在List创建的时候自动加上Rating功能

Rating是SharePoint Server 2010新加入的一个功能，可以在List Settings的General Settings分类中找到。

如果你没有看到这个设置，请先创建一个User Profile Service Application，并且确认Social Features是启用的。如下图所示：

对于管理员来说，只需要轻松的进入List设置页面，点击启用Rating就好了。对于一个开发人员，如果你追求把万事万物都放到你的WSP中，编程的方法就必不可少了。

API中并没有这个功能，因为这个启用功能实在过于复杂，借助Reflector，我从“C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\ISAPI\Microsoft.Office.Server.UserProfiles.dll”中间把中间操作的代码“借鉴”了出来（代码附在最后），这样在项目中就可以方便的使用了。

这样，使用Event Handler，在List创建后，就可以把Rating功能自动启用了。

代码中有2处说明，分别对应代码中2处高亮处：

1. 方法使用问题

代码中方法签名是public static bool EnableRatings(this SPList list, bool repropagate) ，并且是放在一个静态类中的，可是引用的时候却是properties.List.EnableRatings(true)。

这是因为这里使用了Extension Methods，这样做的好处就是使得代码更加容易被理解。

2. SocialRatingManager的问题。

在Event Handler中，由于没有办法得到当前的SPContext或者SPServiceContext，所以要处理这个异常，创建一个特定的SocialRatingManager。

Enjoy SharePoint 2010！

Event Handler代码如下：

    public class ListEventReceiver : SPListEventReceiver
    {
        /// <summary>
        /// A list was added.
        /// </summary>
        public override void ListAdded(SPListEventProperties properties)
        {
            properties.List.EnableRatings(true);
            base.ListAdded(properties);
        }
    }

需要引用的Namespace：

using Microsoft.SharePoint;
using Microsoft.SharePoint.Security;
using System.Security.Permissions;
using Microsoft.Office.Server.SocialData;

核心类代码如下：

    public static class SPListUtilities
    {
        public static bool EnableRatings(this SPList list, bool repropagate)
        {
            if (list == null)
            {
                throw new ArgumentNullException("list");
            }
            bool flag = ContainsFieldById(RatingsFeatureConstants.RatingsFieldGuid_AverageRating, list.Fields);
            bool flag2 = ContainsFieldById(RatingsFeatureConstants.RatingsFieldGuid_RatingCount, list.Fields);
            bool flag3 = DoAllContentTypesContainField(RatingsFeatureConstants.RatingsFieldGuid_AverageRating, list.ContentTypes, true, true);
            bool flag4 = DoAllContentTypesContainField(RatingsFeatureConstants.RatingsFieldGuid_RatingCount, list.ContentTypes, true, true);
            bool flag5 = DoesViewContainField(RatingsFeatureConstants.RatingsFieldGuid_AverageRating, list.DefaultView, list);
            bool flag6 = DoesViewContainField(RatingsFeatureConstants.RatingsFieldGuid_RatingCount, list.DefaultView, list);
            if ((flag3 && flag4) && (flag5 && flag6))
            {
                return true;
            }
            if (flag || flag2)
            {
                DisableRatings(list);
            }
            RatingsUtility.EnsureRatingsFieldsForList(list);
            if (repropagate)
            {
                SocialRatingManager srm;
                try
                {
                    srm = new SocialRatingManager(SPServiceContext.Current);
                }
                catch (ArgumentNullException)
                {
                    //If called by an event handler, the SPServiceContext.Current would be null, need to Impersonate SPServiceContext
                    srm = new SocialRatingManager(SPServiceContext.GetContext(list.ParentWeb.Site));
                }
                
                string baseUrl = list.ParentWeb.Url;
                if (baseUrl.EndsWith("/", StringComparison.OrdinalIgnoreCase))
                {
                    baseUrl = baseUrl.TrimEnd(new char[] { '/' });
                }
                foreach (SPListItem item in list.Items)
                {
                    string itemUrl = item.Url;
                    if (itemUrl.StartsWith("/", StringComparison.OrdinalIgnoreCase))
                    {
                        itemUrl = itemUrl.TrimStart(new char[] { '/' });
                    }
                    SPSecurity.RunWithElevatedPrivileges(delegate
                    {
                        srm.PropagateRating(new Uri(baseUrl + "/" + itemUrl));
                    });
                }
            }
            return false;
        }

        public static void DisableRatings(this SPList list)
        {
            SPField fieldById = GetFieldById(RatingsFeatureConstants.RatingsFieldGuid_AverageRating, list.Fields);
            if (fieldById != null)
            {
                list.Fields.Delete(fieldById.InternalName);
            }
            SPField field2 = GetFieldById(RatingsFeatureConstants.RatingsFieldGuid_RatingCount, list.Fields);
            if (field2 != null)
            {
                list.Fields.Delete(field2.InternalName);
            }
            list.Update();
        }

