Error during serialization or deserialization using the JSON JavaScriptSerializer.

Question

Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.

public string MemberDetail(string Code)
    {
        String res = "";
        SortedList sd = new SortedList();
        sd.Add("@mode", "MemberDetail");
        sd.Add("@Code", Code);
        SqlDataReader dr = erp.GetDataReaderSP("[Demo]", sd);
        DataTable dt = new DataTable();

        dt.Load(dr);
        Synchr[] obj = new Synchr[dt.Rows.Count];
        if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {

                obj[i].DemoName = Convert.ToInt32(dt.Rows[i]["Name"].ToString());
            }
        }

        return new JavaScriptSerializer().Serialize(obj);
    }

Possible duplicate of [MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer](http://stackoverflow.com/questions/5692836/maxjsonlength-exception-in-asp-net-mvc-during-javascriptserializer) — Sruit A.Suk, Apr 21 '16 at 13:32

score 31 · Accepted Answer · answered Nov 14 '14 at 09:01

31

I assume it is a web service that you are getting the data from (as your question is tagged "web-service"), change maxlength in web.config :

<configuration> 
   <system.web.extensions>
       <scripting>
           <webServices>
               <jsonSerialization maxJsonLength="50000000"/>
           </webServices>
       </scripting>
   </system.web.extensions>
</configuration>

Or you can try the MaxJsonLength of JavaScriptSerializer :

JavaScriptSerializer serializer = new JavaScriptSerializer();
serializer.MaxJsonLength = Int32.MaxValue; 
myObject obj = serializer.Deserialize<yourObject>(yourJsonString);

answered Nov 14 '14 at 09:01

Zaki

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1

If you would like to hardcode the maximum int value in `maxJsonLength` it is `2147483644`. – 2Yootz Nov 29 '16 at 13:23
serializer.MaxJsonLength = Int32.MaxValue; this line did the the trick for me! Thanks @zaki – Aimal Khan May 18 '17 at 15:37
I'm getting this error when request post with 700 and more length array list to controller. – SPnL Dec 22 '17 at 09:21
1

@Zaki this is an old post i know. but in my asp.net web app i am running into this issue. I tried both method and my application tells me "Error during serialization or deserialization using the JSON JavaScriptSerializer" – mmangual83 Apr 13 '18 at 13:48

Error during serialization or deserialization using the JSON JavaScriptSerializer.

1 Answers1