blocks|key|345014|text|要获取AppData目录，最好使用GetFolderPath方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|345015|Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)|code-block|syntax|javascript|345016|(如果不存在，则必须添加using+System+)。|345017|%25AppData%25是一个环境变量，它们不会自动扩展到.NET中的任何位置，尽管您可以显式使用Environment.ExpandEnvironmentVariable方法来执行此操作。但是，我仍然强烈建议您使用GetFolderPath，因为正如Johannes+Rössel在评论中指出的那样，在某些情况下可能不会设置%25AppData%25。|345018|最后，要创建示例中所示的路径：|345019|var+fileName+=+Path.Combine(Environment.GetFolderPath(
++++Environment.SpecialFolder.ApplicationData),+"DateLinks.xml");|345020|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/api/system.environment.expandenvironmentvariables^0|H|D|0|0|C|C|0|0|9|1A|11|2X|D|4G|9|1A|11|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|O|3|P|5|6|7|1J|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1K|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|1L|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

To get the AppData directory, it's best to use the <code>GetFolderPath</code> method:

<pre><code>Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)
</code></pre>

(must add <code>using System</code> if not present).

<code>%AppData%</code> is an environment variable, and they are not automatically expanded anywhere in .NET, although you can explicitly use the <a href="https://docs.microsoft.com/en-us/dotnet/api/system.environment.expandenvironmentvariables" rel="noreferrer"><code>Environment.ExpandEnvironmentVariable</code></a> method to do so. I would still strongly suggest that you use <code>GetFolderPath</code> however, because as Johannes Rössel points out in the comment, <code>%AppData%</code> may not be set in certain circumstances.

Finally, to create the path as shown in your example:

<pre><code>var fileName = Path.Combine(Environment.GetFolderPath(
 Environment.SpecialFolder.ApplicationData), "DateLinks.xml");
</code></pre>

blocks|key|345035|text|我不认为将%25AppData%25放在这样的字符串中会起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|345036|试一试|345037|Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData).ToString()|code-block|syntax|javascript|345038|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I don't think putting %AppData% in a string like that will work.

try

<pre><code>Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData).ToString()
</code></pre>

blocks|key|3325865|text|您还可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3325866|Environment.ExpandEnvironmentVariables("%25AppData%25\\DateLinks.xml");|code-block|syntax|javascript|3325867|展开%25AppData%25变量。|offset|length|style|CODE|3325868|entityMap^0|0|0|2|9|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can also use

<pre><code>Environment.ExpandEnvironmentVariables("%AppData%\\DateLinks.xml");
</code></pre>

to expand the <code>%AppData%</code> variable.

blocks|key|340159|text|如果您使用的是ASP.NET，则路径会有所不同。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|340160|我找不到任何指向ASP.NET的/App_Data的“SpecialFolder”值。|340161|相反，您需要这样做：|340162|+HttpContext.Current.ApplicationInstance.Server.MapPath("~/App_Data")++|code-block|syntax|javascript|340163|(注意:+MVC控制器中不需要'Current‘属性)|340164|如果有另一种更“抽象”的方法来访问App_Data，我会很乐意听到的。|offset|length|style|CODE|340165|entityMap^0|0|0|0|0|0|H|8|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@$O|10|P|11|Q|R]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

The path is different if you're talking ASP.NET.

I couldn't find any of the 'SpecialFolder' values that pointed to /App_Data for ASP.NET.

