current community

your communities

more stack exchange communities

Stack Exchange
tour help
stack overflow careers
Take the 2-minute tour ×
Stack Overflow is a question and answer site for professional and enthusiast programmers. It's 100% free, no registration required.
up vote 0 down vote favorite

I am writing a web api2 program that handles sms-contacts. There is a JSON post to the server like this:

{
    "Id":"4",
    "ClientId":"2",
    "NoOfRecipient":"3",
    "Numbers":
    {
        "num1":9898776568,
        "num2":9087674589
    },
    "Msg":"This is a test"
}

and in Server I have a class to handle this JSON as below:

public class SmsData
{
    public int Id { get; set; }
    public int ClientId { get; set; }
    public int NoOfRecipient { get; set; }
    public IEnumerable<Numbers> Numbers { get; set; }
    public string Msg { get; set; }
    public DateTime SentDate { get; set; }
}

public class Numbers{
    public int Id { get; set; }
    public long Number { get; set; }
}

[Table("SmsData")]
public class StoreSmsData
{
    public int Id { get; set; }
    public int ClientId { get; set; }
    public int NoOfRecipient { get; set; }
}

[Table("SmsSentNumbers")]
public class SentNumbers
{
    public int Id { get; set; }
    public int ClientId { get; set; }
    public long Numbers { get; set; }
    public int NumbersId { get; set; }
    public string Msg { get; set; }
    public DateTime SentDate { get; set; }
}

and Controller is:

public HttpResponseMessage Post(SmsData smsData)
{
    SmsHandler smsHandler = new SmsHandler();
    Clients client = smsHandler.GetClient(smsData.ClientId);
    if (client == null)
    {
        return Request.CreateResponse<SmsData>(HttpStatusCode.NotFound, smsData);
    }
    else if (smsData.NoOfRecipient > client.SmsAllowed)
    {
        return Request.CreateResponse<SmsData>(HttpStatusCode.NotAcceptable, smsData);
    }

    StoreSmsData ssd = new StoreSmsData();
    ssd.ClientId = smsData.ClientId;
    ssd.NoOfRecipient = smsData.NoOfRecipient;
    ssd = dbContext.StoreSmsData.Add(ssd);
    dbContext.SaveChanges();

    var response = Request.CreateResponse<StoreSmsData>(HttpStatusCode.Created, ssd);

    SentNumbers sn = new SentNumbers();
    foreach(Numbers num in smsData.Numbers){
        sn.ClientId = smsData.ClientId;
        sn.Msg = smsData.Msg;
        sn.SentDate = smsData.SentDate;
        sn.Numbers = num.Number;
        sn.NumbersId = num.Id;
        dbContext.SentNumbers.Add(sn);
        dbContext.SaveChanges();
    }

    response = Request.CreateResponse<SentNumbers>(HttpStatusCode.Created, sn);
    return response;
}

Now when I access the server it returns this Response Message:

{
    "Message":"An error has occurred.",
    "ExceptionMessage":"Object reference not set to an instance of an object.",
    "ExceptionType":"System.NullReferenceException",
    "StackTrace":"   at System.Web.Http.ApiController.<InvokeActionWithExceptionFilters>d__1.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   
    at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__0.MoveNext()"
}

I cannot understand the problem. How can i store the numbers in a different table. Also when I debugged with break point the Numbers and Msg value is null. How can I Store the number.In Client Side the Post is fine...

share|improve this question

1 Answer 1

up vote 1 down vote

I do see your JSON formatting is wrong. Say for example,

WORKING CODE

If you have complex model as follows 

public class SmsData
{
    public int Id { get; set; }
    public IEnumerable<Numbers> SmsNumbers { get; set; }
}

public class Numbers
{
    public int Id { get; set; }
    public long Number { get; set; }
}

Then your Action is in the following way - 

    public void Post(SmsData client)
    {
    }

Then you need to make a JSON call in the following way - 

<script src="~/Scripts/jquery-1.10.2.min.js"></script>
<script>

    function SendSms() {
        var studentData = {
            "Id": 29,
            "SmsNumbers": [{ "Id": 98, "Number" : 123 }, { "Id": 90, "Number" : 130 }]
        };
        $.ajax({
            type: "POST",
            url: "http://localhost:23133/api/values",
            data: JSON.stringify(studentData),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            processData: true,
            success: function (data, status, jqXHR) {
                console.log(data);
                console.log(status);
                console.log(jqXHR);
                alert("success..." + data);
            },
            error: function (xhr) {
                alert(xhr.responseText);
            }
        });
    }
</script>
<input type="submit" onclick="SendSms()" value="Click" />

Observe the child nodes data format - 

    var studentData = {
        "Id": 29,
        "SmsNumbers": [{ "Id": 98, "Number" : 123 }, { "Id": 90, "Number" : 130 }]
    };

Similarly you need to format the nested classes format in JSON. When I debug I got all the values -

enter image description here

share|improve this answer
    
I did as you said but still the Numbers is null in my Post Method ie: SmsData smsData's Numbers Field is Empty... Could you please help with this –  Robz Jan 23 '14 at 11:13
    
@Robz Update my answer with your models. Check it out. –  ramiramilu Jan 23 '14 at 11:31

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.