blocks|key|243834|text|这是网站项目，还是web应用程序项目。对于后者，引用是通过.csproj处理的--即通过解决方案资源管理器中的“引用”节点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|243835|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Is this a web site project, or a web application project. With the latter, references are handled via the .csproj - i.e. via the "References" node in Solution Explorer.

blocks|key|243837|text|在黑暗中拍摄:您是否尝试添加到web.config中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|243838|<compilation+debug="true">
+++++<assemblies>
++++++++++<add+assembly="System.DirectoryServices,+Version=2.0.0.0,+Culture=neutral,+PublicKeyToken=B03F5F7F11D50A3A"/>
+++++</assemblies>
</compilation>|code-block|syntax|javascript|243839|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Shot in the dark: have you tried adding to the web.config:

<pre class="lang-xml prettyprint-override"><code>&lt;compilation debug="true"&gt;
 &lt;assemblies&gt;
 &lt;add assembly="System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/&gt;
 &lt;/assemblies&gt;
&lt;/compilation&gt;
</code></pre>

blocks|key|242214|text|web服务器(IIS或其他什么)是否配置为将文件夹作为应用程序运行(即显示为cog)，它是否使用了正确的ASP.NET版本？如果它作为1.1运行，那么它的一些部分可能会工作--但是它将无法在1.1GAC中找到那个2.0程序集。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|242215|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Is the web-server (IIS or whatever) configured to run the folder as an application (i.e. shows as a cog), and is it using the correct version of ASP.NET? If it is running as 1.1, bits of it might work - but it would fail to find that 2.0 assembly in the 1.1 GAC.

blocks|key|242217|text|这是一个非常古老的线索，但只是为了子孙后代提供一个完整的答案;)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|242218|如果项目缺少对System.DirectoryServices组件.Net的引用，则会发生此问题。|offset|length|style|BOLD|242219|以您喜欢的方式添加此引用将解决此问题。|242220|entityMap^0|0|7|O|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

This is a very old thread but just to provide a complete answer for the sake of posterity ;)

This issue occurs if the project is missing a reference to the .Net Component System.DirectoryServices

Adding this reference in the usual manner prefered by you will resolve the issue.

blocks|key|242225|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|242226|右键单击解决方案下的引用。|ordered-list-item|242227|选择添加引用。该引用可在框架程序集列表中找到。选择System.DirectoryServices并单击Add.|242228|242229|entityMap^0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|I|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|J|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|K|7|@]|8|@]|9|$]]|$1|F|3|-4|4|5|6|L|7|@]|8|@]|9|$]]|$1|G|3|-4|4|5|6|M|7|@]|8|@]|9|$]]]|H|$]]

<ol>
<li>Right click on References under your solution. </li>
<li>Select Add Reference.
The reference can be found under the Framework Assemblies list.
Select System.DirectoryServices and click Add.</li>
</ol>

blocks|key|364817|text|在解决方案资源管理器上右键单击项目，然后从结果菜单中单击Add+Reference，然后在.NET选项卡下导航到DirectoryServices.AccountManagement|type|unstyled|depth|inlineStyleRanges|entityRanges|data|364818|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

On Solution Explorer right-click your project, then from the resulting menu, click on Add Reference, then under the .NET tab navigate to DirectoryServices.AccountManagement

blocks|key|364826|text|当我试图将网站转换为web应用程序时，我也遇到了同样的问题。看起来，vs未能加载程序集应该与版本控制有关。切换到web.config，并按下面的方式将程序集添加到其中。确保DLL版本与您的应用程序目标.NET版本匹配。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|364827|<configuration>
++<system.web>
++++<compilation+debug="true"+targetFramework="4.0">
++++++<assemblies>
++++++++<add+assembly="System.DirectoryServices,+Version=4.0.0.0,+Culture=neutral,+PublicKeyToken=b03f5f7f11d50a3a"/>
++++++</assemblies>
++++</compilation>
++</system.web>
</configuration>|code-block|syntax|javascript|364828|为了获得公钥，您需要启动Developer+Command+Prompt+for+VS。在上面的ex+C:\Windows\Microsoft.NET\Framework\v4.0.30319和call上切换到GAC目录相关框架|364829|sn+-T+System.DirectoryServices.dll|364830|entityMap^0|1K|A|0|0|C|V|1F|19|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

I had the same problem when I tried to convert website to web-app.
It looks like vs failing to load the assembly should be related to versioning.
switch to <code>web.config</code> and add the assembly to it as bellow. make sure the DLL version is matching your application targeted .NET version.

