C＃Asp.net Membership.GetAllUsers为了通过电子邮件 [英] C# Asp.net Membership.GetAllUsers order by email

问题描述

我使用Membership.GetAllUsers（）来获取我的用户列表。我想有列表中返回的电子邮件地址排序，因为我需要一些标志账户重复的电子邮件。

I am using Membership.GetAllUsers() to get my user list. I would like to have the list returned sorted by email address as I need to flag some accounts with duplicate emails.

Membership.GetAllUsers（），似乎由默认用户名订购。有没有办法来改变这种行为？

Membership.GetAllUsers() seems to order by username by default. Is there a way to change this behavior?

推荐答案

如果你可以用一个通用的清单，而不是活 MembershipUserCollection ：

If you can live with a generic list rather than a MembershipUserCollection:

Membership.GetAllUsers().Cast<MembershipUser>().OrderBy(x => x.Email).ToList();

使用的OrderBy（X =＆GT; x.Email，StringComparer.OrdinalIgnoreCase）。如果你想不区分大小写的排序的电子邮件地址

Use OrderBy(x => x.Email, StringComparer.OrdinalIgnoreCase) if you want a case-insensitive sort of the email address.

会员code实际上predates泛型（这是从.NET 1.1开发集成到.NET 2.0），因此 MembershipUserCollection 没有实现通用接口

Membership code actually predates generics (it was integrated into .NET 2.0 from a .NET 1.1 development), hence MembershipUserCollection does not implement generic interfaces.

前面的问题的，你可能有兴趣在其他LINQ风格的操作。例如，下面会给你一本字典，它的键是电子邮件地址（不区分大小写），其值是相应的的MembershipUser 对象，通过上次活动日期降序排序列表：

Given your earlier question, you may be interested in other LINQ-style manipulations. For example the following will give you a dictionary whose keys are email addresses (case-insensitive), and whose values are lists of corresponding MembershipUser objects, sorted by last activity date descending:

var dictionary = Membership.GetAllUsers().Cast<MembershipUser>()
    .GroupBy(x => x.Email, StringComparer.OrdinalIgnoreCase)
    .ToDictionary(
                  x => x.Key, 
                  x =>x.OrderByDescending(u => u.LastActivityDate).ToList()
                 );

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