Instead you need to do this:

<pre><code> HttpContext.Current.ApplicationInstance.Server.MapPath("~/App_Data") 
</code></pre>

(Note: You don't need the 'Current' property in an MVC Controller)

If theres another more 'abstract' way to get to <code>App_Data</code> would love to hear how.

blocks|key|3325910|text|在.net2.0中，您可以使用变量Application.UserAppDataPath|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3325911|entityMap^0|H|R|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

In .net2.0 you can use the variable <code>Application.UserAppDataPath</code>

blocks|key|3325919|text|最好的方式是使用AppData目录，是使用Environment.ExpandEnvironmentVariables的方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|3325920|原因：|3325921|case-insensitive|3325922|it很简单，uncomplicated|unordered-list-item|3325923|
|3325924|it是一种用于处理|3325925|3325926|3325927|
的standard|3325928|good，它可以用有效目录或其他任何方式替换字符串的一部分|3325929|3325930|示例：|3325931|string+path;
path+=+@"%25AppData%25\stuff";
path+=+@"%25aPpdAtA%25\HelloWorld";
path+=+@"%25progRAMfiLES%25\Adobe;%25appdata%25\FileZilla";+//+collection+of+paths

path+=+Environment.ExpandEnvironmentVariables(path);
Console.WriteLine(path);|code-block|syntax|javascript|3325932|3325933|%25ALLUSERSPROFILE%25+++C:\ProgramData
%25APPDATA%25+++C:\Users\Username\AppData\Roaming
%25COMMONPROGRAMFILES%25++++C:\Program+Files\Common+Files
%25COMMONPROGRAMFILES(x86)%25+++C:\Program+Files+(x86)\Common+Files
%25COMSPEC%25+++C:\Windows\System32\cmd.exe
%25HOMEDRIVE%25+C:
%25HOMEPATH%25++C:\Users\Username
%25LOCALAPPDATA%25++C:\Users\Username\AppData\Local
%25PROGRAMDATA%25+++C:\ProgramData
%25PROGRAMFILES%25++C:\Program+Files
%25PROGRAMFILES(X86)%25+C:\Program+Files+(x86)+(only+in+64-bit+version)
%25PUBLIC%25++++C:\Users\Public
%25SystemDrive%25+++C:
%25SystemRoot%25++++C:\Windows
%25TEMP%25+and+%25TMP%25++++C:\Users\Username\AppData\Local\Temp
%25USERPROFILE%25+++C:\Users\Username
%25WINDIR%25++++C:\Windows|3325934|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.environment.expandenvironmentvariables.aspx^0|0|3|I|1|L|12|L|12|0|0|0|3|0|0|0|0|0|0|0|0|0|0|0|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1G|8|@$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]|$9|1L|A|1M|B|D]]|E|@$9|1N|A|1O|1|1P]]|F|$]]|$1|G|3|H|5|6|7|1Q|8|@$9|1R|A|1S|B|C]]|E|@]|F|$]]|$1|I|3|J|5|6|7|1T|8|@]|E|@]|F|$]]|$1|K|3|L|5|M|7|1U|8|@]|E|@]|F|$]]|$1|N|3|O|5|6|7|1V|8|@]|E|@]|F|$]]|$1|P|3|Q|5|M|7|1W|8|@]|E|@]|F|$]]|$1|R|3|O|5|6|7|1X|8|@]|E|@]|F|$]]|$1|S|3|-4|5|M|7|1Y|8|@]|E|@]|F|$]]|$1|T|3|U|5|6|7|1Z|8|@]|E|@]|F|$]]|$1|V|3|W|5|M|7|20|8|@]|E|@]|F|$]]|$1|X|3|-4|5|6|7|21|8|@]|E|@]|F|$]]|$1|Y|3|Z|5|6|7|22|8|@$9|23|A|24|B|C]]|E|@]|F|$]]|$1|10|3|11|5|12|7|25|8|@]|E|@]|F|$13|14]]|$1|15|3|-4|5|6|7|26|8|@]|E|@]|F|$]]|$1|16|3|17|5|12|7|27|8|@]|E|@]|F|$13|14]]|$1|18|3|-4|5|6|7|28|8|@]|E|@]|F|$]]]|19|$1A|$5|1B|1C|1D|F|$1E|1F]]]]

The BEST way to use the AppData directory, IS to use <a href="http://msdn.microsoft.com/en-us/library/system.environment.expandenvironmentvariables.aspx" rel="noreferrer"><code>Environment.ExpandEnvironmentVariables</code></a> method.
Reasons:
<ul>
<li>it replaces parts of your string with valid directories or whatever</li>
<li>it is case-insensitive</li>
<li>it is easy and uncomplicated</li>
<li>it is a standard</li>
<li>good for dealing with user input</li>
</ul>
Examples:
<pre><code>string path;
path = @&quot;%AppData%\stuff&quot;;
path = @&quot;%aPpdAtA%\HelloWorld&quot;;
path = @&quot;%progRAMfiLES%\Adobe;%appdata%\FileZilla&quot;; // collection of paths

path = Environment.ExpandEnvironmentVariables(path);
Console.WriteLine(path);
</code></pre>
<a href="https://www.askvg.com/list-of-environment-variables-in-windows-xp-vista-and-7/" rel="noreferrer">More info:</a>
<pre><code>%ALLUSERSPROFILE% C:\ProgramData
%APPDATA% C:\Users\Username\AppData\Roaming
%COMMONPROGRAMFILES% C:\Program Files\Common Files
%COMMONPROGRAMFILES(x86)% C:\Program Files (x86)\Common Files
%COMSPEC% C:\Windows\System32\cmd.exe
%HOMEDRIVE% C:
%HOMEPATH% C:\Users\Username
%LOCALAPPDATA% C:\Users\Username\AppData\Local
%PROGRAMDATA% C:\ProgramData
%PROGRAMFILES% C:\Program Files
%PROGRAMFILES(X86)% C:\Program Files (x86) (only in 64-bit version)
%PUBLIC% C:\Users\Public
%SystemDrive% C:
%SystemRoot% C:\Windows
%TEMP% and %TMP% C:\Users\Username\AppData\Local\Temp
%USERPROFILE% C:\Users\Username
%WINDIR% C:\Windows
</code></pre>

blocks|key|3325939|text|只是想分享一下在我的mvc应用程序中访问'App_Data‘文件夹的另一种方式，以防有人需要它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3325940|+Path.Combine(HttpRuntime.AppDomainAppPath,"App_Data")|code-block|syntax|javascript|3325941|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|$]]

Just wanted to share another way of accessing 'App_Data' folder in my mvc application in case that someone needs this.

<pre><code> Path.Combine(HttpRuntime.AppDomainAppPath,"App_Data")
</code></pre>

blocks|key|3325952|text|这在控制台应用程序中对我来说是有效的-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3325953|string+appData+=+System.Environment.GetEnvironmentVariable("APPDATA");|code-block|syntax|javascript|3325954|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|$]]

This is working for me in a console application - 

<pre><code>string appData = System.Environment.GetEnvironmentVariable("APPDATA");
</code></pre>

blocks|key|3325982|text|对于ASP.NET，需要在应用程序池上设置Load+User+Profile设置，但这还不够。\Windows\System32\inetsrv\Config\applicationHost.config中有一个名为setProfileEnvironment的隐藏设置，由于某种原因，默认情况下该设置处于关闭状态，而不是像documentation中所述那样处于打开状态。您可以更改默认值，也可以在您的应用程序池中设置它。然后，Environment类上的所有方法都将返回正确的值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3325983|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/iis/configuration/system.applicationhost/applicationpools/add/processmodel^0|L|H|1B|1J|30|L|5Y|B|4H|D|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

For ASP.NET, the <code>Load User Profile</code> setting needs to be set on the app pool but that's not enough. There is a hidden setting named <code>setProfileEnvironment</code> in <code>\Windows\System32\inetsrv\Config\applicationHost.config</code>, which for some reason is turned off by default, instead of on as described in the <a href="https://docs.microsoft.com/en-us/iis/configuration/system.applicationhost/applicationpools/add/processmodel" rel="nofollow noreferrer">documentation</a>. You can either change the default or set it on your app pool. All the methods on the <code>Environment</code> class will then return proper values.

