blocks|key|4485084|text|首先:+Microsoft.Framework.ConfigurationModel的程序集名称和命名空间已更改为Microsoft.Framework.Configuration。所以你应该使用:例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4485085|"Microsoft.Framework.Configuration.Json":+"1.0.0-beta7"|code-block|syntax|javascript|4485086|作为project.json中的依赖项。如果您没有安装7，请使用beta5或6。然后你就可以在Startup.cs中做这样的事情了。|offset|length|style|CODE|4485087|public+IConfiguration+Configuration+{+get;+set;+}

public+Startup(IHostingEnvironment+env,+IApplicationEnvironment+appEnv)
{
+++++var+configurationBuilder+=+new+ConfigurationBuilder(appEnv.ApplicationBasePath)
++++++++.AddJsonFile("config.json")
++++++++.AddEnvironmentVariables();
+++++Configuration+=+configurationBuilder.Build();
}|4485088|如果您想要从config.json中检索变量，可以使用以下命令立即获取该变量：|4485089|public+void+Configure(IApplicationBuilder+app)
{
++++//+Add+.Value+to+get+the+token+string
++++var+token+=+Configuration.GetSection("AppSettings:token");
++++app.Run(async+(context)+=>
++++{
++++++++await+context.Response.WriteAsync("This+is+a+token+with+key+("+%2B+token.Key+%2B+")+"+%2B+token.Value);
++++});
}|4485090|或者您可以创建一个名为AppSettings的类，如下所示：|4485091|public+class+AppSettings
{
++++public+string+token+{+get;+set;+}
}|4485092|并像这样配置服务：|4485093|public+void+ConfigureServices(IServiceCollection+services)
{+++++++
++++services.AddMvc();

++++services.Configure<MvcOptions>(options+=>
++++{
++++++++//mvc+options
++++});

++++services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));
}|4485094|然后通过这样的控制器访问它：|4485095|public+class+HomeController+:+Controller
{
++++private+string+_token;

++++public+HomeController(IOptions<AppSettings>+settings)
++++{
++++++++_token+=+settings.Options.token;
++++}
}|4485096|entityMap^0|0|0|2|C|1B|A|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@$I|19|J|1A|K|L]|$I|1B|J|1C|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1G|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|1H|8|@]|9|@]|A|$E|F]]|$1|W|3|X|5|6|7|1I|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1J|8|@]|9|@]|A|$E|F]]|$1|10|3|11|5|6|7|1K|8|@]|9|@]|A|$]]|$1|12|3|13|5|D|7|1L|8|@]|9|@]|A|$E|F]]|$1|14|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|15|$]]

First off:
The assembly name and namespace of Microsoft.Framework.ConfigurationModel has changed to Microsoft.Framework.Configuration. So you should use:
e.g.

<pre><code>"Microsoft.Framework.Configuration.Json": "1.0.0-beta7"
</code></pre>

as a dependency in <code>project.json</code>. Use beta5 or 6 if you don't have 7 installed.
Then you can do something like this in <code>Startup.cs</code>.

<pre><code>public IConfiguration Configuration { get; set; }

public Startup(IHostingEnvironment env, IApplicationEnvironment appEnv)
{
 var configurationBuilder = new ConfigurationBuilder(appEnv.ApplicationBasePath)
 .AddJsonFile("config.json")
 .AddEnvironmentVariables();
 Configuration = configurationBuilder.Build();
}
</code></pre>

If you then want to retrieve a variable from the config.json you can get it right away using:

<pre><code>public void Configure(IApplicationBuilder app)
{
 // Add .Value to get the token string
 var token = Configuration.GetSection("AppSettings:token");
 app.Run(async (context) =&gt;
 {
 await context.Response.WriteAsync("This is a token with key (" + token.Key + ") " + token.Value);
 });
}
</code></pre>

or you can create a class called AppSettings like this:

