blocks|key|27047|text|从.Net核心3.0版开始，访问已移动到web特定环境界面的WebRootPath应为IWebHostEnvironment。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|27048|将IWebHostEnvironment作为依赖项注入依赖类。框架将为您填充它|27049|public+class+HomeController+:+Controller+{
++++private+IWebHostEnvironment+_hostEnvironment;

++++public+HomeController(IWebHostEnvironment+environment)+{
++++++++_hostEnvironment+=+environment;
++++}

++++[HttpGet]
++++public+IActionResult+Get()+{
++++++++string+path+=+Path.Combine(_hostEnvironment.WebRootPath,+"Sample.PNG");
++++++++return+View();
++++}
}|code-block|syntax|javascript|27050|您可以更进一步，创建自己的路径提供程序服务抽象和实现。|27051|public+interface+IPathProvider+{
++++string+MapPath(string+path);
}

public+class+PathProvider+:+IPathProvider+{
++++private+IWebHostEnvironment+_hostEnvironment;

++++public+PathProvider(IWebHostEnvironment+environment)+{
++++++++_hostEnvironment+=+environment;
++++}

++++public+string+MapPath(string+path)+{
++++++++string+filePath+=+Path.Combine(_hostEnvironment.WebRootPath,+path);
++++++++return+filePath;
++++}
}|27052|并将IPathProvider注入依赖类。|27053|public+class+HomeController+:+Controller+{
++++private+IPathProvider+pathProvider;

++++public+HomeController(IPathProvider+pathProvider)+{
++++++++this.pathProvider+=+pathProvider;
++++}

++++[HttpGet]
++++public+IActionResult+Get()+{
++++++++string+path+=+pathProvider.MapPath("Sample.PNG");
++++++++return+View();
++++}
}|27054|确保将服务注册到DI容器|27055|services.AddSingleton<IPathProvider,+PathProvider>();|27056|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.hosting.iwebhostenvironment^0|U|B|17|J|17|J|0|0|1|J|0|0|0|0|2|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@$9|1B|A|1C|1|1D]]|E|$]]|$1|F|3|G|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1H|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1I|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1J|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1K|8|@$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|S|3|T|5|J|7|1N|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1O|8|@]|D|@]|E|$]]|$1|W|3|X|5|J|7|1P|8|@]|D|@]|E|$K|L]]|$1|Y|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]]]

As of .Net Core v3.0, it should be <a href="https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.hosting.iwebhostenvironment" rel="noreferrer"><code>IWebHostEnvironment</code></a> to access the <code>WebRootPath</code> which has been moved to the web specific environment interface.
Inject <code>IWebHostEnvironment</code> as a dependency into the dependent class. The framework will populate it for you
<pre><code>public class HomeController : Controller {
 private IWebHostEnvironment _hostEnvironment;

 public HomeController(IWebHostEnvironment environment) {
 _hostEnvironment = environment;
 }

 [HttpGet]
 public IActionResult Get() {
 string path = Path.Combine(_hostEnvironment.WebRootPath, &quot;Sample.PNG&quot;);
 return View();
 }
}
</code></pre>
You could go one step further and create your own path provider service abstraction and implementation.
<pre><code>public interface IPathProvider {
 string MapPath(string path);
}

public class PathProvider : IPathProvider {
 private IWebHostEnvironment _hostEnvironment;

 public PathProvider(IWebHostEnvironment environment) {
 _hostEnvironment = environment;
 }

 public string MapPath(string path) {
 string filePath = Path.Combine(_hostEnvironment.WebRootPath, path);
 return filePath;
 }
}
</code></pre>
And inject <code>IPathProvider</code> into dependent classes.
<pre><code>public class HomeController : Controller {
 private IPathProvider pathProvider;

 public HomeController(IPathProvider pathProvider) {
 this.pathProvider = pathProvider;
 }

 [HttpGet]
 public IActionResult Get() {
 string path = pathProvider.MapPath(&quot;Sample.PNG&quot;);
 return View();
 }
}
</code></pre>
Make sure to register the service with the DI container
<pre><code>services.AddSingleton&lt;IPathProvider, PathProvider&gt;();
</code></pre>

blocks|key|2485277|text|更好的解决方案是使用IFileProvider.GetFileInfo()方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2485278|++++public+IActionResult+ResizeCat([FromServices]+IFileProvider+fileProvider)
++++{
++++++++//+get+absolute+path+(equivalent+to+MapPath)
++++++++string+absolutePath+=+fileProvider.GetFileInfo("/assets/images/cat.jpg").PhysicalPath;++
++++++++...+
++++}|code-block|syntax|javascript|2485279|您必须注册IFileProvider+like+this+to+be+able+to+access+it+through+DI|2485280|++++//+This+method+gets+called+by+the+runtime.+Use+this+method+to+add+services+to+the+container.
++++public+void+ConfigureServices(IServiceCollection+services)
++++{
++++++++//+Add+framework+services.
++++++++services.AddMvc();