        [SharePointPermission(SecurityAction.LinkDemand, ObjectModel = true)]
        internal static bool ContainsFieldById(Guid id, SPFieldCollection fieldColl)
        {
            if (GetFieldById(id, fieldColl) == null)
            {
                return false;
            }
            return true;
        }

        private static bool DoAllContentTypesContainField(Guid id, SPContentTypeCollection contentTypes, bool excludeFolderContentTypes, bool dontExcludeDocumentSetContentTypes)
        {
            SPContentTypeId id2 = new SPContentTypeId("0x0120");
            SPContentTypeId id3 = new SPContentTypeId("0x0120D520");
            foreach (SPContentType type in contentTypes)
            {
                if ((excludeFolderContentTypes && (type.Id.Equals(id2) || type.Id.IsChildOf(id2))) && (!dontExcludeDocumentSetContentTypes || (!type.Id.Equals(id3) && !type.Id.IsChildOf(id3))))
                {
                    continue;
                }
                if (!ContainsFieldById(id, type.Fields))
                {
                    return false;
                }
            }
            return true;
        }

        private static bool DoesViewContainField(Guid id, SPView view, SPList list)
        {
            string internalFieldName = GetInternalFieldName(id, list);
            if (internalFieldName != null)
            {
                foreach (string str2 in view.ViewFields)
                {
                    if (str2 == internalFieldName)
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        private static string GetInternalFieldName(Guid id, SPList list)
        {
            SPField fieldById = GetFieldById(id, list.Fields);
            if (fieldById != null)
            {
                return fieldById.InternalName;
            }
            foreach (SPContentType type in list.ContentTypes)
            {
                fieldById = GetFieldById(id, type.Fields);
                if (fieldById != null)
                {
                    return fieldById.InternalName;
                }
            }
            return null;
        }

        [SharePointPermission(SecurityAction.LinkDemand, ObjectModel = true)]
        private static SPField GetFieldById(Guid id, SPFieldCollection fieldColl)
        {
            try
            {
                return fieldColl[id];
            }
            catch (ArgumentException)
            {
                return null;
            }
        }

    }

    internal sealed class RatingsFeatureConstants
    {
        // Fields
        public const string EmptyIconUrl_Name = "Ratings_EmptyIconUrl";
        public const string EmptyIconUrl_Value = "/_layouts/Images/RatingsEmpty.png";
        public const string FeatureActivated_False_Value = "false";
        public const string FeatureActivated_Name = "Ratings_FeatureActivated";
        public const string FeatureActivated_True_Value = "true";
        public const string ImageStripRtlUrl_Name = "Ratings_ImageStripRtlUrl";
        public const string ImageStripRtlUrl_Value = "/_layouts/Images/Ratingsrtl.png";
        public const string ImageStripUrl_Name = "Ratings_ImageStripUrl";
        public const string ImageStripUrl_Value = "/_layouts/Images/Ratings.png";
        public const string LoadingImg = @"<img src=\'/_layouts/images/loading16.gif\'> ";
        public const string NewRatingIconUrl_Name = "Ratings_NewRatingIconUrl";
        public const string NewRatingIconUrl_Value = "/_layouts/Images/RatingsNew.png";
        public static readonly Guid RatingsFieldGuid_AverageRating = new Guid("5a14d1ab-1513-48c7-97b3-657a5ba6c742");
        public static readonly Guid RatingsFieldGuid_FeatureId = new Guid("915c240e-a6cc-49b8-8b2c-0bff8b553ed3");
        public static readonly Guid RatingsFieldGuid_RatingCount = new Guid("b1996002-9167-45e5-a4df-b2c41c6723c7");

        // Methods
        private RatingsFeatureConstants()
        {
        }
    }

    [SharePointPermission(SecurityAction.LinkDemand, ObjectModel = true)]
    internal static class RatingsUtility
    {
        // Methods
        public static void EnsureRatingsFieldsForList(SPList list)
        {
            if (list == null)
            {
                throw new ArgumentNullException("list");
            }
            SPFieldCollection fields = list.Fields;
            SPFieldCollection availableFields = list.ParentWeb.AvailableFields;
            if (!fields.Contains(FieldId.AverageRatings))
            {
                SPField field = availableFields[FieldId.AverageRatings];
                list.Fields.AddFieldAsXml(field.SchemaXmlWithResourceTokens, true, SPAddFieldOptions.AddFieldToDefaultView | SPAddFieldOptions.AddFieldInternalNameHint | SPAddFieldOptions.AddToAllContentTypes);
            }
            if (!fields.Contains(FieldId.RatingsCount) && availableFields.Contains(FieldId.RatingsCount))
            {
                SPField field2 = availableFields[FieldId.RatingsCount];
                list.Fields.AddFieldAsXml(field2.SchemaXmlWithResourceTokens, false, SPAddFieldOptions.AddFieldInternalNameHint | SPAddFieldOptions.AddToAllContentTypes);
            }
            list.Update();
        }
    }