<pre><code>public class AppSettings
{
 public string token { get; set; }
}
</code></pre>

and configure the services like this:

<pre><code>public void ConfigureServices(IServiceCollection services)
{ 
 services.AddMvc();

 services.Configure&lt;MvcOptions&gt;(options =&gt;
 {
 //mvc options
 });

 services.Configure&lt;AppSettings&gt;(Configuration.GetSection("AppSettings"));
}
</code></pre>

and then access it through e.g. a controller like this:

<pre><code>public class HomeController : Controller
{
 private string _token;

 public HomeController(IOptions&lt;AppSettings&gt; settings)
 {
 _token = settings.Options.token;
 }
}
</code></pre>

blocks|key|4484157|text|他们只是不断地改变事情-刚刚更新了Visual+Visual+Studio并拥有了整个项目炸弹，在恢复的道路上，新的方式看起来像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4484158|public+Startup(IHostingEnvironment+env)
{
++++var+builder+=+new+ConfigurationBuilder()
++++++++.SetBasePath(env.ContentRootPath)
++++++++.AddJsonFile("appsettings.json",+optional:+true,+reloadOnChange:+true)
++++++++.AddJsonFile($"appsettings.{env.EnvironmentName}.json",+optional:+true);

++++if+(env.IsDevelopment())
++++{
++++++++//+For+more+details+on+using+the+user+secret+store+see+http://go.microsoft.com/fwlink/?LinkID=532709
++++++++builder.AddUserSecrets();
++++}

++++builder.AddEnvironmentVariables();
++++Configuration+=+builder.Build();
}|code-block|syntax|javascript|4484159|我一直在错过这句话！|4484160|.SetBasePath(env.ContentRootPath)|4484161|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

They just keep changing things – having just updated Visual&nbsp;Studio and had the whole project bomb, on the road to recovery and the new way looks like this:

<pre><code>public Startup(IHostingEnvironment env)
{
 var builder = new ConfigurationBuilder()
 .SetBasePath(env.ContentRootPath)
 .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
 .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);

 if (env.IsDevelopment())
 {
 // For more details on using the user secret store see http://go.microsoft.com/fwlink/?LinkID=532709
 builder.AddUserSecrets();
 }

 builder.AddEnvironmentVariables();
 Configuration = builder.Build();
}
</code></pre>

I kept missing this line!

<pre><code>.SetBasePath(env.ContentRootPath)
</code></pre>

blocks|key|4485141|text|如果您只想获取令牌的值，那么使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4485142|Configuration["AppSettings:token"]|offset|length|style|CODE|4485143|entityMap^0|0|0|Y|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

If you just want to get the value of the token then use

<code>Configuration["AppSettings:token"]</code>

blocks|key|4484220|text|对于.NET+Core2.0，情况发生了一些变化。启动构造函数接受配置对象作为参数，因此不需要使用ConfigurationBuilder。下面是我的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4484221|public+Startup(IConfiguration+configuration)
{
++++Configuration+=+configuration;
}

public+IConfiguration+Configuration+{+get;+}

//+This+method+gets+called+by+the+runtime.+Use+this+method+to+add+services+to+the+container.
public+void+ConfigureServices(IServiceCollection+services)
{
++++services.Configure<StorageOptions>(Configuration.GetSection("AzureStorageConfig"));
}|code-block|syntax|javascript|4484222|我的POCO是顶部提到的StorageOptions对象：|4484223|namespace+FictionalWebApp.Models
{
++++public+class+StorageOptions
++++{
++++++++public+String+StorageConnectionString+{+get;+set;+}
++++++++public+String+AccountName+{+get;+set;+}
++++++++public+String+AccountKey+{+get;+set;+}
++++++++public+String+DefaultEndpointsProtocol+{+get;+set;+}
++++++++public+String+EndpointSuffix+{+get;+set;+}

