IViewLocationExpander API

• ExpandViewLocations Razor檢視路徑，檢視引擎會搜尋該路徑.
• PopulateValues 每次呼叫都會填充路由

專案目錄如下所示

建立區域擴充套件器，其實我並不需要多區域，我目前只需要達到一個區域中有多個資料夾進行存放我的檢視.

所以我通過實現IViewLocationExpander進行擴充套件新增我自定義檢視路徑規則即可正如下程式碼片段

 public class MyViewLocationExpander : IViewLocationExpander
  {
    public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context,IEnumerable<string> viewLocations)
    {
      if (context.ControllerName != null && context.ControllerName.StartsWith("App"))
      {
        viewLocations = viewLocations.Concat(
          new[] { $"/Areas/sysManage/Views/App/{context.ControllerName}/{context.ViewName}{RazorViewEngine.ViewExtension}"
              });
        return viewLocations;
      }

      if (context.AreaName != "sysManage") return viewLocations;
      viewLocations = viewLocations.Concat(
        new[] { $"/Areas/sysManage/Views/System/{context.ControllerName}/{context.ViewName}{RazorViewEngine.ViewExtension}"
        });
      return viewLocations;
    }

    public void PopulateValues(ViewLocationExpanderContext context)
    {
    }
  }

在Startup.ConfigureServices 註冊

 public void ConfigureServices(IServiceCollection services) 
    { 
      services.Configure<RazorViewEngineOptions>(o => { 
        o.ViewLocationExpanders.Add(new MyViewLocationExpander()); 
      }); 
      services.AddMvc(); 
    } 

 app.UseEndpoints(endpoints =>
      {
        endpoints.MapRazorPages();
        endpoints.MapAreaControllerRoute(
          name: "sysManage","sysManage",pattern: "{area:exists}/{controller=Home}/{action=Index}/{id?}");
      });

最終路由指向的還是

/SysManage/Controller/Action

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