ASP.NET Core MVC通过IViewLocationExpander扩展视图搜索路径的实现

iviewlocationexpander api

• expandviewlocations razor视图路径，视图引擎会搜索该路径.
• populatevalues 每次调用都会填充路由

项目目录如下所示

创建区域扩展器，其实我并不需要多区域，我目前只需要达到一个区域中有多个文件夹进行存放我的视图.

所以我通过实现iviewlocationexpander进行扩展添加我自定义视图路径规则即可正如下代码片段

 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 注册

 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?}");
      });

最终路由指向的还是

/sysmanage/controller/action

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