++++++++public+StorageOptions()+{+}
++++}
}|4484224|这个配置实际上是我的名为AzureStorageConfig的appsettings.json文件的一部分|4484225|{
++"ConnectionStrings":+{
++++"DefaultConnection":+"Server=(localdb)\\mssqllocaldb;",
++++"StorageConnectionString":+"DefaultEndpointsProtocol=https;AccountName=fictionalwebapp;AccountKey=Cng4Afwlk242-23=-_d2ksa69*2xM0jLUUxoAw==;EndpointSuffix=core.windows.net"
++},
++"Logging":+{
++++"IncludeScopes":+false,
++++"LogLevel":+{
++++++"Default":+"Warning"
++++}
++},

++"AzureStorageConfig":+{
++++"AccountName":+"fictionalwebapp",
++++"AccountKey":+"Cng4Afwlk242-23=-_d2ksa69*2xM0jLUUxoAw==",
++++"DefaultEndpointsProtocol":+"https",
++++"EndpointSuffix":+"core.windows.net",
++++"StorageConnectionString":+"DefaultEndpointsProtocol=https;AccountName=fictionalwebapp;AccountKey=Cng4Afwlk242-23=-_d2ksa69*2xM0jLUUxoAw==;EndpointSuffix=core.windows.net"
++}
}|4484226|我唯一要补充的是，由于构造函数已经更改，我还没有测试是否需要执行一些额外的操作才能加载appsettings.<environmentname>.json而不是appsettings.json。|4484227|entityMap^0|1D|K|0|0|C|E|0|0|C|I|V|G|0|0|17|Y|28|G|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|V|$]]

For .NET Core 2.0, things have changed a little bit. The startup constructor takes a Configuration object as a parameter, So using the <code>ConfigurationBuilder</code> is not required. Here is mine:

<pre><code>public Startup(IConfiguration configuration)
{
 Configuration = configuration;
}

public IConfiguration Configuration { get; }

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
 services.Configure&lt;StorageOptions&gt;(Configuration.GetSection("AzureStorageConfig"));
}
</code></pre>

My POCO is the <code>StorageOptions</code> object mentioned at the top:

<pre><code>namespace FictionalWebApp.Models
{
 public class StorageOptions
 {
 public String StorageConnectionString { get; set; }
 public String AccountName { get; set; }
 public String AccountKey { get; set; }
 public String DefaultEndpointsProtocol { get; set; }
 public String EndpointSuffix { get; set; }

 public StorageOptions() { }
 }
}
</code></pre>

And the configuration is actually a subsection of my <code>appsettings.json</code> file, named <code>AzureStorageConfig</code>:

<pre><code>{
 "ConnectionStrings": {
 "DefaultConnection": "Server=(localdb)\\mssqllocaldb;",
 "StorageConnectionString": "DefaultEndpointsProtocol=https;AccountName=fictionalwebapp;AccountKey=Cng4Afwlk242-23=-_d2ksa69*2xM0jLUUxoAw==;EndpointSuffix=core.windows.net"
 },
 "Logging": {
 "IncludeScopes": false,
 "LogLevel": {
 "Default": "Warning"
 }
 },

 "AzureStorageConfig": {
 "AccountName": "fictionalwebapp",
 "AccountKey": "Cng4Afwlk242-23=-_d2ksa69*2xM0jLUUxoAw==",
 "DefaultEndpointsProtocol": "https",
 "EndpointSuffix": "core.windows.net",
 "StorageConnectionString": "DefaultEndpointsProtocol=https;AccountName=fictionalwebapp;AccountKey=Cng4Afwlk242-23=-_d2ksa69*2xM0jLUUxoAw==;EndpointSuffix=core.windows.net"
 }
}
</code></pre>

The only thing I'll add is that, since the constructor has changed, I haven't tested whether something extra needs to be done for it to load <code>appsettings.&lt;environmentname&gt;.json</code> as opposed to <code>appsettings.json</code>.

