Value cannot be Null Parameter Sourc

Question

Hi

I am getting error "Value cannot be Null Parameter Source" - var orderByPublishAt = response.Data.items.OrderBy(x => x.snippet.publishedAt);

var client = new RestClient(".googleapis.com/youtube/v3");
var request = new RestRequest("search", Method.GET);
request.AddParameter("part", "snippet");
request.AddParameter("type", "video");
request.AddParameter("maxResults", 50);
request.AddParameter("channelId", "UCVw");
request.AddParameter("key", "AIzaG8");

var response = client.Execute<YoutubeSearchListResponse>(request);
var orderByPublishAt = response.Data.items.OrderBy(x => x.snippet.publishedAt);

Thanks

Muhammad Imran Ansari · Answer

Hello Ramco, The error "Value cannot be null. Parameter: source" occurs because response.Data or response.Data.items is null, meaning the API response did not return valid data. To fix this, check if response.Data and response.Data.items are null before ordering, using if (response.Data == null || response.Data.items == null) { Console.WriteLine("No data received from YouTube API."); return; } . Also, ensure your API key is valid, the Channel ID is correct, and you haven’t exceeded the API quota. Additionally, check for API errors using if (response.StatusCode != System.Net.HttpStatusCode.OK) { Console.WriteLine($"Error: {response.StatusCode}, {response.ErrorMessage}"); } and print response.Content to inspect the API response. These steps will help identify whether the issue is due to missing data, API failure, or incorrect parameters. Good Luck!

Eliana Blake · Answer

Absolutely, I'd be happy to help clarify the issue you're facing with the "Value cannot be Null Parameter Source" error in your code snippet. The error you're encountering usually occurs when attempting to access a property or call a method on a null object. In your specific code snippet, the error is likely happening because either `response` or `response.Data` is null, thus causing the `NullReferenceException` when attempt to access the `items` property. One approach to handle this would be to first ensure that `response` and `response.Data` are not null before trying to access their properties. You could potentially revise the code like this: var response = client.Execute (request); if (response != null && response.Data != null && response.Data.items != null) { var orderByPublishAt = response.Data.items.OrderBy(x => x.snippet.publishedAt); } else { // Handle the scenario where response or its properties are null } By adding these null checks, you can prevent the code from throwing an exception if any of these objects are null. If you're still facing issues after implementing these checks or if there are other parts of your code causing this error, feel free to provide more details so I can offer further assistance.