How to upload a document to SharePoint from an InfoPath form

In a previous article about uploading documents from InfoPath through a SharePoint workflow to a SharePoint Document Library, I wrote code to upload a document from InfoPath to SharePoint.

Since many visitors to BizSupportOnline were having difficulties finding this code and extracting the bits they needed, I’ve decided to isolate the code and write a separate article for it.

The solution described here makes use of an InfoPath form that has a File Attachment control named document and a Button control on it.

Furthermore, it makes use of the InfoPathAttachmentDecoder class described in How to encode and decode a file attachment programmatically by using Visual C# in InfoPath.

To upload a document that has been stored in an attachment field on an InfoPath form to a SharePoint document library named MyDocuments, you can add the following code behind the button control:

// Retrieve the value of the attachment in the InfoPath form
XPathNavigator ipFormNav = MainDataSource.CreateNavigator();
XPathNavigator nodeNav = ipFormNav.SelectSingleNode(
"//my:document", NamespaceManager);

string attachmentValue = string.Empty;
if (nodeNav != null && !String.IsNullOrEmpty(nodeNav.Value))
{
attachmentValue = nodeNav.Value;

// Decode the InfoPath file attachment
InfoPathAttachmentDecoder dec =
new InfoPathAttachmentDecoder(attachmentValue);
string fileName = dec.Filename;
byte[] data = dec.DecodedAttachment;

// Add the file to a document library
using (SPSite site = new SPSite("http://ServerName"))
{
using (SPWeb web = site.OpenWeb())
{
web.AllowUnsafeUpdates = true;
SPFolder docLib = web.Folders["MyDocuments"];
docLib.Files.Add(fileName, data);
web.AllowUnsafeUpdates = false;
web.Close();
}
site.Close();
}
}

Note: You must add a reference to the SharePoint DLL and a using statement for the Microsoft.SharePoint namespace and give the InfoPath form template Full Trust for the code to work.

If you want to upload a document to a SharePoint document library that is located on the same SharePoint site as an InfoPath browser form, you can use one of the two methods described in 2 Ways to retrieve the SharePoint site collection URL of an InfoPath browser form to find the site and get a reference to the SharePoint document library.

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