ASP.NET Core WebAPI实现本地化(单资源文件)

在startup configureservices 注册本地化所需要的服务addlocalization和 configure<requestlocalizationoptions>

 public void configureservices(iservicecollection services)
  {
   services.addlocalization();
   services.configure<requestlocalizationoptions>(options =>
   {
    var supportedcultures = new list<cultureinfo>
    {
     new cultureinfo("en-us"),
     new cultureinfo("zh-cn")
    };

    options.defaultrequestculture = new requestculture(culture: "en-us", uiculture: "en-us");
    options.supportedcultures = supportedcultures;
    options.supporteduicultures = supportedcultures;
    options.requestcultureproviders = new irequestcultureprovider[] { new routedatarequestcultureprovider { indexofculture = 1, indexofuiculture = 1 } };
   });
   services.configure<routeoptions>(options =>
   {
    options.constraintmap.add("culture", typeof(languagerouteconstraint));
   });
   services.addcontrollers();
  }

在startup.cs类的configure 方法中添加请求本地化中间件。

 var localizeoptions = app.applicationservices.getservice<ioptions<requestlocalizationoptions>>();
   app.userequestlocalization(localizeoptions.value);

requestcultureprovider 它使用简单的委托来确定当前的本地化区域性，当然我们还可以通过requestcultureprovider自定义源的请求区域信息比如说配置文件或者数据库都是可以的.或者说我们可以选用默认的一些方式让我们去获取到当前区域.

asp.net core 本地化默认向我们提供了四个方式，可用于确定正在执行的请求的当前区域性：

• querystringrequestcultureprovider
• cookierequestcultureprovider
• acceptlanguageheaderrequestcultureprovider
• customrequestcultureprovider

如下所示我将通过路由的方式,去确定当前区域

public class routedatarequestcultureprovider : requestcultureprovider
 {
  public int indexofculture;
  public int indexofuiculture;

  public override task<providercultureresult> determineprovidercultureresult(httpcontext httpcontext)
  {
   if (httpcontext == null)
    throw new argumentnullexception(nameof(httpcontext));
   string uiculture;

   string culture = uiculture = httpcontext.request.path.value.split('/')[indexofculture];

   var providerresultculture = new providercultureresult(culture, uiculture);

   return task.fromresult(providerresultculture);
  }
 }

通过如下代码片段实现irouteconstraint对路由做相应的约束

 public class languagerouteconstraint : irouteconstraint
 {
  public bool match(httpcontext httpcontext, irouter route, string routekey, routevaluedictionary values, routedirection routedirection)
  {

   if (!values.containskey("culture"))
    return false;

   var culture = values["culture"].tostring();
   return culture == "en-us" || culture == "zh-cn";
  }
 }

添加区域资源文件

注入istringlocalizer<t>，stringlocalizer将通过传递的共享资源(t)的值映射到资源文件,然后将本地化根据字符串的名称从资源文件返回响应的值

 [route("{culture:culture}/[controller]")]
 [apicontroller]
 public class homecontroller : controllerbase
 {
  private readonly istringlocalizer<resource> localizer;
  public homecontroller(istringlocalizer<resource> localizer)
  {
   this.localizer = localizer;
  }
  public string get()
  {
   return localizer["home"];
  }
 }

如下图所示

reference

https://github.com/hueifeng/blogsample/tree/master/src/localizationsingleresx

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