++++++++var+physicalProvider+=+_hostingEnvironment.ContentRootFileProvider;
++++++++var+embeddedProvider+=+new+EmbeddedFileProvider(Assembly.GetEntryAssembly());
++++++++var+compositeProvider+=+new+CompositeFileProvider(physicalProvider,+embeddedProvider);

++++++++//+choose+one+provider+to+use+for+the+app+and+register+it
++++++++//services.AddSingleton<IFileProvider>(physicalProvider);
++++++++//services.AddSingleton<IFileProvider>(embeddedProvider);
++++++++services.AddSingleton<IFileProvider>(compositeProvider);
++++}|2485281|正如您所看到的，这个逻辑(用于文件的来源)可能会变得相当复杂，但即使代码发生更改，也不会中断。|2485282|如果您有一些特殊的逻辑，您可以使用new+PhysicalFileProvider(root)创建自定义IFileProvider。我遇到过一种情况，我想在中间件中加载图像，并调整或裁剪它的大小。但这是一个Angular项目，因此部署的应用程序的路径是不同的。我编写的中间件从startup.cs获取IFileProvider，然后我就可以像过去使用MapPath一样使用GetFileInfo()了。|2485283|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/aspnet/core/fundamentals/file-providers?view=aspnetcore-2.1^0|A|R|0|0|5|D|J|18|0|0|0|0|H|U|1G|D|3U|A|46|D|4V|7|56|D|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|@$9|17|A|18|1|19]]|E|$]]|$1|M|3|N|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1B|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1C|8|@$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

A better solution is to use the <code>IFileProvider.GetFileInfo()</code> method.

<pre><code> public IActionResult ResizeCat([FromServices] IFileProvider fileProvider)
 {
 // get absolute path (equivalent to MapPath)
 string absolutePath = fileProvider.GetFileInfo("/assets/images/cat.jpg").PhysicalPath; 
 ... 
 }
</code></pre>

You must register <code>IFileProvider</code> <a href="https://docs.microsoft.com/en-us/aspnet/core/fundamentals/file-providers?view=aspnetcore-2.1" rel="nofollow noreferrer">like this to be able to access it through DI</a>:

<pre><code> // This method gets called by the runtime. Use this method to add services to the container.
 public void ConfigureServices(IServiceCollection services)
 {
 // Add framework services.
 services.AddMvc();

 var physicalProvider = _hostingEnvironment.ContentRootFileProvider;
 var embeddedProvider = new EmbeddedFileProvider(Assembly.GetEntryAssembly());
 var compositeProvider = new CompositeFileProvider(physicalProvider, embeddedProvider);

 // choose one provider to use for the app and register it
 //services.AddSingleton&lt;IFileProvider&gt;(physicalProvider);
 //services.AddSingleton&lt;IFileProvider&gt;(embeddedProvider);
 services.AddSingleton&lt;IFileProvider&gt;(compositeProvider);
 }
</code></pre>

As you can see this logic (for where a file comes from) can get quite complex, but your code won't break if it changes.

You can create a custom <code>IFileProvider</code> with <code>new PhysicalFileProvider(root)</code> if you have some special logic. I had a situation where I want to load an image in middleware, and resize or crop it. But it's an Angular project so the path is different for a deployed app. The middleware I wrote takes <code>IFileProvider</code> from <code>startup.cs</code> and then I could just use <code>GetFileInfo()</code> like I would have used <code>MapPath</code> in the past.

blocks|key|27100|text|不推荐使用*+Hack+*，但仅供参考您可以使用var+abs+=+Path.GetFullPath("~/Content/Images/Sample.PNG").Replace("~\\","");从相对路径获取绝对路径|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|27101|我更喜欢上面的DI/服务方法，但是如果你处于非依赖注入的情况下(例如，一个用Activator实例化的类)，那么这个方法是可行的。|27102|entityMap^0|5|8|O|24|0|12|9|0^^$0|@$1|2|3|4|5|6|7|K|8|@$9|L|A|M|B|C]|$9|N|A|O|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|P|8|@$9|Q|A|R|B|D]]|E|@]|F|$]]|$1|I|3|-4|5|6|7|S|8|@]|E|@]|F|$]]]|J|$]]

* Hack *
Not recommended, but FYI you can get an absolute path from a relative path with
<code>
var abs = Path.GetFullPath("~/Content/Images/Sample.PNG").Replace("~\\","");
</code>

Prefer the DI/Service approaches above, but if you are in a non-DI situation (e.g., a class instantiated with <code>Activator</code>) this will work.

