deserialize json sting to genric list ( Error converting value to type... to type 'System.Collections.Generic.List`1 . Path '

Question

1.00/5 (2 votes)

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Hello friends,

here am facing little bit problem while deserializing json string to list

json string : Result of restful service

C#

"\"[{\\\"UName\\\":\\\"prasad\\\",\\\"LastName\\\":\\\"k\\\",\\\"FirstName\\\":\\\"sai\\\"}]\""

and i want to convert this json string to list of "_TempUser" class

my list :

C#

public class _TempUser
      {

          public string UName
          {
              get;
              set;

          }


          public string LastName
          {
              get;
              set;
          }

          public string FirstName
          {
              get;
              set;
          }
      }

Error is

Error converting value "[{"UName":"prasad","LastName":"k","FirstName":"sai"}]" to type 'System.Collections.Generic.List`1[loginServices.Login_Service+_TempUser]'. Path '', line 1, position 70.

code in my restful service

C#

List<_TempUser> List = new List<_TempUser>();

_TempUser ud = new _TempUser();

           ud.UName = "prasad";
           ud.FirstName = "sai";
           ud.LastName = "k";
           List.Add(ud);

           string json = JsonConvert.SerializeObject(List);

           return json;

code : for calling restful service

C#

 var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://IpAddress:Post/Login/RestServiceName.svc/RestMethoName");
            httpWebRequest.ContentType = "text/json";
            httpWebRequest.Method = "POST";
            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string json =JsonConvert.SerializeObject(Req);
                streamWriter.Write(json);
                streamWriter.Flush();
                streamWriter.Close();

                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                    string result =  streamReader.ReadToEnd();
                  
// here am converting json string to "_TempUser" List 

                    List<_TempUser> List = new List<_TempUser>();  

                    List = JsonConvert.DeserializeObject<List<_TempUser>>result   
                }

            }

any modifications or suggestions plz?

Posted 24-Nov-13 18:14pm

Lokesh Kondapalli

Updated 22-Jan-18 6:16am

Nelek

v10

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Comments

Sergey Alexandrovich Kryukov 25-Nov-13 2:19am

Where do you see a list? This is a Javascript associative container (all Javascript arrays are like that). One such object.
—SA

Lokesh Kondapalli 25-Nov-13 2:25am

Hello , really sorry i dint get you here my simple question

am receiving json string like this "\"{\\\"UName\\\":\\\"prasad\\\",\\\"LastName\\\":\\\"k\\\",\\\"FirstName\\\":\\\"sai\\\"}\""

and i want to convert this string to my list : "list<_TempUser>"

is it possible ?

Sergey Alexandrovich Kryukov 25-Nov-13 2:39am

Wrong question. There is no a list. If you need a list, make it. Deserialize it to _TempUser, make a list (why? why?!) with this only element.
—SA

Lokesh Kondapalli 25-Nov-13 2:30am

am returning from my restful service like this

List<_TempUser> List = new List<_TempUser>();
List.Add(ud);

string json = JsonConvert.SerializeObject(List);

return json;

with the help of newtonsoft json dll at server and client side for serialization and deserialization

4 solutions

Solution 4

Validate the type of data that you are sending in the header I am referring to MediaTypeWithQualityHeaderValue ("text / plain") <- since it can be an "application / Json" or "text / json", this type can change the serialization.

In my case I changed it to text / plain and it worked

I hope to be helpful

Posted 22-Jan-18 6:16am

Member 13637300

Comments

an0ther1 22-Jan-18 15:30pm

This question was raised 4 years ago & has an accepted answer.
Answering old questions will lead to down votes.

Kind Regards

Solution 3

U can just use the escape() function in the javascript.This is link where u can find the solution for escaping the special characters in the json format

http://stackoverflow.com/questions/21565404/jsonconvert-deserializeobject-special-characters-unterminated-string-expected-d[^]

Posted 21-May-15 21:22pm

Swetha M.S

Solution 1

Please see my comment to the question. You have just one instance of _TempUser. It has nothing to do with List, not in any way. This is the example of serialization: http://stackoverflow.com/questions/18711721/jsonconvert-deserializeobjecttjsonstring-returning-all-propertiest-as-null[^].

