更快的方法来找出用户是否存在的系统上？ [英] Faster way to find out if a user exists on a system?

问题描述

我有一个检查，看看用户是否存在（如果不创建它）在每次启动时的应用程序。这样做是如下：

I have an application that checks to see if a user exists (if not create it) every time it starts. This is done as follows:

bool bUserExists = false;
DirectoryEntry dirEntryLocalMachine = 
    new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");

DirectoryEntries dirEntries = dirEntryLocalMachine.Children;

foreach (DirectoryEntry dirEntryUser in dirEntries)
{
    bUserExists = dirEntryUser.Name.Equals("UserName", 
        StringComparison.CurrentCultureIgnoreCase);

    if (bUserExists)
      break;
}

的问题是对大多数在那里被部署在系统。这可能需要6 - 10秒钟，这是太长了......我需要找到一种方式来减少这种（尽可能）。是否有一个的好或更快的办法，我可以用它来验证用户是否在系统上存在与否？

The problem is on the majority of the systems where it is deployed. This can take 6 - 10 seconds, which is too long ... I need to find a way to reduce this (as much as possible). Is there a better or faster way I can use to verify if a user exists on the system or not?

我知道有其他的方法来解决这个问题，好像有其他应用程序休眠10秒，拥有这个工具，发送邮件时，它已准备好，等...但是如果我可以大大减少花费的时间找到用户，这将让我的生活变得更加容易。

I know there are other ways to solve this, like have the other applications sleep for 10 seconds, or have this tool send a message when it is ready, etc... But if I can greatly reduce the time it takes to find the user, it would make my life much easier.

推荐答案

.NET 3.5支持新的 AD 的System.DirectoryServices.AccountManagement命名空间下查询类。

.NET 3.5 supports new AD querying classes under the System.DirectoryServices.AccountManagement namespace.

要使用它，你需要添加System.DirectoryServices.AccountManagement作为参考，并添加使用语句。

To make use of it, you'll need to add "System.DirectoryServices.AccountManagement" as a reference AND add the using statement.

using System.DirectoryServices.AccountManagement;


using (PrincipalContext pc = new PrincipalContext(ContextType.Machine))
{
    UserPrincipal up = UserPrincipal.FindByIdentity(
        pc,
        IdentityType.SamAccountName,
        "UserName");

    bool UserExists = (up != null);
}

＆LT; .NET 3.5

有关.NET之前的3.5版本，这里是一个干净的例子，我发现的 DOTNET-片段​​

For versions of .NET prior to 3.5, here is a clean example I found on dotnet-snippets

DirectoryEntry dirEntryLocalMachine =
    new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");

bool UserExists =
    dirEntryLocalMachine.Children.Find(userIdentity, "user") != null;

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