.net core mvc 路由对应视图设置

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Microsoft.AspNetCore.Mvc.Razor 定义了视图查找位置设定   

internal class RazorViewEngineOptionsSetup : IConfigureOptions<RazorViewEngineOptions>
    {
        public void Configure(RazorViewEngineOptions options)
        {
            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            options.ViewLocationFormats.Add("/Views/{1}/{0}" + RazorViewEngine.ViewExtension);
            options.ViewLocationFormats.Add("/Views/Shared/{0}" + RazorViewEngine.ViewExtension);

            options.AreaViewLocationFormats.Add("/Areas/{2}/Views/{1}/{0}" + RazorViewEngine.ViewExtension);
            options.AreaViewLocationFormats.Add("/Areas/{2}/Views/Shared/{0}" + RazorViewEngine.ViewExtension);
            options.AreaViewLocationFormats.Add("/Views/Shared/{0}" + RazorViewEngine.ViewExtension);
        }
    }

 Microsoft.Extensions.DependencyInjection 此扩展方法

  public static IMvcBuilder AddRazorOptions(
            this IMvcBuilder builder,
            Action<RazorViewEngineOptions> setupAction)
        {
            if (builder == null)
            {
                throw new ArgumentNullException(nameof(builder));
            }

            if (setupAction == null)
            {
                throw new ArgumentNullException(nameof(setupAction));
            }

            builder.Services.Configure(setupAction);
            return builder;
        }

视图地址设置
Microsoft.AspNetCore.Mvc.Razor

RazorViewEngineOptions

//通过 AddRazorOptions 可以设置 RazorViewEngineOptions  具体可以查看此类

ViewLocationExpanders   扩展视图路径

ViewLocationFormats    /Views/Home/Test.cshtml

AreaViewLocationFormats /Areas/Admin/Views/Home/Test.cshtml

PageViewLocationFormats  /Pages/Account/Manage/{0}.cshtml

AreaPageViewLocationFormats  /Pages/Account/Manage/{0}.cshtml

其中ViewLocationExpanders   可以扩展自己的视图地址

1首先是继承此 对象IViewLocationExpander

 2.默认的源代码为我们添加了语言处理视图

3.language 路由参数出现就会根据语言来设置

通过参数和当前计算机的语言来判定

  services.AddMvc().AddViewLocalization();

  context.Values[ValueKey] = CultureInfo.CurrentUICulture.Name;

 "/Views/{1}/en-GB/{0}.cshtml",

"/Views/Shared/{0}.en-GB.cshtml",

 "/Areas/{2}/Views/{1}/en-GB/{0}.cshtml",
  "/Areas/{2}/Views/{1}/en/{0}.cshtml",
  "/Areas/{2}/Views/{1}/{0}.cshtml",
  "/Areas/{2}/Views/Shared/en-GB/{0}.cshtml",
   "/Areas/{2}/Views/Shared/en/{0}.cshtml",
   "/Areas/{2}/Views/Shared/{0}.cshtml", 

 services.Configure<RazorViewEngineOptions>(
                options =>
                {
                    options.ViewLocationExpanders.Add(new LanguageViewLocationExpander(format));
                });

以上就可以为我们衍生出Mobile 扩展 

public class MobileViewLocationExpander : IViewLocationExpander
    {
      

        /// <summary>
        /// Instantiates a new <see cref="LanguageViewLocationExpander"/> instance.
        /// </summary>
        public MobileViewLocationExpander()
            : this(LanguageViewLocationExpanderFormat.Suffix)
        {
        }

        

        /// <inheritdoc />
        public void PopulateValues(ViewLocationExpanderContext context)
        {
         
        }

        /// <inheritdoc />
        public virtual IEnumerable<string> ExpandViewLocations(
            ViewLocationExpanderContext context,
            IEnumerable<string> viewLocations)
        {
            if (context == null)
            {
                throw new ArgumentNullException(nameof(context));
            }

            if (viewLocations == null)
            {
                throw new ArgumentNullException(nameof(viewLocations));
            }

          

            if (!CheckMobile(context))
            {

                return ExpandViewLocationsCore(viewLocations, culture);
            }

            return viewLocations;
        }

     private bool CheckMobile(ViewLocationExpanderContext context)
        {
            string u = context.ActionContext.HttpContext.Request.Headers["user-agent"];
            Regex b = new Regex(@"android.+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino", RegexOptions.IgnoreCase | RegexOptions.Multiline);
            Regex v = new Regex(@"1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(di|rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-", RegexOptions.IgnoreCase | RegexOptions.Multiline);
            if (!(b.IsMatch(u) || v.IsMatch(u.Substring(0, 4))))
            {
                return false;
            }
            return true;
        }

        private IEnumerable<string> ExpandViewLocationsCore(IEnumerable<string> viewLocations, CultureInfo cultureInfo)
        {
            foreach (var location in viewLocations)
            {

               yield return location.Replace("{0}", "{0}.Mobile" );
            }
        }
    }

以上扩展一个简单的mobile 视图就实现了

services.AddMvc().AddRazorOptions(opt =>
{
opt.ViewLocationFormats.Clear();// 清空默认的列表
         opt.ViewLocationExpanders.Add(new MobileViewLocationExpander());
opt.ViewLocationFormats.Add("/视图/{0}" + RazorViewEngine.ViewExtension);
opt.ViewLocationFormats.Add("/视图/{1}-{0}" + RazorViewEngine.ViewExtension);
            });