blocks|key|4484250|text|我怀疑这是不是一个好的做法，但它在本地是有效的。如果在发布/部署(到IIS服务)时失败，我会更新它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4484251|第1步-将此程序集添加到您的类(在我的例子中，是控制器类)的顶部：|4484252|using+Microsoft.Extensions.Configuration;|code-block|syntax|javascript|4484253|第2步-添加这个或类似的内容：|4484254|var+config+=+new+ConfigurationBuilder()
++++++++++++++++.SetBasePath(Directory.GetCurrentDirectory())
++++++++++++++++.AddJsonFile("appsettings.json").Build();|4484255|第3步-通过执行以下操作调用键的值(返回字符串)：|4484256|config["NameOfYourKey"]|4484257|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I doubt this is good practice but it's working locally. I'll update this if it fails when I publish/deploy (to an IIS web service).

Step 1 - Add this assembly to the top of your class (in my case, controller class):

<pre><code>using Microsoft.Extensions.Configuration;
</code></pre>

Step 2 - Add this or something like it:

<pre><code>var config = new ConfigurationBuilder()
 .SetBasePath(Directory.GetCurrentDirectory())
 .AddJsonFile("appsettings.json").Build();
</code></pre>

Step 3 - Call your key's value by doing this (returns string):

<pre><code>config["NameOfYourKey"]
</code></pre>

blocks|key|4484274|text|只是为了补充尤瓦尔·伊茨查科夫的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4484275|你可以不使用构建器函数来加载配置，你可以直接注入它。|4484276|public+IConfiguration+Configuration+{+get;+set;+}

public+Startup(IConfiguration+configuration)
{
+++Configuration+=+configuration;
}|code-block|syntax|javascript|4484277|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|$]]

Just to complement the Yuval Itzchakov answer.

You can load configuration without builder function, you can just inject it.

<pre><code>public IConfiguration Configuration { get; set; }

public Startup(IConfiguration configuration)
{
 Configuration = configuration;
}
</code></pre>

blocks|key|4484310|text|这是“作弊”吗？我只是在Startup类中设置了静态配置，然后我就可以从其他任何地方访问它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4484311|public+class+Startup
{
++++//+This+method+gets+called+by+the+runtime.+Use+this+method+to+add+services+to+the+container.
++++//+For+more+information+on+how+to+configure+your+application,+visit+https://go.microsoft.com/fwlink/?LinkID=398940
++++public+Startup(IHostingEnvironment+env)
++++{
++++++++var+builder+=+new+ConfigurationBuilder()
++++++++++++.SetBasePath(env.ContentRootPath)
++++++++++++.AddJsonFile("appsettings.json",+optional:+true,+reloadOnChange:+true)
++++++++++++.AddJsonFile($"appsettings.{env.EnvironmentName}.json",+optional:+true)
++++++++++++.AddEnvironmentVariables();

++++++++Configuration+=+builder.Build();
++++}

++++public+static+IConfiguration+Configuration+{+get;+set;+}|code-block|syntax|javascript|4484312|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|$]]

Was this "cheating"? I just made my Configuration in the Startup class static, and then I can access it from anywhere else:

<pre><code>public class Startup
{
 // This method gets called by the runtime. Use this method to add services to the container.
 // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
 public Startup(IHostingEnvironment env)
 {
 var builder = new ConfigurationBuilder()
 .SetBasePath(env.ContentRootPath)
 .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
 .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
 .AddEnvironmentVariables();

 Configuration = builder.Build();
 }

 public static IConfiguration Configuration { get; set; }
</code></pre>

blocks|key|4484336|text|使用.NET+Core2.2，并且以最简单的方式...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4484337|public+IActionResult+Index([FromServices]+IConfiguration+config)
{
++++var+myValue+=+config.GetValue<string>("MyKey");
}|code-block|syntax|javascript|4484338|appsettings.json是通过构造函数或动作注入自动加载和使用的，IConfiguration上也有一个GetSection方法。如果您只需要appsettings.json，那么就不需要修改Startup.cs或Program.cs。|offset|length|style|CODE|4484339|entityMap^0|0|0|0|G|11|E|1K|A|23|G|2S|A|33|A|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]|$I|T|J|U|K|L]|$I|V|J|W|K|L]|$I|X|J|Y|K|L]|$I|Z|J|10|K|L]|$I|11|J|12|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|N|$]]

With .NET Core 2.2, and in the simplest way possible...

