自定义WebViewPage，实现Url.Action生成绝对地址

前言

运营部门一直对公司官网SEO有意见，认为做得不好(说得好像运营做不好都是seo似的)。为此两部门老大还闹到CEO那去了。

也因为这事，工作计划终于排上日程。沟通一番后得知有如下几点需求：

1.所有链接都得是绝对地址。比如之前是/about.html,现在得变成http://xxx.com/about.html(你妹啊，这样我本地怎么测试)

2.所有目录最后都加/,没有的定久重定向到加/的。比如之前/xxx  ,现在得变成http://xxx.com/xxx/

3.图片必须加alt ,width height 属性

分析编码 

前些天图片问题已经改完了，现在重点是链接。因为项目链接大多走的Url.Action，所以自然的想到得从这入手。  

其实微软已经为我们提供了这个实现，即 @Url.Action("actionName","controllerName","routeValues","protocol","hostName")

全解决方案搜索Url.Action，一千多处。想到前面优化img标签加alt，才五百多处就花了一天半时间，这肯定是不能接受的。

get='_blank'>mvc 不是开源了吗，把源码down下来看看，https://git01.codeplex.com/aspnetwebstack 

分析源码定位到两个核心的类 UrlHelper WebViewPage

 1 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information. 2  3 using System.Diagnostics.CodeAnalysis; 4 using System.Globalization; 5 using System.Web.Mvc.Properties; 6 using System.Web.Routing; 7 using System.Web.WebPages; 8  9 namespace System.Web.Mvc 10 { 11   public class UrlHelper 12   { 13     /// <summary> 14     /// Key used to signify that a route URL generation request should include HTTP routes (e.g. Web API). 15     /// If this key is not specified then no HTTP routes will match. 16     /// </summary> 17     private const string HttpRouteKey = "httproute"; 18  19     /// <summary> 20     /// Initializes a new instance of the <see cref="UrlHelper"/> class. 21     /// </summary> 22     /// <remarks>The default constructor is intended for use by unit testing only.</remarks> 23     public UrlHelper() 24     { 25     } 26  27     public UrlHelper(RequestContext requestContext) 28       : this(requestContext, RouteTable.Routes) 29     { 30     } 31  32     public UrlHelper(RequestContext requestContext, RouteCollection routeCollection) 33     { 34       if (requestContext == null) 35       { 36         throw new ArgumentNullException("requestContext"); 37       } 38       if (routeCollection == null) 39       { 40         throw new ArgumentNullException("routeCollection"); 41       } 42       RequestContext = requestContext; 43       RouteCollection = routeCollection; 44     } 45  46     public RequestContext RequestContext { get; private set; } 47  48     public RouteCollection RouteCollection { get; private set; } 49  50     public virtual string Action() 51     { 52       return RequestContext.HttpContext.Request.RawUrl; 53     } 54  55     public virtual string Action(string actionName) 56     { 57       return GenerateUrl(null /* routeName */, actionName, null, (RouteValueDictionary)null /* routeValues */); 58     } 59  60     public virtual string Action(string actionName, object routeValues) 61     { 62       return GenerateUrl(null /* routeName */, actionName, null /* controllerName */, TypeHelper.ObjectToDictionary(routeValues)); 63     } 64  65     public virtual string Action(string actionName, RouteValueDictionary routeValues) 66     { 67       return GenerateUrl(null /* routeName */, actionName, null /* controllerName */, routeValues); 68     } 69  70     public virtual string Action(string actionName, string controllerName) 71     { 72       return GenerateUrl(null /* routeName */, actionName, controllerName, (RouteValueDictionary)null /* routeValues */); 73     } 74  75     public virtual string Action(string actionName, string controllerName, object routeValues) 76     { 77       return GenerateUrl(null /* routeName */, actionName, controllerName, TypeHelper.ObjectToDictionary(routeValues)); 78     } 79  80     public virtual string Action(string actionName, string controllerName, RouteValueDictionary routeValues) 81     { 82       return GenerateUrl(null /* routeName */, actionName, controllerName, routeValues); 83     } 84  85     public virtual string Action(string actionName, string controllerName, RouteValueDictionary routeValues, string protocol) 86     { 87       return GenerateUrl(null /* routeName */, actionName, controllerName, protocol, null /* hostName */, null /* fragment */, routeValues, RouteCollection, RequestContext, true /* includeImplicitMvcValues */); 88     } 89  90     public virtual string Action(string actionName, string controllerName, object routeValues, string protocol) 91     { 92       return GenerateUrl(null /* routeName */, actionName, controllerName, protocol, null /* hostName */, null /* fragment */, TypeHelper.ObjectToDictionary(routeValues), RouteCollection, RequestContext, true /* includeImplicitMvcValues */); 93     } 94  95     public virtual string Action(string actionName, string controllerName, RouteValueDictionary routeValues, string protocol, string hostName) 96     { 97       return GenerateUrl(null /* routeName */, actionName, controllerName, protocol, hostName, null /* fragment */, routeValues, RouteCollection, RequestContext, true /* includeImplicitMvcValues */); 98     } 99 100     public virtual string Content(string contentPath)101     {102       return GenerateContentUrl(contentPath, RequestContext.HttpContext);103     }104 105     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]106     public static string GenerateContentUrl(string contentPath, HttpContextBase httpContext)107     {108       if (String.IsNullOrEmpty(contentPath))109       {110         throw new ArgumentException(MvcResources.Common_NullOrEmpty, "contentPath");111       }112 113       if (httpContext == null)114       {115         throw new ArgumentNullException("httpContext");116       }117 118       if (contentPath[0] == '~')119       {120         return UrlUtil.GenerateClientUrl(httpContext, contentPath);121       }122       else123       {124         return contentPath;125       }126     }127 128     //REVIEW: Should we have an overload that takes Uri?129     [SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", Justification = "Needs to take same parameters as HttpUtility.UrlEncode()")]130     [SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic", Justification = "For consistency, all helpers are instance methods.")]131     public virtual string Encode(string url)132     {133       return HttpUtility.UrlEncode(url);134     }135 136     private string GenerateUrl(string routeName, string actionName, string controllerName, RouteValueDictionary routeValues)137     {138       return GenerateUrl(routeName, actionName, controllerName, routeValues, RouteCollection, RequestContext, true /* includeImplicitMvcValues */);139     }140 141     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]142     public static string GenerateUrl(string routeName, string actionName, string controllerName, string protocol, string hostName, string fragment, RouteValueDictionary routeValues, RouteCollection routeCollection, RequestContext requestContext, bool includeImplicitMvcValues)143     {144       string url = GenerateUrl(routeName, actionName, controllerName, routeValues, routeCollection, requestContext, includeImplicitMvcValues);145 146       if (url != null)147       {148         if (!String.IsNullOrEmpty(fragment))149         {150           url = url + "#" + fragment;151         }152 153         if (!String.IsNullOrEmpty(protocol) || !String.IsNullOrEmpty(hostName))154         {155           Uri requestUrl = requestContext.HttpContext.Request.Url;156           protocol = (!String.IsNullOrEmpty(protocol)) ? protocol : Uri.UriSchemeHttp;157           hostName = (!String.IsNullOrEmpty(hostName)) ? hostName : requestUrl.Host;158 159           string port = String.Empty;160           string requestProtocol = requestUrl.Scheme;161 162           if (String.Equals(protocol, requestProtocol, StringComparison.OrdinalIgnoreCase))163           {164             port = requestUrl.IsDefaultPort ? String.Empty : (":" + Convert.ToString(requestUrl.Port, CultureInfo.InvariantCulture));165           }166 167           url = protocol + Uri.SchemeDelimiter + hostName + port + url;168         }169       }170 171       return url;172     }173 174     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]175     public static string GenerateUrl(string routeName, string actionName, string controllerName, RouteValueDictionary routeValues, RouteCollection routeCollection, RequestContext requestContext, bool includeImplicitMvcValues)176     {177       if (routeCollection == null)178       {179         throw new ArgumentNullException("routeCollection");180       }181 182       if (requestContext == null)183       {184         throw new ArgumentNullException("requestContext");185       }186 187       RouteValueDictionary mergedRouteValues = RouteValuesHelpers.MergeRouteValues(actionName, controllerName, requestContext.RouteData.Values, routeValues, includeImplicitMvcValues);188 189       VirtualPathData vpd = routeCollection.GetVirtualPathForArea(requestContext, routeName, mergedRouteValues);190       if (vpd == null)191       {192         return null;193       }194 195       string modifiedUrl = UrlUtil.GenerateClientUrl(requestContext.HttpContext, vpd.VirtualPath);196       return modifiedUrl;197     }198 199     [SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "0#", Justification = "Response.Redirect() takes its URI as a string parameter.")]200     public virtual bool IsLocalUrl(string url)201     {202       // TODO this should call the System.Web.dll API once it gets added to the framework and MVC takes a dependency on it.203       return RequestExtensions.IsUrlLocalToHost(RequestContext.HttpContext.Request, url);204     }205 206     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]207     public virtual string RouteUrl(object routeValues)208     {209       return RouteUrl(null /* routeName */, routeValues);210     }211 212     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]213     public virtual string RouteUrl(RouteValueDictionary routeValues)214     {215       return RouteUrl(null /* routeName */, routeValues);216     }217 218     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]219     public virtual string RouteUrl(string routeName)220     {221       return RouteUrl(routeName, (object)null /* routeValues */);222     }223 224     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]225     public virtual string RouteUrl(string routeName, object routeValues)226     {227       return RouteUrl(routeName, routeValues, null /* protocol */);228     }229 230     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]231     public virtual string RouteUrl(string routeName, RouteValueDictionary routeValues)232     {233       return RouteUrl(routeName, routeValues, null /* protocol */, null /* hostName */);234     }235 236     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]237     public virtual string RouteUrl(string routeName, object routeValues, string protocol)238     {239       return GenerateUrl(routeName, null /* actionName */, null /* controllerName */, protocol, null /* hostName */, null /* fragment */, TypeHelper.ObjectToDictionary(routeValues), RouteCollection, RequestContext, false /* includeImplicitMvcValues */);240     }241 242     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]243     public virtual string RouteUrl(string routeName, RouteValueDictionary routeValues, string protocol, string hostName)244     {245       return GenerateUrl(routeName, null /* actionName */, null /* controllerName */, protocol, hostName, null /* fragment */, routeValues, RouteCollection, RequestContext, false /* includeImplicitMvcValues */);246     }247 248     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]249     public virtual string HttpRouteUrl(string routeName, object routeValues)250     {251       return HttpRouteUrl(routeName, TypeHelper.ObjectToDictionary(routeValues));252     }253 254     [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings", Justification = "As the return value will used only for rendering, string return value is more appropriate.")]255     public virtual string HttpRouteUrl(string routeName, RouteValueDictionary routeValues)256     {257       if (routeValues == null)258       {259         // If no route values were passed in at all we have to create a new dictionary260         // so that we can add the extra "httproute" key.261         routeValues = new RouteValueDictionary();262         routeValues.Add(HttpRouteKey, true);263       }264       else265       {266         // Copy the dictionary to add the extra "httproute" key used by all Web API routes to267         // disambiguate them from other MVC routes.268         routeValues = new RouteValueDictionary(routeValues);269         if (!routeValues.ContainsKey(HttpRouteKey))270         {271           routeValues.Add(HttpRouteKey, true);272         }273       }274 275       return GenerateUrl(routeName,276         actionName: null,277         controllerName: null,278         protocol: null,279         hostName: null,280         fragment: null,281         routeValues: routeValues,282         routeCollection: RouteCollection,283         requestContext: RequestContext,284         includeImplicitMvcValues: false);285     }286   }287 }

原标题：自定义WebViewPage，实现Url.Action生成绝对地址

关键词：web