blocks|key|28357|text|.Net核心3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|28358|例如，我想定位~/wwwroot/CSS|offset|length|style|CODE|28359|public+class+YourController+:+Controller+
{
++++private+readonly+IWebHostEnvironment+_webHostEnvironment;

++++public+YourController+(IWebHostEnvironment+webHostEnvironment)
++++{
++++++++_webHostEnvironment=+webHostEnvironment;
++++}

++++public+IActionResult+Index()
++++{
++++++++string+webRootPath+=+_webHostEnvironment.WebRootPath;
++++++++string+contentRootPath+=+_webHostEnvironment.ContentRootPath;

++++++++string+path+="";
++++++++path+=+Path.Combine(webRootPath+,+"CSS");
++++++++//or+path+=+Path.Combine(contentRootPath+,+"wwwroot"+,"CSS"+);
++++++++return+View();
++++}
}|code-block|syntax|javascript|28360|28361|一些技巧|28362|另外，如果您没有控制器或服务，请遵循最后一部分并将其类注册为单例。然后，在Startup.ConfigureServices中：|28363|services.AddSingleton<your_class_Name>();|28364|最后，在需要的地方注入your_class_Name。|28365|28366|.Net核心2|28367|28368|public+class+YourController+:+Controller
{
++++private+readonly+IHostingEnvironment+_HostEnvironment;

++++public+YourController+(IHostingEnvironment+HostEnvironment)
++++{
++++++++_HostEnvironment=+HostEnvironment;
++++}

++++public+ActionResult+Index()
++++{
++++++++string+webRootPath+=+_HostEnvironment.WebRootPath;
++++++++string+contentRootPath+=+_HostEnvironment.ContentRootPath;

++++++++string+path+="";
++++++++path+=+Path.Combine(webRootPath+,+"CSS");
++++++++//or+path+=+Path.Combine(contentRootPath+,+"wwwroot"+,"CSS"+);
++++++++return+View();
++++}
}|28369|28370|MoreDetails|28371|感谢@NKosi，但是IHostingEnvironment在MVC+core+3中已经过时了！！|28372|根据this的说法：|28373|过时类型(警告)：|28374|Microsoft.Extensions.Hosting.IHostingEnvironment
Microsoft.AspNetCore.Hosting.IHostingEnvironment
Microsoft.Extensions.Hosting.IApplicationLifetime
Microsoft.AspNetCore.Hosting.IApplicationLifetime
Microsoft.Extensions.Hosting.EnvironmentName
Microsoft.AspNetCore.Hosting.EnvironmentName|28375|新类型：|28376|Microsoft.Extensions.Hosting.IHostEnvironment
Microsoft.AspNetCore.Hosting.IWebHostEnvironment+:+IHostEnvironment
Microsoft.Extensions.Hosting.IHostApplicationLifetime
Microsoft.Extensions.Hosting.Environments+|28377|因此，您必须使用IWebHostEnvironment而不是IHostingEnvironment。|28378|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/aspnet/AspNetCore/issues/7749^0|0|7|D|0|0|0|0|0|0|B|F|0|0|0|7|D|0|0|0|0|B|J|0|2|4|0|0|0|0|0|0|8|J|U|J|0^^$0|@$1|2|3|4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1R|8|@$D|1S|E|1T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1U|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1W|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1X|8|@]|9|@]|A|$]]|$1|R|3|S|5|J|7|1Y|8|@]|9|@]|A|$K|L]]|$1|T|3|U|5|6|7|1Z|8|@$D|20|E|21|F|G]]|9|@]|A|$]]|$1|V|3|-4|5|6|7|22|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|23|8|@]|9|@]|A|$]]|$1|Y|3|C|5|6|7|24|8|@$D|25|E|26|F|G]]|9|@]|A|$]]|$1|Z|3|10|5|J|7|27|8|@]|9|@]|A|$K|L]]|$1|11|3|-4|5|6|7|28|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|29|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|2A|8|@$D|2B|E|2C|F|G]]|9|@]|A|$]]|$1|16|3|17|5|6|7|2D|8|@]|9|@$D|2E|E|2F|1|2G]]|A|$]]|$1|18|3|19|5|6|7|2H|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|J|7|2I|8|@]|9|@]|A|$K|L]]|$1|1C|3|1D|5|6|7|2J|8|@]|9|@]|A|$]]|$1|1E|3|1F|5|J|7|2K|8|@]|9|@]|A|$K|L]]|$1|1G|3|1H|5|6|7|2L|8|@$D|2M|E|2N|F|G]|$D|2O|E|2P|F|G]]|9|@]|A|$]]|$1|1I|3|-4|5|6|7|2Q|8|@]|9|@]|A|$]]]|1J|$1K|$5|1L|1M|1N|A|$1O|1P]]]]