<pre><code>public IActionResult Index([FromServices] IConfiguration config)
{
 var myValue = config.GetValue&lt;string&gt;("MyKey");
}
</code></pre>

<code>appsettings.json</code> is automatically loaded and available through either constructor or action injection, and there's a <code>GetSection</code> method on <code>IConfiguration</code> as well. There isn't any need to alter <code>Startup.cs</code> or <code>Program.cs</code> if all you need is <code>appsettings.json</code>.

blocks|key|4484350|text|通过调用Get<YourType>()在控制器内部将其作为对象获取|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4484351|public+IActionResult+Index([FromServices]+IConfiguration+config)
{
++++BillModel+model+=+config.GetSection("Yst.Requisites").Get<BillModel>();
++++return+View(model);
}|code-block|syntax|javascript|4484352|entityMap^0|4|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Get it inside controller as an object via call <code>Get&lt;YourType&gt;()</code>:

<pre><code>public IActionResult Index([FromServices] IConfiguration config)
{
 BillModel model = config.GetSection("Yst.Requisites").Get&lt;BillModel&gt;();
 return View(model);
}
</code></pre>

blocks|key|4484384|text|你可以试试下面的代码。这对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4484385|public+class+Settings
{
++++private+static+IHttpContextAccessor+_HttpContextAccessor;

++++public+Settings(IHttpContextAccessor+httpContextAccessor)
++++{
++++++++_HttpContextAccessor+=+httpContextAccessor;
++++}

++++public+static+void+Configure(IHttpContextAccessor+httpContextAccessor)
++++{
++++++++_HttpContextAccessor+=+httpContextAccessor;
++++}

++++public+static+IConfigurationBuilder+Getbuilder()
++++{
++++++++var+builder+=+new+ConfigurationBuilder()
++++++++++.SetBasePath(Directory.GetCurrentDirectory())
++++++++++.AddJsonFile("appsettings.json");
++++++++return+builder;
++++}

++++public+static+string+GetAppSetting(string+key)
++++{
++++++++//return+Convert.ToString(ConfigurationManager.AppSettings[key]);
++++++++var+builder+=+Getbuilder();
++++++++var+GetAppStringData+=+builder.Build().GetValue<string>("AppSettings:"+%2B+key);
++++++++return+GetAppStringData;
++++}

++++public+static+string+GetConnectionString(string+key="DefaultName")
++++{
++++++++var+builder+=+Getbuilder();
++++++++var+ConnectionString+=+builder.Build().GetValue<string>("ConnectionStrings:"%2Bkey);
++++++++return+ConnectionString;
++++}
}|code-block|syntax|javascript|4484386|在这里，我创建了一个类来获取连接字符串和应用程序设置。|4484387|I+Startup.cs文件，您需要注册类，如下所示。|4484388|public+class+Startup
{

++++public+void+Configure(IApplicationBuilder+app,+IHostingEnvironment+env)
++++{
++++++++var+httpContextAccessor+=+app.ApplicationServices.GetRequiredService<IHttpContextAccessor>();
++++++++Settings.Configure(httpContextAccessor);
++++}
}|4484389|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can try below code. This is working for me.

