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 — Sruit A.Suk
– Sruit A.Suk, Commented Apr 21, 2016 at 13:32

Zaki · Accepted Answer · 2014-11-14 09:01:21Z

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, 2014 at 9:01

Zaki

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4 Comments

m00seDrip Over a year ago

If you would like to hardcode the maximum int value in maxJsonLength it is 2147483644.

Aimal Khan Over a year ago

serializer.MaxJsonLength = Int32.MaxValue; this line did the the trick for me! Thanks @zaki

Swapnil Over a year ago

I'm getting this error when request post with 700 and more length array list to controller.

mmangual83 Over a year ago

@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"

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