<h2>.Net Core 3</h2>

For example I want to locate <code>~/wwwroot/CSS</code>

<pre><code>public class YourController : Controller 
{
 private readonly IWebHostEnvironment _webHostEnvironment;

 public YourController (IWebHostEnvironment webHostEnvironment)
 {
 _webHostEnvironment= webHostEnvironment;
 }

 public IActionResult Index()
 {
 string webRootPath = _webHostEnvironment.WebRootPath;
 string contentRootPath = _webHostEnvironment.ContentRootPath;

 string path ="";
 path = Path.Combine(webRootPath , "CSS");
 //or path = Path.Combine(contentRootPath , "wwwroot" ,"CSS" );
 return View();
 }
}
</code></pre>

<hr>

<h2>Some Tricks</h2>

Also if you don't have a controller or service,follow last Part and register it's class as a singleton.
Then, in Startup.ConfigureServices:

<pre><code>services.AddSingleton&lt;your_class_Name&gt;();
</code></pre>

Finally, inject <code>your_class_Name</code> where you need it.

<hr>

<h2>.Net Core 2</h2>

For example I want to locate <code>~/wwwroot/CSS</code>

<pre><code>public class YourController : Controller
{
 private readonly IHostingEnvironment _HostEnvironment;

 public YourController (IHostingEnvironment HostEnvironment)
 {
 _HostEnvironment= HostEnvironment;
 }

 public ActionResult Index()
 {
 string webRootPath = _HostEnvironment.WebRootPath;
 string contentRootPath = _HostEnvironment.ContentRootPath;

 string path ="";
 path = Path.Combine(webRootPath , "CSS");
 //or path = Path.Combine(contentRootPath , "wwwroot" ,"CSS" );
 return View();
 }
}
</code></pre>

<hr>

<h2>MoreDetails</h2>

Thanks to @NKosi but <code>IHostingEnvironment</code> is obsoleted in MVC core 3!!

according to <a href="https://github.com/aspnet/AspNetCore/issues/7749" rel="nofollow noreferrer">this</a> :

Obsolete types (warning):

<pre><code>Microsoft.Extensions.Hosting.IHostingEnvironment
Microsoft.AspNetCore.Hosting.IHostingEnvironment
Microsoft.Extensions.Hosting.IApplicationLifetime
Microsoft.AspNetCore.Hosting.IApplicationLifetime
Microsoft.Extensions.Hosting.EnvironmentName
Microsoft.AspNetCore.Hosting.EnvironmentName
</code></pre>

New types:

<pre><code>Microsoft.Extensions.Hosting.IHostEnvironment
Microsoft.AspNetCore.Hosting.IWebHostEnvironment : IHostEnvironment
Microsoft.Extensions.Hosting.IHostApplicationLifetime
Microsoft.Extensions.Hosting.Environments 
</code></pre>

So you must use <code>IWebHostEnvironment</code> instead of <code>IHostingEnvironment</code>.

blocks|key|2485474|text|.NET核心3.0|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2485475|变量1：|2485476|string+path+=+System.IO.Directory.GetCurrentDirectory();|code-block|syntax|javascript|2485477|变量2：|2485478|string+path+=+AppDomain.CurrentDomain.BaseDirectory.Substring(0,+AppDomain.CurrentDomain.BaseDirectory.IndexOf("\\bin"));|2485479|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

<h3>.NET Core 3.0</h3>
Var 1:
<pre><code>string path = System.IO.Directory.GetCurrentDirectory();
</code></pre>
Var 2:
<pre><code>string path = AppDomain.CurrentDomain.BaseDirectory.Substring(0, AppDomain.CurrentDomain.BaseDirectory.IndexOf(&quot;\\bin&quot;));
</code></pre>

How to get absolute path in ASP net core alternative way for <code>Server.MapPath</code>

I have tried to use <code>IHostingEnvironment</code> but it doesn't give proper result.

<pre><code>IHostingEnvironment env = new HostingEnvironment();
var str1 = env.ContentRootPath; // Null
var str2 = env.WebRootPath; // Null, both doesn't give any result 
</code></pre>

I have one image file (Sample.PNG) in wwwroot folder I need to get this absolute path.

How to get absolute path in ASP.Net Core alternative way for Server.MapPath

中间件

容器

如何在ASP.NET核心中获取绝对路径Server.MapPath的替代方法我尝试过使用IHostingEnvironment，但是它没有给出正确的结果。IHostingEnvironment env = new HostingEnvironment();var str1 = env.ContentRootPath; ...

问如何在ASP.Net核心中获取绝对路径Server.MapPath的替代方法
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在ASP.Net核心中获取绝对路径Server.MapPath的替代方法EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在ASP.Net核心中获取绝对路径Server.MapPath的替代方法
EN