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

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

来源：https://www.cnblogs.com/yyfh/archive/2020/04/05/12636976.html

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