I am doing the migration of Microsoft Translation, from v2 to v3. But I am getting the following exception:
There was an error deserializing the object of type System.String. The data at the root level is invalid. Line 1, position 1.
(System.Runtime.Serialization.SerializationException)Inner exception: The data at the root level is invalid. Line 1, position 1.
System.Exception {System.Xml.XmlException}
This error happens on this line of code:
translation.Append((string)dcs.ReadObject(response));
Full method:
public string TranslateText(string from, string to, string text)
{
var token = string.Empty;
try
{
retryPolicy.Execute(() =>
{
token = azureAuthentication.GetAccessToken();
});
var translation = new StringBuilder();
int charLength = Configuration.Configuration.CharLength;
List<string> lines = text.Split('.').Aggregate(new[] { "" }.ToList(), (a, x) =>
{
var last = a[a.Count - 1];
if ((last + x).Length > charLength)
{
a.Add(x);
}
else
{
a[a.Count - 1] = ($"{last}{x}.");
}
return a;
});
foreach (var str in lines)
{
string uri =$"https://api.cognitive.microsofttranslator.com/languages?api-version=3.0&scope=translation&textType={HttpUtility.UrlEncode(str)}&from=from_lang&to=to_lang";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(uri);
httpWebRequest.Headers.Add("Authorization", token);
try
{
retryPolicy.Execute(() =>
{
using (var response = httpWebRequest.GetResponse().GetResponseStream())
{
var dcs = new DataContractSerializer(Type.GetType("System.String"));
translation.Append((string)dcs.ReadObject(response));
}
});
}
catch (Exception ex)
{
throw new ExternalServiceUnavailableException(ex.Message, ex);
}
}
return translation.ToString();
}
catch(Exception ex)
{
throw new ExternalServiceUnavailableException(ex.Message, ex);
}
}
I have no idea why this error is occurring. I looked out other questions regarding this error but I am not sure how to implement those resolutions here.
Thank you
I think you're getting an error in your request so the deserialization is failing. I think this part
from=from_lang&to=to_lang
should befrom={from_lang}&to={to_lang}
You're setting to the literal string from_lang, instead of a name of a valid language, like en or es.