Hide List Content Type via CSOM

Question

How to programmatically (using CSOM/JSOM) uncheck the Visible checkbox for a content type:

so that the content type (Document Set above) is not anymore visible in FILES > New Document:

In order to verify that the solution would work:

1. Do the change
2. Manually add the content type back and verify that it is shown again.

Answer 1

You need to set uniqueContentTypeOrder on the root folder of the list. Check SP.Folder.uniqueContentTypeOrder property here at msdn. Even though you need to do it in JSOM or CSOM, I will share a server object model code which may help you in resolving this issue:

using (SPSite site = new SPSite("http://aissp2013/sites/t1"))
{
    SPWeb web = site.RootWeb;
    SPList list = web.Lists["Hardware And Sanitary Products"];
    SPFolder folder = list.RootFolder;
    IList<SPContentType> uniqueContentTypeOrder = new List<SPContentType>();
    SPContentTypeCollection listContentTypes = list.ContentTypes;
    foreach (SPContentType ct in listContentTypes)
    {                   
        if (ct.Name == "SanitaryItems")
        {
            uniqueContentTypeOrder.Add(ct);
        }
        else if (ct.Name == "HardwareItems")
        {
            uniqueContentTypeOrder.Add(ct);
        }
    }

    if (uniqueContentTypeOrder.Count > 0)
    {
        folder.UniqueContentTypeOrder = uniqueContentTypeOrder;
    }
    list.Update();               
}

See here for more details.

Answer 2

The following example demonstrates how to accomplish it via CSOM:

/// <summary>
/// Hide the content type from List
/// </summary>
/// <param name="ctx"></param>
/// <param name="listTitle"></param>
/// <param name="ctName">The name of content type to hide</param>
private static void HideContentTypeFromList(ClientContext ctx, string listTitle,string ctName)
{
    var list = ctx.Web.Lists.GetByTitle(listTitle);

    //List Content Types 
    ctx.Load(list, l => l.ContentTypes, l => l.RootFolder.UniqueContentTypeOrder);
    ctx.ExecuteQuery();
    var contentTypeOrder = (from ct in list.ContentTypes where ct.Name != ctName select ct.Id).ToList();
    list.RootFolder.UniqueContentTypeOrder = contentTypeOrder;
    list.RootFolder.Update();
    ctx.ExecuteQuery();
}

Usage

using (var ctx = new ClientContext(webUri))
{
     HideContentTypeFromList(ctx, listTitle, "Workflow Task (SharePoint 2013)");
}