Setting the content type of a document uploaded to SharePoint Library through CSOM

There might be times when we will have to specify a content type for a file that is programmatically uploaded to a SharePoint library through CSOM. This blog post explains the steps involved in setting the custom content type through CSOM code. In order to set the content type we will be using the ParseAndSetFieldValue method of the list item and set the id of our desired content type to the ContentTypeId property.

The first step is to get the content type if of our content type. This is done by looping through all the content types attached to the library and getting the id of the particular content type.

string serverUrl = "SharePoint Site URL";

     String login = "user name";

            String password = "password";

            string listUrlName = "Library Name";

            string customcontenttypename = "Content Type Name";

 

            ClientContext context = new ClientContext(serverUrl);

           

               var passWord = new SecureString();

                foreach (char c in password.ToCharArray()) passWord.AppendChar(c);

                context.Credentials = new SharePointOnlineCredentials(login, passWord);

           List splist = context.Web.GetList(listUrlName);

             context.Load(splist);

             context.Load(splist.ContentTypes);

             context.ExecuteQuery();

              ContentType ctcustom = null;

foreach (ContentType ct in splist.ContentTypes)

{

if (ct.Name == customcontenttypename)

{

ctcustom = ct;

                               break;

}

}

Then we upload the file to the library

var folder = context.Web.GetFolderByServerRelativeUrl(listUrlName);

context.Load(folder);

var files = folder.Files;

context.Load(files);

       string filepath = @"File Path";

                  

       FileInfo fi = new FileInfo(filepath);

       var fci = new FileCreationInformation

{

Url = fi.Name,

Overwrite = true,

Content = System.IO.File.ReadAllBytes(filepath)

};

 

var file = files.Add(fci);

 

And then we set the content type of our custom content type to ContentTypeId property of the list item attached to the uploaded file

file.ListItemAllFields.ParseAndSetFieldValue("ContentTypeId", ctcustom.Id.ToString());

file.ListItemAllFields.Update();

context.Load(file);  

context.ExecuteQuery();

Setting AlternateCSS URL of SharePoint site from CSOM

With the improvements made to SharePoint client side API  it is possible to update the Alternate CSS property of SPWeb from CSOM code. The property can be updated from .Net CSOM client or from JS or REST. For example to set the alternate CSS from JavaScript,  the following script can be added to a Script Editor  web part on any page in the SharePoint site  in which we want to apply alternate CSS style.

<script>
var clientContext;
var website;

SP.SOD.executeFunc('sp.js', 'SP.ClientContext', OnReady);

function OnReady() {

    clientContext = SP.ClientContext.get_current();
    website = clientContext.get_web();
    website.set_alternateCssUrl('SiteAssets/test.css');
website.update();
    clientContext.executeQueryAsync(OnUpdateSucceeded, onUpdateFailed);
}

function OnUpdateSucceeded () {

}

function onUpdateFailed (sender, args) {

    alert('Error in update ' + args.get_message());
}

</script>

The latest versions CSOM SDK can be downloaded from SharePoint Server 2013 Client Components SDK or SharePoint Online Client Components SDK