この記事http://dotnet.dzone.com/news/creating-vcard-action-resultを参照して、VCARD の特定のアクション結果を作成することをテストし、強くお勧めし 
ます
コントローラーコード
public virtual vCardActionResult VCard(int id)
        {
            //
            var requestedPerson = Data.Persons.GetById(id);
            vCard personCard = new vCard();
            personCard.FirstName = requestedPerson.Firstname;
            personCard.LastName = requestedPerson.Lastname;
            personCard.Organization = requestedPerson.Company;
            personCard.JobTitle = requestedPerson.Firstname;
            personCard.Phone = requestedPerson.Phone1;
            personCard.Mobile = requestedPerson.Mobile;
            personCard.Country=  requestedPerson.Site.Name;
            personCard.Address = requestedPerson.Address1 ;
            personCard.Email = requestedPerson.Email1;
            //The template file laid on the root vcard.txt
            return new vCardActionResult(personCard);
        }
カスタム アクションの結果 
public class vCardActionResult : ActionResult
    {
        private vCard _card;
        protected vCardActionResult() { }
        public vCardActionResult(vCard card)
        {
            _card = card;
        }
        public override void ExecuteResult(ControllerContext context)
        {
            var response = context.HttpContext.Response;
            response.ContentType = "text/vcard";
            response.AddHeader("Content-Disposition", "attachment; fileName=" + _card.FirstName + "_" + _card.LastName + ".vcf");
            var cardString = _card.Body();
            var inputEncoding = Encoding.Default;
            var outputEncoding = Encoding.GetEncoding("windows-1257");
            var cardBytes = inputEncoding.GetBytes(cardString);
            var outputBytes = Encoding.Convert(inputEncoding,outputEncoding, cardBytes);
            response.OutputStream.Write(outputBytes, 0, outputBytes.Length);
        }
    }
そして、それはあなたがそれを必要とする場合のクラスです
public class vCard
    {
        public string FirstName = "";
        public string LastName ="";
        public string Organization = "";
        public string JobTitle = "";
        public string Address = "";
        public string Phone = "";
        public string Mobile = "";
        public string Email = "";
        public string Country = "";
        public string Website = "";
        public string Body()
        {
            var cardTemplate = "";
            using (StreamReader sr = new StreamReader(System.Web.HttpContext.Current.Server.MapPath(@"~/vcard.txt")))
            {
                cardTemplate = sr.ReadToEnd();
            }
            cardTemplate = cardTemplate
                .Replace("{{firstname}}", FirstName)
                .Replace("{{lastname}}", LastName)
                .Replace("{{organization}}", Organization)
                .Replace("{{jobtitle}}", JobTitle)
                .Replace("{{workphone}}", Phone)
                .Replace("{{mobilephone}}", Mobile)
                .Replace("{{country}}", Country)
                .Replace("{{address}}", Address)
                .Replace("{{email}}", Email);
            return cardTemplate;
        }
    }
また、必要な場合に備えて、vcard テンプレート テキスト ファイル vcard.txt を次に示します。
BEGIN:VCARD
VERSION:2.1
N;LANGUAGE=en-au:{{lastname}};{{firstname}}
FN:{{firstname}} {{lastname}}
ORG:{{organization}}
TITLE:{{jobtitle}}
TEL;WORK;VOICE:{{workphone}}
TEL;CELL;VOICE:{{mobilephone}}
ADR;WORK;PREF:;;;;{{country}};;{{country}}
LABEL;WORK;PREF:{{address}}
EMAIL;PREF;INTERNET:{{email}}
REV:20140116T013303Z
END:VCARD