<pre><code>public class Settings
{
 private static IHttpContextAccessor _HttpContextAccessor;

 public Settings(IHttpContextAccessor httpContextAccessor)
 {
 _HttpContextAccessor = httpContextAccessor;
 }

 public static void Configure(IHttpContextAccessor httpContextAccessor)
 {
 _HttpContextAccessor = httpContextAccessor;
 }

 public static IConfigurationBuilder Getbuilder()
 {
 var builder = new ConfigurationBuilder()
 .SetBasePath(Directory.GetCurrentDirectory())
 .AddJsonFile("appsettings.json");
 return builder;
 }

 public static string GetAppSetting(string key)
 {
 //return Convert.ToString(ConfigurationManager.AppSettings[key]);
 var builder = Getbuilder();
 var GetAppStringData = builder.Build().GetValue&lt;string&gt;("AppSettings:" + key);
 return GetAppStringData;
 }

 public static string GetConnectionString(string key="DefaultName")
 {
 var builder = Getbuilder();
 var ConnectionString = builder.Build().GetValue&lt;string&gt;("ConnectionStrings:"+key);
 return ConnectionString;
 }
}
</code></pre>

Here I have created one class to get connection string and app settings.

I Startup.cs file you need to register class as below.

<pre><code>public class Startup
{

 public void Configure(IApplicationBuilder app, IHostingEnvironment env)
 {
 var httpContextAccessor = app.ApplicationServices.GetRequiredService&lt;IHttpContextAccessor&gt;();
 Settings.Configure(httpContextAccessor);
 }
}
</code></pre>

blocks|key|4485397|text|随着netcoreapp+3.1最新版本的发布，您可以非常简单地做到这一点，而不需要任何第三方依赖。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4485398|I+created+a+gist+for+this，但是您可以使用这个类来读取JSON文件并返回动态属性。|offset|length|4485399|using+System.Text.Json;
using+System.IO;

class+ConfigurationLoader
{

++++private+dynamic+configJsonData;
++++public+ConfigurationLoader+Load(string+configFilePath+=+"appsettings.json")
++++{
++++++++var+appSettings+=+File.ReadAllText(configFilePath);
++++++++this.configJsonData+=+JsonSerializer.Deserialize(appSettings,+typeof(object));
++++++++return+this;
++++}

++++public+dynamic+GetProperty(string+key)
++++{
++++++++var+properties+=+key.Split(".");
++++++++dynamic+property+=+this.configJsonData;
++++++++foreach+(var+prop+in+properties)
++++++++{
++++++++++++property+=+property.GetProperty(prop);
++++++++}

++++++++return+property;
++++}
}|code-block|syntax|javascript|4485400|我特意这样做，以便可以在我的dotnet控制台应用程序中使用appconfig.json。我只是在我的Program.Main函数中添加了以下内容：|style|CODE|4485401|var+config+=+new+ConfigurationLoader();
config.Load();
Console.WriteLine(config.GetProperty("Environment.Name"));|4485402|这将为该属性返回一个dynamic对象。(如果不是原语，则为JsonElement+)。我的appsettings.json文件如下所示：|4485403|{
++"Environment":+{
++++"Token":+"abc-123",
++++"Name":+"Production"
++}
}|4485404|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/EyeOfMidas/26d2783a7b3eefb80f9654c1b7ebee5f^0|0|2|N|0|0|0|1F|C|0|0|A|7|1A|G|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@$D|14|E|15|1|16]]|A|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|18|8|@$D|19|E|1A|M|N]]|9|@]|A|$]]|$1|O|3|P|5|H|7|1B|8|@]|9|@]|A|$I|J]]|$1|Q|3|R|5|6|7|1C|8|@$D|1D|E|1E|M|N]|$D|1F|E|1G|M|N]]|9|@]|A|$]]|$1|S|3|T|5|H|7|1H|8|@]|9|@]|A|$I|J]]|$1|U|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]]]

With the latest iteration of netcoreapp 3.1 out, you can do this pretty simply without any third-party dependencies.

I <a href="https://gist.github.com/EyeOfMidas/26d2783a7b3eefb80f9654c1b7ebee5f" rel="nofollow noreferrer">created a gist for this</a>, but you can use this class to read a JSON file and return dynamic properties.

<pre><code>using System.Text.Json;
using System.IO;

class ConfigurationLoader
{

 private dynamic configJsonData;
 public ConfigurationLoader Load(string configFilePath = "appsettings.json")
 {
 var appSettings = File.ReadAllText(configFilePath);
 this.configJsonData = JsonSerializer.Deserialize(appSettings, typeof(object));
 return this;
 }

 public dynamic GetProperty(string key)
 {
 var properties = key.Split(".");
 dynamic property = this.configJsonData;
 foreach (var prop in properties)
 {
 property = property.GetProperty(prop);
 }

 return property;
 }
}
</code></pre>

I specifically made this so I could use an appconfig.json in my dotnet console application. I just put this in my <code>Program.Main</code> function:

<pre><code>var config = new ConfigurationLoader();
config.Load();
Console.WriteLine(config.GetProperty("Environment.Name"));
</code></pre>

And this will return a <code>dynamic</code> object for the property. (A JsonElement if it's not a primitive).
My <code>appsettings.json</code> file looks like this:

<pre><code>{
 "Environment": {
 "Token": "abc-123",
 "Name": "Production"
 }
}
</code></pre>

blocks|key|4484439|text|派对来得太晚了但如果有人发现了这事。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4484440|您可以从Microsoft.Extensions.Configuration调用IConfiguration；|4484441|public+static+IConfiguration+Configuration+{+get;+}
public+static+string+MyAwesomeString+=+Configuration.GetSection("appSettings")["MyAwesomeString"].ToString();|code-block|syntax|javascript|4484442|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|$]]

Super late to the party but if someone finds this out.
You can call IConfiguration from Microsoft.Extensions.Configuration;
<pre><code>public static IConfiguration Configuration { get; }
public static string MyAwesomeString = Configuration.GetSection(&quot;appSettings&quot;)[&quot;MyAwesomeString&quot;].ToString();
</code></pre>

blocks|key|4485470|text|除了Ali's+answer之外，您还必须在构造函数中注入IConfiguration对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4485471|appsettings.js|4485472|{
++"Logging":+{
++++"LogLevel":+{
++++++"Default":+"Information",
++++++"Microsoft":+"Warning",
++++++"Microsoft.Hosting.Lifetime":+"Information"
++++}
++},
++"AllowedHosts":+"*",
++"AppSettings":+{
++++++"ServerUrl":+"some+url"
++}
++
}|code-block|syntax|javascript|4485473|定义AppSettings类|4485474|++++public+class+AppSettings
++++{
++++++++public+string+ServerUrl+{+get;+set;+}
++++}|4485475|Startup.cs|4485476|+public+class+Startup
++++{
++++++++private+readonly+IConfiguration+Configuration;
++++++++public+Startup(IConfiguration+configuration)
++++++++{
++++++++++++Configuration+=+configuration;
++++++++}
++++++++//+This+method+gets+called+by+the+runtime.+Use+this+method+to+add+services+to+the+container.
++++++++//+For+more+information+on+how+to+configure+your+application,+visit+https://go.microsoft.com/fwlink/?LinkID=398940
++++++++public+void+ConfigureServices(IServiceCollection+services)
++++++++{
++++++++++++services.AddControllers();
++++++++++++services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));
++++++++}

++++++++//+This+method+gets+called+by+the+runtime.+Use+this+method+to+configure+the+HTTP+request+pipeline.
++++++++public+void+Configure(IApplicationBuilder+app,+IWebHostEnvironment+env)
++++++++{
++++++++++++...
++++++++}
++++}|4485477|控制器|4485478|++++[Route("api/[controller]")]
++++[ApiController]
++++public+class+AuthenticationController+:+ControllerBase
++++{
++++++++private+readonly+AppSettings+config;

++++++++public+AuthenticationController+(IOptions<AppSettings>+config)
++++++++{
++++++++++++this.config=+config.Value;
++++++++}

