How to Get a Video Thumbnail preview image in sharepoint Asset Library

Question

namespace ConsoleApplication3
class Program
static void Main(string[] args)
using (var site = new SPSite("http://contoso/sites/teams"))
using (var web = site.OpenWeb())
var list = web.Lists.TryGetList("Videos");
var videoProperties = new Dictionary<string, object>();
videoProperties["Keywords"] = "Intranet Video";
//videoProperties["AlternateThumbnailUrl"] = "/_layouts/images/preview.jpg";
UploadVideo(list, @"C:\Downloads\Video3.mp4", videoProperties);
public static void UploadVideo(SPList list,string fileName,IDict ionary<string,object> properties)
SPFile file;
using (var fileStream = File.OpenRead(fileName))
var urlOfFile = SPUrlUtility.CombineUrl(list.RootFolder.ServerRelativeUrl, Path.GetFileName(fileName));
file = list.RootFolder.Files.Add(urlOfFile, fileStream, true);
list.Update();
//listid = list.ID.add();
SPListItem listItem = list.GetItemById(file.ListItemAllFields.ID);
//SPListItem listItem = list.GetItems("Video3");
var videoContentType = list.ParentWeb.Site.RootWeb.AvailableContentTypes["Video"];
// listItem["ContentTypeId"] = videoContentType.Id;
foreach (var property in properties)
listItem[property.Key] = property.Value;
listItem.Update();
in this code "SPListItem listItem = list.GetItemById(file.ListItemAllFields.ID); " im getting null reference exception.an i have tried with other line "var listItem = file.ListItemAllFields;" same error.any one help me to get solve this
issue.And how to Get a uploaded video Thumnail image.

Answer 1

Hi,
I did a test with your code in my environment and it works fine.
For a better troubleshooting, I suggest you debug your code step by step. You may need to check if file.ListItemAllFields.ID is valid.
If you want to get video Thumnail image, there is a column named Preview Image URL, the internal name of the field is AlternateThumbnailUrl.
You can get the field value using Sever Object Model like below.
String url = item[“AlternateThumbnailUrl”].ToString();
Here is a similar thread for your reference:
http://social.technet.microsoft.com/Forums/en-US/251974d8-18ac-4ff9-88a2-633b5bd80fce/get-asset-library-column-value-preview-image-url-programmatically?forum=sharepointgeneralprevious
More information about how to get list item using Server Object Model:
http://msdn.microsoft.com/en-us/library/office/ms460897%28v=office.14%29.aspx
Best regards,
Zhengyu Guo
Zhengyu Guo
TechNet Community Support