blocks|key|3342159|text|它是放置嵌入式数据库的地方，例如Sql+Server+Express、Access或SQLite。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3342160|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|$]]

It's a place to put an embedded database, such as Sql Server Express, Access, or SQLite.

blocks|key|350715|text|App_data的预期用途是存储应用程序数据，以供web进程访问。它不应该是web可见的，而是web应用程序存储和读取数据的地方。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|350716|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|$]]

The intended use of App_data is to store application data for the web process to acess. It should not be viewable by the web and is a place for the web app to store and read data from.

blocks|key|3129238|text|其主要目的是将应用程序的数据库文件保存在。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3129239|默认情况下，这将不能从web访问。|3129240|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The main intention is for keeping your application's database file(s) in.

And no this will not be accessable from the web by default.

blocks|key|349681|text|App_Data本质上是基于文件的数据存储的存储点(例如，与SQL+server数据库存储相对)。例如，一些简单的站点将其用于存储为XML的内容，通常情况下，托管数据库的费用很高。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|349682|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|$]]

App_Data is essentially a storage point for file-based data stores (as opposed to a SQL server database store for example). Some simple sites make use of it for content stored as XML for example, typically where hosting charges for a DB are expensive.

blocks|key|348351|text|App_Data的预期用途是存储与数据库相关的文件。通常是SQL+Server+Express+.mdf文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|348352|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|$]]

The intended use for App_Data is to store database related file. Usually SQL Server Express .mdf files.

blocks|key|3342238|text|App_Data文件夹是一个文件夹，您的asp.net工作进程也有文件系统权限，但不是通过web服务器发布的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3342239|例如，我们使用它来更新“联系我们”表单的本地CSV。如果首选的电子邮件方法失败或需要查询数据源，App_Data文件就在那里。|3342240|这并不理想，但它是一个很好的后备方案。|3342241|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

The App_Data folder is a folder, which your asp.net worker process has files sytem rights too, but isn't published through the web server.

For example we use it to update a local CSV of a contact us form. If the preferred method of emails fails or any querying of the data source is required, the App_Data files are there.

It's not ideal, but it it's a good fall-back.

blocks|key|3129278|text|我们将其用作上传的csv文件的临时存储区。上传文件后，ajax方法将处理并删除该文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3129279|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|$]]

We use it as a temporary storage area for uploaded csv files. Once uploaded, an ajax method processes and deletes the file.

blocks|key|3129362|text|在IIS中，突出显示机器，双击“请求过滤”，打开“隐藏段”选项卡。"App_Data“被列为受限制的文件夹。是的，我知道这个帖子真的很旧，但它仍然适用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3129363|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|$]]

in IIS, highlight the machine, double-click "Request Filtering", open the "Hidden Segments" tab. "App_Data" is listed there as a restricted folder. Yes i know this thread is really old, but this is still applicable.

blocks|key|3342373|text|来自MSDN中关于的文档：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3342374|3342375|您可以将Web项目的文件保存在任何对应用程序方便的文件夹结构中。为了使您的应用程序更容易使用，ASP.NET保留了某些文件名和文件夹名，您可以将这些文件名和文件夹名称用于特定类型的内容。|blockquote|3342376|3342377|App_Data包含应用程序数据文件，包括.mdf数据库文件、XML文件和其他数据存储文件。ASP.NET使用App_Data文件夹来存储应用程序的本地数据库，例如用于维护成员资格和角色信息的数据库。有关更多信息，请参见Introduction+to+Membership和Understanding+Role+Management。|offset|length|style|BOLD|3342378|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/yh26yfzy(v=vs.100).aspx|1|http://msdn.microsoft.com/en-us/library/5k850zwb(v=vs.100).aspx)^0|0|0|0|0|0|8|32|Q|0|3T|T|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Y|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@$I|13|J|14|1|15]|$I|16|J|17|1|18]]|A|$]]|$1|M|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]|U|$5|P|Q|R|A|$S|V]]]]

From the documentation about <a href="http://msdn.microsoft.com/en-us/library/ex526337%28v=vs.100%29.aspx" rel="nofollow noreferrer">ASP.NET Web Project Folder Structure</a> in MSDN:

<blockquote>
 You can keep your Web project's files in any folder structure that is
 convenient for your application. To make it easier to work with your
 application, ASP.NET reserves certain file and folder names that you
 can use for specific types of content.
 
 App_Data contains application data files including .mdf database files, XML files, and other data store files. The App_Data folder is
 used by ASP.NET to store an application's local database, such as the
 database for maintaining membership and role information. For more information, see <a href="http://msdn.microsoft.com/en-us/library/yh26yfzy(v=vs.100).aspx" rel="nofollow noreferrer">Introduction to Membership</a> and <a href="http://msdn.microsoft.com/en-us/library/5k850zwb(v=vs.100).aspx" rel="nofollow noreferrer">Understanding Role Management</a>.
</blockquote>

When creating a new ASP.NET application in Visual Studio, a couple of files and folders are created automatically. One of those folders is called <code>App_Data</code>.

Also when publishing a website by selecting the menu option <code>Build-&gt;Publish</code> a checkbox is available <code>Include files from the App_Data folder</code>.

Am I right assuming that the files put in this file and its sub-folders are not going to be accessible through the web? For example, would it be safe to put in that folder resources that I only intend to be used by the application code? 

What is the real intended use of the <code>App_Data</code> folder?

EDIT:

Thank you for all the answers. From the answers received so far I am interested mostly in two points mentioned: 

<ol>
<li><a href="https://stackoverflow.com/questions/528858/what-is-the-appdata-folder-used-for-in-visual-studio/528876#528876">App_Data is essentially a storage point for file-based data store</a></li>
<li><a href="https://stackoverflow.com/questions/528858/what-is-the-appdata-folder-used-for-in-visual-studio/528872#528872">It should not be viewable by the web and is a place for the web app to store and read data from</a></li>
</ol>

Would someone be able specify how the "not viewable by the web" is ensured? 
Can I rely on that fact when performing standard deployment, or do I need to check some IIS settings on the server as well.

In the situation when I have a set of pdf files that I want to be accessible only from the application. Would App_Data folder be the right place to use, or should I create a separate folder and manually set IIS to ensure that it is not accessible by Web?

What is the App_Data folder used for in Visual Studio?

Visual Studio

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在Visual Studio中创建新的ASP.NET应用程序时，会自动创建两个文件和文件夹。其中一个文件夹名为App_Data。此外，当通过选择菜单选项Build->Publish发布网站时，有一个复选框可用Include files from the App_Data folder。我假设放在这个文件及其子文件夹中的...

问App_Data文件夹在Visual Studio中用来做什么？
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