Use an object model to create a content type

1. Define a function to create the content type. The Code is as follows:

private SPContentType CreateContentType(SPWeb web, string typeName,string baseTypeName,
string description){    SPContentType contentType = null;    try      {        SPContentType baseType;        if (string.IsNullOrEmpty(baseTypeName))        {            baseType = web.AvailableContentTypes[SPContentTypeId.Empty];        }        else        {            baseType = web.AvailableContentTypes[baseTypeName];        }        contentType = new SPContentType(baseType, web.ContentTypes, typeName);        contentType.Description = description;        web.ContentTypes.Add(contentType);      }    catch    {    }    return contentType;}

2. Define two overloaded functions. Create a website field in the function, and then add fieldlink to the content type.

 private SPField AddField(SPContentType contentType, string fieldDisplayName, 
                                                        SPFieldType fieldType, bool bRequired){   SPField field = null;   try     {       using (SPWeb web = contentType.ParentWeb)       {           web.Fields.Add(fieldDisplayName, fieldType, bRequired);           field = web.Fields[fieldDisplayName];           contentType.FieldLinks.Add(new SPFieldLink(field));       }     }     catch     {     }     return field;}private SPField AddField(SPContentType contentType, string fieldDisplayName,                         SPFieldType fieldType, bool bRequired,                         bool bCompactName, StringCollection choices){     SPField field = null;     try       {                    using (SPWeb web = contentType.ParentWeb)           {              web.Fields.Add(fieldDisplayName, fieldType, bRequired, bCompactName, choices);              field = web.Fields[fieldDisplayName];              // add a field link to the content type              contentType.FieldLinks.Add(new SPFieldLink(field));            }       }       catch       {       }       return field;}

3. The following function adds the content type to a specified Website:

 private void AddContentType(SPWeb web){   if (web != null)   {       web.AllowUnsafeUpdates = true;       SPContentType contentType = CreateContentType(web, "OnlineEvent11", "Event", "OnlineEvent11");       if (contentType != null)       {           StringCollection statusColl = new StringCollection();           statusColl.Add("Approved");           statusColl.Add("Rejected");           AddField(contentType, "Event Status", SPFieldType.Choice,true, false, statusColl);           AddField(contentType, "Number Of Attendees",SPFieldType.Number, false);           StringCollection eventType = new StringCollection();           eventType.Add("Business/Career");           eventType.Add("Classes & Lectures");           eventType.Add("Dinners/Galas");           eventType.Add("Fundraiser");           eventType.Add("Misc");           eventType.Add("Seminars");
           eventType.Add("Support Groups");           AddField(contentType, "Type Of Event", SPFieldType.Choice,true, false, eventType);                    
           StringCollection audienceType = new StringCollection();           audienceType.Add("Adults");           audienceType.Add("Everyones' Invited");           audienceType.Add("Families");           audienceType.Add("Kids");           audienceType.Add("Men");           audienceType.Add("Seniors");           audienceType.Add("Singles");           audienceType.Add("Teens");           audienceType.Add("Women");           AddField(contentType, "Audience Type", SPFieldType.MultiChoice, true, false, audienceType);           contentType.Update(true);       }   }}

4 :.The following code is used in feature:Executed when activated

public override void FeatureActivated(SPFeatureReceiverProperties properties){   if (properties != null)   {      SPWeb web = properties.Feature.Parent as SPWeb;      if (web != null)      {          AddContentType(web);      }   } }

V:Since spfeaturereceiver is an abstract class, the following method must be overwritten.

public override void FeatureDeactivating(SPFeatureReceiverProperties properties){ }public override void FeatureInstalled(SPFeatureReceiverProperties properties){ }public override void FeatureUninstalling(SPFeatureReceiverProperties properties){ }

6. After the deployment is successful, for example: