反序列化JSON会引发TargetInvocationException

Question

My data json format is:

[{"Email":"apatil.558@gmail.com","EmpCode":"10004","MobileNo":"","Name":"Sample Manager Eternus User","Pan":"MMMMM9876M","Photo":null,"message":{"Message":"Success"}}]

So I wrote this class to deserialize it to:

public class EmpDetails
{
    public string Email { get; set; }
    public string EmpCode { get; set; }
    public string MobileNo { get; set; }
    public string Name { get; set; }
    public string Pan { get; set; }
    public string Photo { get; set; }
    public string Message { get; set; }
}

I tried to read it using this code:

private void SihnIn_OnClick(object sender, RoutedEventArgs e)
{
     string uri = "http://xyz.d.in/service1.svc/getUser/MMMMM9876M/10004";
     WebClient webClient = new WebClient();
     webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadStringCompleted);
     webClient.DownloadStringAsync(new Uri(uri));
}

 void DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
  {
     var jsonData = JsonConvert.DeserializeObject<EmpDetails>(e.Result); //Getting Error in this line
     string getEmail = jsonData.Email;
  }

Yet JsonConvert.DeserializeObject<EmpDetails>(e.Result) throws an exception:

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in System.Windows.ni.dll

Additional information: Exception has been thrown by the target of an invocation.

How can I deserialize this JSON?

Answer 1

In the JSON string, the field "message" is not a string, it is an object. You must change the definition of EmpDetails to the following to get it work :

public class EmpDetails
{
    public string Email { get; set; }
    public string EmpCode { get; set; }
    public string MobileNo { get; set; }
    public string Name { get; set; }
    public string Pan { get; set; }
    public object Photo { get; set; }
    public Message message { get; set; }
}

public class Message
{
    public string message { get; set; }
}

Answer 2

may be you have wrong class, it should be:

public class Message
{
    public string Message { get; set; }
}

public class EmpDetails//changed name
{
    public string Email { get; set; }
    public string EmpCode { get; set; }
    public string MobileNo { get; set; }
    public string Name { get; set; }
    public string Pan { get; set; }
    public string Photo { get; set; }//changed type
    public Message message { get; set; }
}

http://json2csharp.com/