Click Event UrlOffset

[noteCe]

Hi,
I want to get click event information. Some click event contains urloffset, some is not. (Ex : https://github.com/mirajavora/sendgrid-webhooks/blob/master/Sendgrid.Webhooks.Tests/Events/click.json )
When event doesn't contain UrlOffset, i'm getting ' Object reference not set to an instance of an object' error.
int clickIndex = clickEvent.UrlOffset.Index; string clickType = clickEvent.UrlOffset.Type;

How can i use Contains() method ?
Like following :
if (clickEvent.Contains("UrlOffset")) { }

Thanks.

[andrewchilcott]

To ensure that you do not get null references, you need to include a null check in a ClickEvent constructor

  public class ClickEvent : EngagementEventBase
   {
       public ClickEvent()
       {
           if (this.UrlOffset == null)
               this.UrlOffset = new UrlOffset();
       }

       [JsonProperty("url")]
       public string Url { get; set; }

       [JsonProperty("url_offset")]
       public UrlOffset UrlOffset { get; set; }
   }