blocks|key|341662|text|AppData本地也称为C:\Users\<user>\AppData\Local(⇝)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|341663|Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)|code-block|syntax|javascript|341664|341665|又名AppData+Roaming+(C:\Users\<user>\AppData\Roaming)的⇝：|341666|Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)|341667|341668|此外，了解以下内容可能会很方便：|341669|341670|Environment.SpecialFolder.ProgramFiles+-适用于程序文件的folder|unordered-list-item|341671|Environment.SpecialFolder.ProgramFilesX86+-适用于程序文件的X64+X86文件夹|341672|341673|有关完整列表，请查看here。|341674|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/api/system.environment.specialfolder?view=netcore-3.1^0|0|9|C|T|0|0|0|2|F|J|V|0|0|0|0|0|0|12|0|0|15|0|0|A|4|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|1F|8|@]|E|@]|F|$J|K]]|$1|L|3|-4|5|6|7|1G|8|@]|E|@]|F|$]]|$1|M|3|N|5|6|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|D]]|E|@]|F|$]]|$1|O|3|P|5|I|7|1M|8|@]|E|@]|F|$J|K]]|$1|Q|3|-4|5|6|7|1N|8|@]|E|@]|F|$]]|$1|R|3|S|5|6|7|1O|8|@]|E|@]|F|$]]|$1|T|3|-4|5|6|7|1P|8|@]|E|@]|F|$]]|$1|U|3|V|5|W|7|1Q|8|@$9|1R|A|1S|B|D]]|E|@]|F|$]]|$1|X|3|Y|5|W|7|1T|8|@$9|1U|A|1V|B|D]]|E|@]|F|$]]|$1|Z|3|-4|5|6|7|1W|8|@]|E|@]|F|$]]|$1|10|3|11|5|6|7|1X|8|@]|E|@$9|1Y|A|1Z|1|20]]|F|$]]|$1|12|3|-4|5|6|7|21|8|@]|E|@]|F|$]]]|13|$14|$5|15|16|17|F|$18|19]]]]

AppData ⇝ Local aka (<code>C:\Users\&lt;user&gt;\AppData\Local</code>):
<pre class="lang-cs prettyprint-override"><code>Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)
</code></pre>
<hr />
AppData ⇝ Roaming aka (<code>C:\Users\&lt;user&gt;\AppData\Roaming</code>):
<pre class="lang-cs prettyprint-override"><code>Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)
</code></pre>
<hr />
Additionally, it could be handy to know:
<ul>
<li><code>Environment.SpecialFolder.ProgramFiles</code> - for Program files X64 folder</li>
<li><code>Environment.SpecialFolder.ProgramFilesX86</code> - for Program files X86 folder</li>
</ul>
For the full list check <a href="https://docs.microsoft.com/en-us/dotnet/api/system.environment.specialfolder?view=netcore-3.1" rel="noreferrer">here</a>.

C# 2008 SP1

I am using the code below:

<pre><code>dt.ReadXml("%AppData%\\DateLinks.xml");
</code></pre>

However, I am getting an exception that points to the location of where my application is running from:

<blockquote>
 Could not find a part of the path
 'D:\Projects\SubVersionProjects\CatDialer\bin\Debug\%AppData%\DateLinks.xml'.
</blockquote>

I thought the <code>%AppData%</code> should find the relative path. When I go <code>Start|Run|%AppData%</code> windows explorer takes me to that directory.

I can not put the full path in, as the user is different on each client machine.

C# getting the path of %AppData%

Windows

C# 2008 SP1我使用的代码如下：dt.ReadXml("%AppData%\\DateLinks.xml");然而，我得到了一个异常，它指向我的应用程序运行的位置：无法找到路径'D:\Projects\SubVersionProjects\CatDialer\bin\Debug\%AppData%\DateLi...

问C#正在获取%AppData%的路径
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