乘风原创程序

  • ASP.NET Core MVC通过IViewLocationExpander扩展视图搜索路径的实现
  • 2020/4/7 9:05:35
  • 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