deserialization json c#

Question

0.00/5 (No votes)

See more:

Please , help. I am trying to deserialize json string(

{"response":[259,{"body":"я тебе ","mid":17759,"uid":18537276,"from_id":18537276,"date":1345466897,"read_state":1,"out":1},{"body":"jdjdjdjd","mid":17736,"uid":18537276,"from_id":18537276,"date":1345400400,"read_state":1,"out":1,"attachment":{"type":"doc","doc":{"did":118620269,"owner_id":18537276,"title":"IMG_20120722_220434.jpg","size":475878,"ext":"jpg","url":"http:\/\/vk.com\/doc18537276_118620269?hash=59f1fe51a02a65519c&dl=3972a9297f3da6a20c","thumb":"http:\/\/cs4343.vkontakte.ru\/u18537276\/-3\/m_69a4a578da.jpg","access_key":"7a6cb6559b179dec16"}}

) etc.

Here is code:

C#

DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Response_GetHistory));
Response_GetHistory gh = new Response_GetHistory();
gh = (Response_GetHistory)ser.ReadObject(stream);

here is class

C#

public class Response_GetHistory
{
public int s;
public Message[] response;
}
 
public class Message
{
 
public string mid;
public string uid;
public string date;
public string read_state;
public string title;
public string body;
public Attachments attachments;
public Message fwd_messages;
public string chat_id;
public string chat_active;
public string users_count;
public string admin_id;
public string deleted;
}

but deserialization failed;
I think becase of number 259..What should I change in my classes?

Posted 21-Aug-12 5:29am

dmitrij1990

Updated 21-Aug-12 7:46am

Mehdi Gholam

v2

Add a Solution

Comments

Nueman 21-Aug-12 11:32am

Please use the Improve question link to edit your question and put the code in a code block. It will make your query more readable and more likely to get a response. Thanks.

felipekm 21-Aug-12 12:51pm

Where is your ajax call?
Please show us your json contruction.

3 solutions

Solution 1

I think you need to decorate the class with [DataContract()] attribute and properties with [DataMember(Name="<fieldname_in_json_string>")] attribute to tell the DataContractSerialiser which properties of the class to map to which field in JSON. For e.g.

C#

[DataContract()]
public class Message
{
[DataMember(Name="mid")]
public string mid {get;set}
//so on for the all the others as well.

These attributes are in System.Runtime.Serialization namespace. Hope this helps.

Posted 21-Aug-12 5:46am

I.explore.code

Comments

dmitrij1990 21-Aug-12 12:01pm

thanks, but how i can add atribute to field which has no name in json string?
[DataMember(Name="")] - generate exception

dmitrij1990 21-Aug-12 12:02pm

I am about 259 at the begining of json string

I.explore.code 21-Aug-12 13:22pm

well, the JSON should be well formed. If you control the construction of JSON then u can try naming that field. Not sure if its an index of an array of JSON objects. Even with other JSON deserialisers you would need to have that field identifiable by a string name.

Solution 3

Your json seems to be invalid check it here : http://jsonlint.com/[^]

Posted 21-Aug-12 7:46am

Mehdi Gholam

Comments

Matt T Heffron 21-Aug-12 17:06pm

Other than the missing closing delimiters (i.e., "}]}" which were implied by the original poster) this passes jsonlint.com.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

**Zoltán Zörgő** · Accepted Answer · 2012-08-21T06:37:00

Have you tried with other serializers (like fastJSON[^] or Json.NET[^])- just to see, if the result is the same? To me it looks like the 259 value is corresponding to the public int s; field, but without field name, and wrong position. Thy to change "s" to something longer, just to see...
Googleing revealed, that DataContractJsonSerialize has several bugs...

deserialization json c#

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0

Existing Members

...or Join us