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NullReferenceException - File.WriteAllText Xamarin/Android ?

Try the following code

 //file path
var filePath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "RecentHosts.txt");
if (!File.Exists(filePath))
{
    File.Create(filePath);
}

string text = JsonConvert.SerializeObject(new JsonHosts() { hosts = RecentHosts.Values.ToList() });
//write in file
File.WriteAllText(filePath, text);

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