Object reference not set to an instance of an object

Question

I've searched through many threads and websites looking for this problem. So far, I haven't been able to find anything wrong with this code.

The "bad" code is this: request.AddComment(v, c);

Also, I don't know what a stack trace is.

Thanks for all your help in advance.

Here is my code:

string devkey = "1"; string username = "2"; string password = "3"; YouTubeRequestSettings a = new YouTubeRequestSettings("test", devkey, username, password); YouTubeRequest request = new YouTubeRequest(a); Uri uri = new Uri("b"); Video v = request.Retrieve<Video>(uri); Comment c = new Comment(); c.Content = "asdf"; request.AddComment(v, c);

Please add the stack trace or at least the line that is having the problem — Lou Franco
– Lou Franco, Commented Jun 28, 2011 at 20:27
Most probanbly in this line Video v = request.Retrieve<Video>(uri); v stays null and on line request.AddComment(v, c); the exception is thrown. Can you check that? — Armen Tsirunyan
– Armen Tsirunyan, Commented Jun 28, 2011 at 20:28

Etienne de Martel · Accepted Answer · 2011-06-28 21:20:27Z

The only way this snippet might throw a NullReferenceException is if request.Retrieve returned null and request.AddComment throws an exception if either parameter is null.

The solution is to test v:

Video v = request.Retrieve<Video>(uri); if(v != null) { Comment c = new Comment(); c.Content = "asdf"; request.AddComment(v, c); } else { // something went wrong when getting the video... }

Jon Raynor · Accepted Answer · 2011-06-28 21:22:40Z

Null check the objects that are being referenced. The video request definately should be checked. Code below does a video null check.

string devkey = "1"; string username = "2"; string password = "3"; YouTubeRequestSettings a = new YouTubeRequestSettings("test", devkey, username, password); YouTubeRequest request = new YouTubeRequest(a); Uri uri = new Uri("b"); Video v = request.Retrieve<Video>(uri); Comment c = new Comment(); c.Content = "asdf"; if (v!= null) { request.AddComment(v, c); } else { //Handle the null, try to get the video again, report to user, etc. }

new cannot return null. Testing request is unnecessary.
My bad, Video should be checked. I've updated the code, Thx for pointing that out.
Thanks, so now I know that v returns null :/ Now all I need to do is try and get it to return something else.

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