<pre class="lang-xml prettyprint-override"><code>&lt;configuration&gt;
 &lt;system.web&gt;
 &lt;compilation debug="true" targetFramework="4.0"&gt;
 &lt;assemblies&gt;
 &lt;add assembly="System.DirectoryServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/&gt;
 &lt;/assemblies&gt;
 &lt;/compilation&gt;
 &lt;/system.web&gt;
&lt;/configuration&gt;
</code></pre>

for getting a public key you need to launch <code>Developer Command Prompt for VS</code>. Change to GAC directory related framework on above ex <code>C:\Windows\Microsoft.NET\Framework\v4.0.30319</code>
and call 

<pre><code>sn -T System.DirectoryServices.dll
</code></pre>

blocks|key|364841|text|当您使用旧版本的.net版本并试图使用最新的IDE构建时，就会出现这些问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|364842|这取决于您正在使用的IDE的哪个版本以及当前的代码版本。|364843|检查web配置，|364844|在我的例子中，我使用的是最新的版本I.4.7，而directoryService程序集仍然是指C#4.0。|offset|length|style|CODE|364845|如果您使用的是最新版本的id+i.4.7，请添加以下内容|364846|++<system.web>
++<location>

<compilation+debug="false"+numRecompilesBeforeAppRestart="100"+targetFramework="4.7">
++++++++<assemblies>
<add+assembly="System.DirectoryServices,+Version=4.0.0.0,+Culture=neutral,+PublicKeyToken=B03F5F7F11D50A3A"+/>
<add+assembly="System.DirectoryServices.AccountManagement,+Version=4.0.0.0,+Culture=neutral,+PublicKeyToken=B77A5C561934E089"+/>
+</assemblies>
++++++</compilation>
</system.web>
++</location>|code-block|syntax|javascript|364847|entityMap^0|0|0|0|O|G|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|X|8|@$H|Y|I|Z|J|K]]|9|@]|A|$]]|$1|L|3|M|5|6|7|10|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|11|8|@]|9|@]|A|$Q|R]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

These problems occur when you are working with older .net version and trying to build with the latest IDE 

It depends on which version of IDE you are using and also the current code version.

Check the web config,

In my case, I was using the Latest version i.e 4.7 and <code>directoryService</code> assembly are still referring to C#4.0.

Add below if you are using Latest version of id i.e 4.7

<pre><code> &lt;system.web&gt;
 &lt;location&gt;

&lt;compilation debug="false" numRecompilesBeforeAppRestart="100" targetFramework="4.7"&gt;
 &lt;assemblies&gt;
&lt;add assembly="System.DirectoryServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" /&gt;
&lt;add assembly="System.DirectoryServices.AccountManagement, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" /&gt;
 &lt;/assemblies&gt;
 &lt;/compilation&gt;
&lt;/system.web&gt;
 &lt;/location&gt;
</code></pre>

I'm trying to use <code>System.DirectoryServices</code> in a web site project and I'm getting this error:

<blockquote>
 The type or namespace name 'DirectoryServices' does not exist in the namespace 'System' (are you missing an assembly reference?)
</blockquote>

My project has a reference to <code>System.DirectoryServices</code> in <code>web.config</code>: 

<pre><code>&lt;add assembly="System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/&gt; 
</code></pre>

And I do have <code>using System.DirectoryServices</code> in the files where I want to use it.

Does anybody have a clue where to look for the problem?

System.DirectoryServices is not recognised in the namespace 'System'

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我试图在一个网站项目中使用System.DirectoryServices，我得到了以下错误：名称空间'DirectoryServices‘中不存在类型或名称空间名称’DirectoryServices‘(您是否缺少程序集引用？)我的项目在web.config中引用了web.config：<add assembly="...

问System.DirectoryServices在命名空间“System”中未被识别
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问System.DirectoryServices在命名空间“System”中未被识别EN