            .ToList();
        return userList;
    }