Error sending json to webmethod

Question

1.00/5 (1 vote)

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Hi all,
I am having trouble sending JSON to a WebMethod. Here is the way that I am trying to do it.
If there is a better way to do this please let me know.
What I am trying to do is save the JSON object off in a database.

HTML

<script type="text/javascript">
						
function TEST() {
   var str = {
	'data' : [
       { "id" : "ajson1", "parent" : "#", "text" : "Simple"},
       { "id" : "ajson2", "parent" : "#", "text" : "Root"},
    ]
}

    $.ajax({
        type: "POST",
        url: "Default3.aspx/Test",
        data: str,
        //contentType: "plain/text",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(msg) {
            alert(msg.d);
        },
        error: function(e) {
            alert(e.responseText);
        }
    });
} 
						</script>

Code behind:

  [WebMethod]
    public static string Test(string Object)
    {
        return "success";
       // return "{data:data}";
    }

i got the below error message,

C#

---------------------------
Message from webpage
---------------------------
{"Message":"Invalid JSON primitive: data.","StackTrace":"   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject()\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer)\r\n   at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit)\r\n   at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize[T](String input)\r\n   at System.Web.Script.Services.RestHandler.GetRawParamsFromPostRequest(HttpContext context, JavaScriptSerializer serializer)\r\n   at System.Web.Script.Services.RestHandler.GetRawParams(WebServiceMethodData methodData, HttpContext context)\r\n   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.ArgumentException"}
---------------------------
OK   
---------------------------

thanks in advance.

What I have tried:

Error sending JSON to WebMethod

Posted 25-Feb-16 23:54pm

stellus

Updated 11-Aug-20 3:07am

F-ES Sitecore

v4

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Comments

F-ES Sitecore 26-Feb-16 7:10am

You probably can't use "#" as a property name.

Richard Deeming 26-Feb-16 8:53am

The error suggests there's a mis-match between the JSON you're sending and the structure of the class your WebMethod is trying to deserialize. What does the class look like?

2 solutions

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John C Rayan · Answer 1 · 2016-02-26T00:28:00

Solution 1

Look at this one

jquery - "Invalid JSON primitive" in Ajax processing - Stack Overflow[^]

Posted 26-Feb-16 0:28am

John C Rayan

mehul bhalala · Answer 2 · 2016-02-26T01:59:00

Solution 2

try this code

JavaScript

function TEST() {
        var str =JSON.stringify({

            data: [
                    {
                        id: "ajson1",
                        parent: "#",
                        text: "Simple"
                    },
                   {
                       id: "ajson2",
                       parent: "#",
                       text: "Root"
                   }
                 ]
        }

        $.ajax({
            type: "POST",
            url: "Default3.aspx/Test",
        data: str,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (msg) {
            alert(msg.d);
        },
        error: function (e) {
            alert(e.responseText);
        }
    });
}

Posted 26-Feb-16 1:59am

mehul bhalala

Comments

stellus 27-Feb-16 0:46am

Thank you mehul,
i tried your code but again i got the different error message ,
please find below my error message and webmethod code,

error:
---------------------------
Message from webpage
---------------------------
{"Message":"Invalid web service call, missing value for parameter: \u0027Object\u0027.","StackTrace":" at System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary`2 parameters)\r\n at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)\r\n at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)\r\n at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"}
---------------------------
OK
---------------------------

My WebMethod code is:

[WebMethod]
public static string TEST(string Object)
{
return "success";
// return "{data:data}";
}

thanks in advance