—SA

Posted 24-Nov-13 20:23pm

Sergey Alexandrovich Kryukov

Comments

Lokesh Kondapalli 25-Nov-13 2:35am

really sorry for that ,am trying with class and list... am updated my question so can see any possibilities for this list

"\"[{\\\"UName\\\":\\\"prasad\\\",\\\"LastName\\\":\\\"k\\\",\\\"FirstName\\\":\\\"sai\\\"}]\""

Sergey Alexandrovich Kryukov 25-Nov-13 2:38am

"Do or do not. There is no try". Why are you repeating this string? I already saw it. My answer should explain you everything. What else is unclear?
—SA

Lokesh Kondapalli 25-Nov-13 2:44am

by seeing ur answer i only understand that... "JSON do not match the property names" but its entirely different here am having Exact name in service as well as in client side so how can i fix this by only seeing ur link ? is it correct link for my question ?

Sergey Alexandrovich Kryukov 25-Nov-13 2:50am

What are you talking about?! Maybe you saw someone else's answer? :-)
I cannot understand what are you missing, probably something very basic...
A link? The sample corresponds almost one-to-one to what you should have. What could be unclear?
—SA

Lokesh Kondapalli 25-Nov-13 2:59am

http://stackoverflow.com/questions/18711721/jsonconvert-deserializeobjecttjsonstring-returning-all-propertiest-as-null

i think its the exact link what you posted for my question.
in url link i seen the answer that "JSON do not match the property names in your class"
but its not in my case .

yes am missing some thing basic and Error occurring, due to those special characters.

and with out those characters its working fine
that string is [{"UName":"prasad","LastName":"last","FirstName":"firest"}] i checked in
http://www.jsoneditoronline.org/

Sergey Alexandrovich Kryukov 25-Nov-13 3:17am

Are you serious?! Of course this is not your problem! Only the sample code is the same as yours. Do you want anyone to fix your code for you. Fine: throw out List<_TempUser> and replace is with <_TempUser> everywhere in your code. That's it.
—SA

Lokesh Kondapalli 25-Nov-13 3:29am

no sir am not serious... just i want task to be done thats it and very thank ful for your responce :)

<_Temp> u mean _Temp class instead of list

Sergey Alexandrovich Kryukov 25-Nov-13 3:55am

Yes, I mean that. Your name of the class is _TempUser.
You cannot solve any problems if you resist instead of collaborating. At least it looks like that... Is anything still unclear?
—SA

Lokesh Kondapalli 25-Nov-13 4:11am

yes sir, its clear but even try with class error occurring like this

"\"{\\\"UName\\\":\\\"prasad\\\",\\\"LastName\\\":\\\"k\\\",\\\"FirstName\\\":\\\"sai\\\"}\""

i did temporary solution for this : by removing the special characters. so its working fine for both list and class

string s = result.Replace(@"\", string.Empty);
string final= s.Trim().Substring(1,(s.Length)-2);

its a temporary solution,but i need permanent solution for dynamic format's

and thank you sir for spending your valuable time :)

Member 10679807 17-Sep-15 2:13am

Sergey, why is your tone so bad, the guy obviosly just wanted some help.

Sergey Alexandrovich Kryukov 17-Sep-15 16:36pm

That's why I've been trying to help. The tone is not really bad, this is just what you think. If, in response to attempt to help, someone behave the way not collaborative enough or just not patient enough, the best help would be trying to correct such behavior. I don't see anything wrong with it.

Thank you for understanding.

—SA

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Lokesh Kondapalli · Accepted Answer · 2013-11-24T22:18:00

its an temporary solution, if any once got exact solution plz let me know.

C#

 using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                    string result =  streamReader.ReadToEnd();
                  
// here am converting json string to "_TempUser" List 

 // before that am removing special characters 
  //  string is "\"[{\\\"UName\\\":\\\"prasad\\\",\\\"LastName\\\":\\\"k\\\",\\\"FirstName\\\":\\\"sai\\\"}]\""

  string s = result.Replace(@"\", string.Empty);

// after this   string is 
//  "[{"UName":"sravi","LastName":"last","FirstName":"firest"}]"

                  string final= s.Trim().Substring(1,(s.Length)-2);

// after this   string is 
//  [{"UName":"sravi","LastName":"last","FirstName":"firest"}]

                    List<_TempUser> List = new List<_TempUser>();  
 
                    List = JsonConvert.DeserializeObject<list><_tempuser>>(final)
               }
</_tempuser></list>

its working fine for me ;)

if u wana check ur json string valid or not just use this link

http://jsonlint.com/[^]

deserialize json sting to genric list ( Error converting value to type... to type 'System.Collections.Generic.List`1 . Path '

4 solutions

Solution 4

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Solution 1

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