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May 10, 2014

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C#, Code, SharePoint, SharePoint 2013

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SharePoint 2013: Create “Link to a document” programmatically

“Link to a document” file is actually an aspx file that redirects the response, here’s a class to create it.
The link icon is automatically setted according to the url’s “extension”, you can override it using the corresponding parameter.

CLASS:

 public class LinkToDocument { public static readonly Guid g_guidIconOverride = new Guid("{B77CDBCF-5DCE-4937-85A7-9FC202705C91}"); public static readonly string FLD_URL = "URL"; /// <param name="name">file name</param> /// <param name="urlVal">Url del link</param> /// <param name="overrideIcon">file extension for the file icon</param> public static SPListItem CreateLinkToDocumentFile(SPDocumentLibrary list, string name, SPFieldUrlValue urlVal, string overrideIcon = null) { var docType = list.ContentTypes.Cast<SPContentType>().Single(ct => ct.Id.IsChildOf(SPBuiltInContentTypeId.LinkToDocument)); return CreateLinkToDocumentFile(list, docType.Id, name, urlVal, overrideIcon); } public static SPListItem CreateLinkToDocumentFile(SPDocumentLibrary list, SPContentTypeId contentTypeId, string name, SPFieldUrlValue urlVal, string overrideIcon = null) { SPContentType contentType = list.ContentTypes[contentTypeId]; string extension = ""; if (urlVal != null && urlVal.Url != null) extension = Path.GetExtension((urlVal.Url).Trim()).TrimStart(".".ToCharArray()); SPFolder currentFolder = list.RootFolder; SPFileCollection files = currentFolder.Files; string fileUrl = string.Concat(currentFolder.Url, "/", name, ".aspx"); string fileTemplate = "<%@ Assembly Name='{0}' %>\r\n <%@ Register TagPrefix='SharePoint' Namespace='Microsoft.SharePoint.WebControls' Assembly='Microsoft.SharePoint' %>\r\n <%@ Import Namespace='System.IO' %>\r\n <%@ Import Namespace='Microsoft.SharePoint' %>\r\n <%@ Import Namespace='Microsoft.SharePoint.Utilities' %>\r\n <%@ Import Namespace='Microsoft.SharePoint.WebControls' %>\r\n <html>\r\n <head> <meta name='progid' content='SharePoint.Link' /> </head>\r\n <body>\r\n <form id='Form1' runat='server'>\r\n <SharePoint:UrlRedirector id='Redirector1' runat='server' />\r\n </form>\r\n </body>\r\n </html>"; StringBuilder fileContent = new StringBuilder(fileTemplate.Length + 400); fileContent.AppendFormat(fileTemplate, typeof(SPDocumentLibrary).Assembly.FullName); Hashtable properties = new Hashtable(); SPContentTypeId ctId = contentType.Id; properties["ContentTypeId"] = ctId.ToString(); SPFile file = files.Add(fileUrl, new MemoryStream((new UTF8Encoding()).GetBytes(fileContent.ToString())), properties, false, false); SPListItem item = file.Item; item[FLD_URL] = urlVal; if (list.Fields.Contains(g_guidIconOverride)) item[g_guidIconOverride] = string.Concat("|", overrideIcon ?? extension, "|"); item.IconOverlay = "linkoverlay.gif"; item.UpdateOverwriteVersion(); return item; } }

HOW TO USE IT:

 SPFieldUrlValue Url = new SPFieldUrlValue() { Url = "http://google.it", Description = "Google" }; var item = LinkToDocument.CreateLinkToDocumentFile(docLib, "linkFileName", Url, "msg");

Hope this helps 🙂

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