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：

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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");
            }
        }
    }
}