I'm working on WinForms (C#) to find the ranks and keyword positions in Google and Bing. For this I'm using Newtonsoft.Json.Net2.0.dll
. While I'm running the process it shows the error:
Cannot access child value on Newtonsoft.Json.Linq.JValue.
How can I solve this problem?
public class GoogleSearch
{
public int Search(string siteUrl, string searchExpression, ref string stage)
{
int position = 100;
const string urlTemplate = @"http://ajax.googleapis.com/ajax/services/search/web?v=1.0&rsz=large&safe=active&q={0}&start={1}";
var resultsList = new List<SearchType>();
int[] offsets = { 0, 8, 16, 24, 32, 40, 48 };
foreach (var offset in offsets)
{
var searchUrl = new Uri(string.Format(urlTemplate, searchExpression, offset));
string page = new WebClient().DownloadString(searchUrl);
JObject googleSearch = JObject.Parse(page);
IList<JToken> results = googleSearch["responseData"]["results"].Children().ToList();//here i got the error ...
IList<SearchType> searchResults = new List<SearchType>();
foreach (JToken result in results)
{
SearchType searchResult = JsonConvert.DeserializeObject<SearchType>(result.ToString());
resultsList.Add(searchResult);
}
}
int i = 0;
foreach (SearchType s in resultsList)
{
i = i + 1;
if (s.Url.Contains(siteUrl))
{
position = i;
return position;
}
}
return position;
}
}
This is most likely due to the NewtonSoft library trying to bind an object to non-existant properties. In the line
SearchType searchResult = JsonConvert.DeserializeObject<SearchType>(result.ToString());
the deserialization may be failing due to result containing properties that don't exist in SearchType.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With