    [SharePointPermission(SecurityAction.LinkDemand, ObjectModel = true)]
    public sealed class FieldId
    {
        // Methods
        private FieldId()
        {
        }

        // Properties
        public static Guid AnonymousCacheProfile
        {
            get
            {
                return new Guid("BD51BBE5-9A06-4195-B385-E04FE47A33C8");
            }
        }

        public static Guid ArticleDate
        {
            get
            {
                return new Guid("71316CEA-40A0-49f3-8659-F0CEFDBDBD4F");
            }
        }

        public static Guid AssociatedContentType
        {
            get
            {
                return new Guid("b510aac1-bba3-4652-ab70-2d756c29540f");
            }
        }

        public static Guid AssociatedVariations
        {
            get
            {
                return new Guid("d211d750-4fe6-4d92-90e8-eb16dff196c8");
            }
        }

        public static Guid AudienceTargeting
        {
            get
            {
                return new Guid("61cbb965-1e04-4273-b658-eedaa662f48d");
            }
        }

        public static Guid AuthenticatedCacheProfile
        {
            get
            {
                return new Guid("9A36D6C6-F7D4-4cce-8923-AD99A44E2F5B");
            }
        }

        public static Guid AutomaticUpdate
        {
            get
            {
                return new Guid("e977ed93-da24-4fcc-b77d-ac34eea7288f");
            }
        }

        public static Guid AverageRatings
        {
            get
            {
                return new Guid("5a14d1ab-1513-48c7-97b3-657a5ba6c742");
            }
        }

        public static Guid ByLine
        {
            get
            {
                return new Guid("D3429CC9-ADC4-439b-84A8-5679070F84CB");
            }
        }

        public static Guid CacheAllowWriters
        {
            get
            {
                return new Guid("773ED051-58DB-4ff2-879B-08B21AB001E0");
            }
        }

        public static Guid CacheAuthenticatedUse
        {
            get
            {
                return new Guid("0A90B5E8-185A-4dec-BF3C-E60AAE08373F");
            }
        }

        public static Guid CacheCacheability
        {
            get
            {
                return new Guid("18f165be-6285-4a57-b3ab-4e9f913d299f");
            }
        }

        public static Guid CacheCheckForChanges
        {
            get
            {
                return new Guid("5b4d927c-d383-496b-bc79-1e61bd383019");
            }
        }

        public static Guid CacheDisplayDescription
        {
            get
            {
                return new Guid("9550e77a-4d10-464f-bc0c-102d5b1aec42");
            }
        }

        public static Guid CacheDisplayName
        {
            get
            {
                return new Guid("983f490b-fc53-4820-9354-e8de646b4b82");
            }
        }

        public static Guid CacheDuration
        {
            get
            {
                return new Guid("bdd1b3c3-18db-4acf-a963-e70ef4227fbc");
            }
        }

        public static Guid CacheEnabled
        {
            get
            {
                return new Guid("d8f18167-7cff-4c4e-bdbe-e7b0f01678f3");
            }
        }

        public static Guid CachePerformAclCheck
        {
            get
            {
                return new Guid("db03cb99-cf1e-40b8-adc7-913f7181dac3");
            }
        }

        public static Guid CacheVaryByCustom
        {
            get
            {
                return new Guid("4689a812-320e-4623-aab9-10ad68941126");
            }
        }

        public static Guid CacheVaryByHeader
        {
            get
            {
                return new Guid("89587dfd-b9ca-4fae-8eb9-ba779e917d48");
            }
        }

        public static Guid CacheVaryByParam
        {
            get
            {
                return new Guid("b8abfc64-c2bd-4c88-8cef-b040c1b9d8c0");
            }
        }

        public static Guid CacheVaryByRights
        {
            get
            {
                return new Guid("d4a6af1d-c6d7-4045-8def-cefa25b9ec30");
            }
        }

        public static Guid Contact
        {
            get
            {
                return new Guid("aea1a4dd-0f19-417d-8721-95a1d28762ab");
            }
        }

        public static Guid ContentType
        {
            get
            {
                return SPBuiltInFieldId.ContentType;
            }
        }

        public static Guid ContentTypeId
        {
            get
            {
                return SPBuiltInFieldId.ContentTypeId;
            }
        }

        public static Guid CreatedBy
        {
            get
            {
                return SPBuiltInFieldId.Author;
            }
        }

        public static Guid CreatedDate
        {
            get
            {
                return SPBuiltInFieldId.Created;
            }
        }

        public static Guid DeclaredRecord
        {
            get
            {
                return new Guid("F9A44731-84EB-43a4-9973-CD2953AD8646");
            }
        }

        public static Guid Description
        {
            get
            {
                return SPBuiltInFieldId.Comments;
            }
        }

        public static Guid DocumentId
        {
            get
            {
                return new Guid("AE3E2A36-125D-45d3-9051-744B513536A6");
            }
        }

        public static Guid DocumentIdPersistId
        {
            get
            {
                return new Guid("C010D384-479C-494f-968C-C413DBE3DE29");
            }
        }

        public static Guid DocumentIdUrl
        {
            get
            {
                return new Guid("3B63724F-3418-461f-868B-7706F69B029C");
            }
        }

        public static Guid ExemptFromPolicy
        {
            get
            {
                return new Guid("B0227F1A-B179-4D45-855B-A18F03706BCB");
            }
        }

        public static Guid ExpirationDate
        {
            get
            {
                return new Guid("ACD16FDF-052F-40F7-BB7E-564C269C9FBC");
            }
        }

        public static Guid ExpirationDateSaved
        {
            get
            {
                return new Guid("74E6AE8A-0E3E-4DCB-BBFF-B5A016D74D64");
            }
        }

        public static Guid ExpiryDate
        {
            get
            {
                return new Guid("a990e64f-faa3-49c1-aafa-885fda79de62");
            }
        }

        public static Guid HeaderStylesDefinitions
        {
            get
            {
                return new Guid("a932ec3f-94c1-48b1-b6dc-41aaa6eb7e54");
            }
        }

        public static Guid Hidden
        {
            get
            {
                return new Guid("7581e709-5d87-42e7-9fe6-698ef5e86dd3");
            }
        }

        public static Guid HoldRecordStatus
        {
            get
            {
                return new Guid("3AFCC5C7-C6EF-44f8-9479-3561D72F9E8E");
            }
        }

        public static Guid IconOverlay
        {
            get
            {
                return new Guid("B77CDBCF-5DCE-4937-85A7-9FC202705C91");
            }
        }

        public static Guid IsLocked
        {
            get
            {
                return new Guid("740931E6-D79E-44a6-A752-A06EB23C11B0");
            }
        }

        public static Guid LastModifiedBy
        {
            get
            {
                return SPBuiltInFieldId.Editor;
            }
        }

        public static Guid LastModifiedDate
        {
            get
            {
                return SPBuiltInFieldId.Modified;
            }
        }

        public static Guid LocalContactEmail
        {
            get
            {
                return new Guid("c79dba91-e60b-400e-973d-c6d06f192720");
            }
        }

        public static Guid LocalContactImage
        {
            get
            {
                return new Guid("dc47d55f-9bf9-494a-8d5b-e619214dd19a");
            }
        }

        public static Guid LocalContactName
        {
            get
            {
                return new Guid("7546ad0d-6c33-4501-b470-fb3003ca14ba");
            }
        }

        public static Guid MigratedGuid
        {
            get
            {
                return new Guid("75bed596-0661-4edd-9724-1d607ab8d3b5");
            }
        }

        public static Guid NotificationListDeliveryDate
        {
            get
            {
                return new Guid("E5BD81F1-C408-4abe-84E6-2119D568361E");
            }
        }

        public static Guid NotificationListUrl
        {
            get
            {
                return new Guid("789A7435-9C89-4d65-A472-D386ABA0EDF4");
            }
        }

        public static Guid PageLayout
        {
            get
            {
                return new Guid("0f800910-b30d-4c8f-b011-8189b2297094");
            }
        }

        public static Guid PreviewImage
        {
            get
            {
                return new Guid("188ce56c-61e0-4d2a-9d3e-7561390668f7");
            }
        }

        public static Guid PublishedLinksDescription
        {
            get
            {
                return new Guid("92BBA27E-EEF6-41aa-B728-6DD9CAF2BDE2");
            }
        }

        public static Guid PublishedLinksDisplayName
        {
            get
            {
                return new Guid("C80F535B-A430-4273-8F4F-F3E95507B62A");
            }
        }

