windows 找出用户是否存在于系统上的更快方法？
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Faster way to find out if a user exists on a system?
提问by Shaitan00
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:
我有一个应用程序，每次启动时都会检查用户是否存在（如果没有创建）。这是按如下方式完成的：
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;
}
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 betteror fasterway I can use to verify if a user exists on the system or not?
问题出在部署它的大多数系统上。这可能需要 6 - 10 秒，太长了......我需要找到一种方法来减少这种情况（尽可能多）。有没有更好或更快的方法可以用来验证系统上是否存在用户？
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.
我知道还有其他方法可以解决这个问题，比如让其他应用程序休眠 10 秒，或者让这个工具在准备好时发送消息等等......但是如果我能大大减少找到用户所需的时间，这会让我的生活更轻松。
回答by Michael La Voie
.NET3.5 supports new ADquerying classes under the System.DirectoryServices.AccountManagementnamespace.
.NET3.5 支持命名空间下的新AD查询类System.DirectoryServices.AccountManagement。
To make use of it, you'll need to add "System.DirectoryServices.AccountManagement" as a reference AND add the usingstatement.
要使用它，您需要添加“System.DirectoryServices.AccountManagement”作为参考并添加using语句。
using System.DirectoryServices.AccountManagement;
using (PrincipalContext pc = new PrincipalContext(ContextType.Machine))
{
UserPrincipal up = UserPrincipal.FindByIdentity(
pc,
IdentityType.SamAccountName,
"UserName");
bool UserExists = (up != null);
}
< .NET 3.5
<.NET 3.5
For versions of .NET prior to 3.5, here is a clean example I found on dotnet-snippets
对于 3.5 之前的 .NET 版本，这是我在dotnet-snippets上找到的一个干净的示例
DirectoryEntry dirEntryLocalMachine =
new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");
bool UserExists =
dirEntryLocalMachine.Children.Find(userIdentity, "user") != null;
回答by Beached
You want to use the DirectorySearcher.
您想使用 DirectorySearcher。
Something like this:
像这样的东西：
static bool userexists( string strUserName ) {
string adsPath = string.Format( @"WinNT://{0}", System.Environment.MachineName );
using( DirectoryEntry de = new DirectoryEntry( adsPath ) ) {
try {
return de.Children.Find( strUserName ) != null;
} catch( Exception e ) {
return false;
}
}
}
That should be quicker. Also, you can reduce the properties if all you are doing is checking for existence.
那应该更快。此外，如果您所做的只是检查是否存在，则可以减少属性。
回答by kenny
The following in a command prompt returns 1 if 'username' exists.
如果“用户名”存在，则命令提示符中的以下内容将返回 1。
net user | find "username" /c
净用户 | 找到“用户名”/c
回答by mhu
This should do it (when you can't use System.DirectoryServices.AccountManagement):
这应该这样做（当您不能使用 System.DirectoryServices.AccountManagement 时）：
static bool userExists(string sUser)
{
using (var oUser = new DirectoryEntry("WinNT://" + Environment.MachineName + "/" + sUser + ",user"))
{
return (oUser != null);
}
}