++++++++[HttpGet("token")]

++++++++public+ActionResult+Token()
++++++++{
++++++++++var+server=config.ServerUrl;

++++++++}|4485479|适用于.NET+5|4485480|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/67292524/3596441^0|2|C|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|D|3|E|5|6|7|1A|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1B|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1C|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|1D|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|1E|8|@]|9|@]|C|$]]|$1|Q|3|R|5|H|7|1F|8|@]|9|@]|C|$I|J]]|$1|S|3|T|5|6|7|1G|8|@]|9|@]|C|$]]|$1|U|3|V|5|H|7|1H|8|@]|9|@]|C|$I|J]]|$1|W|3|X|5|6|7|1I|8|@]|9|@]|C|$]]|$1|Y|3|-4|5|6|7|1J|8|@]|9|@]|C|$]]]|Z|$10|$5|11|12|13|C|$14|15]]]]

In addition to <a href="https://stackoverflow.com/a/67292524/3596441">Ali's answer</a>, you have to inject the IConfiguration object in constructor:
appsettings.js
<pre class="lang-json prettyprint-override"><code>{
 &quot;Logging&quot;: {
 &quot;LogLevel&quot;: {
 &quot;Default&quot;: &quot;Information&quot;,
 &quot;Microsoft&quot;: &quot;Warning&quot;,
 &quot;Microsoft.Hosting.Lifetime&quot;: &quot;Information&quot;
 }
 },
 &quot;AllowedHosts&quot;: &quot;*&quot;,
 &quot;AppSettings&quot;: {
 &quot;ServerUrl&quot;: &quot;some url&quot;
 }
 
}
</code></pre>
Define AppSettings class
<pre class="lang-cs prettyprint-override"><code> public class AppSettings
 {
 public string ServerUrl { get; set; }
 }
</code></pre>
Startup.cs
<pre class="lang-cs prettyprint-override"><code> public class Startup
 {
 private readonly IConfiguration Configuration;
 public Startup(IConfiguration configuration)
 {
 Configuration = configuration;
 }
 // This method gets called by the runtime. Use this method to add services to the container.
 // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
 public void ConfigureServices(IServiceCollection services)
 {
 services.AddControllers();
 services.Configure&lt;AppSettings&gt;(Configuration.GetSection(&quot;AppSettings&quot;));
 }

 // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
 public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
 {
 ...
 }
 }
</code></pre>
Controller
<pre class="lang-cs prettyprint-override"><code> [Route(&quot;api/[controller]&quot;)]
 [ApiController]
 public class AuthenticationController : ControllerBase
 {
 private readonly AppSettings config;

 public AuthenticationController (IOptions&lt;AppSettings&gt; config)
 {
 this.config= config.Value;
 }

 [HttpGet(&quot;token&quot;)]

 public ActionResult Token()
 {
 var server=config.ServerUrl;

 }
</code></pre>
Works for .NET 5

I have set up my AppSettings data in file appsettings/Config .json like this:

<pre><code>{
 "AppSettings": {
 "token": "1234"
 }
}
</code></pre>

I have searched online on how to read AppSettings values from .json file, but I could not get anything useful.

I tried:

<pre><code>var configuration = new Configuration();
var appSettings = configuration.Get("AppSettings"); // null
var token = configuration.Get("token"); // null
</code></pre>

I know with ASP.NET 4.0 you can do this:

<pre><code>System.Configuration.ConfigurationManager.AppSettings["token"];
</code></pre>

But how do I do this in ASP.NET Core?

How to read AppSettings values from a .json file in ASP.NET Core

Visual Studio

JSON

我在appsettings/Config .json文件中设置了我的AppSettings数据，如下所示：{  "AppSettings": {        "token": "1234"    }}我已经在网上搜索了如何从.json文件中读取AppSettings值，但我找不到任何有用的东西。我试过了：var co...

问如何在ASP.NET内核中从.json文件中读取AppSettings值
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