        public static Guid PublishedLinksUrl
        {
            get
            {
                return new Guid("70B38565-A310-4546-84A7-709CFDC140CF");
            }
        }

        public static Guid PublishingImageCaption
        {
            get
            {
                return new Guid("66F500E9-7955-49ab-ABB1-663621727D10");
            }
        }

        public static Guid PublishingPageContent
        {
            get
            {
                return new Guid("F55C4D88-1F2E-4ad9-AAA8-819AF4EE7EE8");
            }
        }

        public static Guid PublishingPageIcon
        {
            get
            {
                return new Guid("3894ec3f-4674-4924-a440-8872bec40cf9");
            }
        }

        public static Guid PublishingPageImage
        {
            get
            {
                return new Guid("3de94b06-4120-41a5-b907-88773e493458");
            }
        }

        public static Guid RatingsCount
        {
            get
            {
                return new Guid("b1996002-9167-45e5-a4df-b2c41c6723c7");
            }
        }

        public static Guid RedirectURL
        {
            get
            {
                return new Guid("AC57186E-E90B-4711-A038-B6C6A62A57DC");
            }
        }

        public static Guid ReusableHtml
        {
            get
            {
                return new Guid("82dd22bf-433e-4260-b26e-5b8360dd9105");
            }
        }

        public static Guid ReusableText
        {
            get
            {
                return new Guid("890e9d41-5a0e-4988-87bf-0fb9d80f60df");
            }
        }

        public static Guid ReusableTextType
        {
            get
            {
                return new Guid("3a4b7f98-8d14-4800-8bf5-9ad1dd6a82ee");
            }
        }

        public static Guid RollupImage
        {
            get
            {
                return new Guid("543BC2CF-1F30-488e-8F25-6FE3B689D9AC");
            }
        }

        public static Guid ShowInRibbon
        {
            get
            {
                return new Guid("32E03F99-6949-466a-A4A6-057C21D4B516");
            }
        }

        public static Guid SpsDescription
        {
            get
            {
                return new Guid("631ab9cc-6687-488d-ab1d-a65b364a0d44");
            }
        }

        public static Guid StartDate
        {
            get
            {
                return new Guid("51d39414-03dc-4bd0-b777-d3e20cb350f7");
            }
        }

        public static Guid SummaryAudience
        {
            get
            {
                return new Guid("5f667e57-afc0-44e9-a33f-292b69060e8a");
            }
        }

        public static Guid SummaryGroup
        {
            get
            {
                return new Guid("d42659b5-ded6-41da-a941-c66e06f0e574");
            }
        }

        public static Guid SummaryIcon
        {
            get
            {
                return new Guid("897e4d29-edcf-42a4-951c-b6dbd6d1701f");
            }
        }

        public static Guid SummaryImage
        {
            get
            {
                return new Guid("366ec12a-7e06-48fb-97d3-6d3094b3dcc2");
            }
        }

        public static Guid SummaryLinks
        {
            get
            {
                return new Guid("B3525EFE-59B5-4f0f-B1E4-6E26CB6EF6AA");
            }
        }

        public static Guid SummaryLinks2
        {
            get
            {
                return new Guid("27761311-936A-40ba-80CD-CA5E7A540A36");
            }
        }

        public static Guid TargetItemId
        {
            get
            {
                return new Guid("c546204c-9a88-41d9-913c-ad32cff7dc73");
            }
        }

        public static Guid Title
        {
            get
            {
                return SPBuiltInFieldId.Title;
            }
        }

        public static Guid VariationGroupId
        {
            get
            {
                return new Guid("914fdb80-7d4f-4500-bf4c-ce46ad7484a4");
            }
        }

        public static Guid VariationRelationshipLink
        {
            get
            {
                return new Guid("766da693-38e5-4b1b-997f-e830b6dfcc7b");
            }
        }

        // Nested Types
        internal static class Legacy
        {
            // Properties
            public static Guid ImageDimension
            {
                get
                {
                    return new Guid("664151A8-54FF-434c-A59A-401D3A00DD79");
                }
            }

            public static Guid ImageHeight
            {
                get
                {
                    return new Guid("ABB77A79-8021-405c-8BD1-45403FD6CF98");
                }
            }

            public static Guid ImageWidth
            {
                get
                {
                    return new Guid("FE5429DC-CD77-4dc4-B24C-C82105AE3B36");
                }
            }

            public static Guid Thumbnail
            {
                get
                {
                    return new Guid("BCDE52EA-BD4F-4a2a-9F50-3224D3BD2778");
                }
            }
        }
    }