CSOM SharePoint Search API filter files only

Question

Using CSOM Search API is there a way to filter for only files? Something similar to the following ListItem filter would be ideal:

ListItem.FileSystemObjectType.Equals(FileSystemObjectType.File)

Ex use case:

if (item.FileSystemObjectType.Equals(FileSystemObjectType.File))
{
    // do stuff
}

The only thing similar I have found in documentation would be using the filetype Keyword Query Language (KQL) filter:

filetype:docx

I'd like to avoid using that, however, as setting all the possible valid file types feels like a sloppy solution IMO. Thanks for any feedback!

Answer 1

You can use IsDocument managed property to filter out the list items. The search Get API should look like this

http://server/_api/search/query?querytext='QueryText+And+IsDocument:true'

apart from IsDocument managed property you can also use

1. contentclass:STS_ListItem_DocumentLibrary - if you want to search within document libraries only
2. contenttype:CONTENT_TYPE_NAME - if you want to search documents for particular content type.