URGENT - ParseModel - JSON - MAxLength Error

[Karthick]

Hi, I am trying to bind a JSON to DiagramProperties using ParseModel and getting "Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property" error. Here is my code. 

StreamReader oReader = new StreamReader(@"D:\Diagram\Syncfusion-Diagram-JSON\BASE.txt");

string szJsonString = oReader.ReadToEnd().Trim();

 DiagramProperties model = new DiagramProperties();

 model.ParseModel(szJsonString);

I am using this code in MVC controller. Can someone help me quick? I have a deployment tonight and need to resolve this? I tried using DMSerialize class but didnt work or I am not sure if I implemented wrongly. Please help.

[Shyam G]

Hi Karthick, 

 

By default, the entire diagram model properties will be serialized. So only the JSON string length exceeds the maximum value. Please refer to the code example in which we have removed the property which is set as an null value after saving the diagram. please refer to the sample below. However currently we don’t have support to serialize the particular/user defined diagram’s model properties. We have already logged “Need to provide an option to serialize the user defined diagram model’s properties” as a feature and provided the feature description below.  We have planned to implement this feature in our volume 4,2017 release. We will let you know once the volume 4,2017 release is rolled out.  

 

Code example: 

 

      var diagram = $("#diagram").ejDiagram("instance"); 

        //save the diagram 

       var saveDiagram = diagram.save(); 

         for (var prop in saveDiagram) { 

                 //delete the null value property 

         if (saveDiagram[prop] === null) { 

                     delete saveDiagram[prop]; 

            } 

          } 

 

Also please use the below code example in the web.config file. Please refer to the below sample for further reference. 

 

Code example: 

<system.web.extensions> 

    <scripting> 

      <webServices> 

        <jsonSerialization maxJsonLength="2147483644"/> 

      </webServices> 

    </scripting> 

  </system.web.extensions> 

 

Sample:http://www.syncfusion.com/downloads/support/directtrac/general/ze/Karthickmvcsample1428606666 

 

Regards, 

Shyam G 

[Karthick]

Thank you Shyam for the direction. Also, I noticed that historical data with the changes are logged as part of the JSON that increases the size. I deleted it and the JSON size has come down to 1MB from 5MB. Then the ParseModel line worked well. 

[Shyam G]

Hi Karthick, 

Please let us know if you need further assistance on this. 

Regards, 

Shyam G 

[syntax]

Thank you Shyam for the direction. Also, I noticed that historical data with the changes are logged as part of the JSON that increases the size. I deleted it and the JSON size has come down to 1MB from 5MB. Then the ParseModel line worked well. 

Hi Kartchik,

I am running into the same problem. Can you please share what you have done in order to bring down the size of the JSON? Where do you delete the historical data?

Thank you in advance.

[Shyam G]

Hi Syntax, 

 

Could you please upgrade to the latest version 15.4.0.17? if yes, we have implemented the feature “Need to provide an option to serialize the user defined diagram model’s properties” in our Essential Studio 2017 Volume 4 Release v15.4.0.17 is rolled out and is available for download under the following link 

                            

Link: https://www.syncfusion.com/forums/134428/essential-studio-2017-volume-4-release-v15-4-0-17-is-available-for-download 

 

In this feature, if we set diagram model’s serializationSettings preventDefaultValues property as true, then the user defined model properties alone will be saved while saving it using diagram save method. Please refer to the code example and drafted documentation below. 

 

Code example: 

DiagramProperties model = new DiagramProperties(); 

// serialize user defined model properties when preventDefaultValues is true.   

 model.SerializationSettings.PreventDefaultValues = true; 

 

Drafted documentation:  http://www.syncfusion.com/downloads/support/directtrac/general/ze/SerializationMVC-430104457 

  

please let us know if any concerns. 

 

Regards, 

Shyam G