How to create JSON array in ASP.net?

Question

i have created following format JSON array in PHP. But now i want to create same format JSON array in ASP.net using C# code . How can i create it?

{
 "android": [
 {
 "name": "aaa",
 "version": "123"
 },
 {
 "name": "bb",
 "version": "34"
 },
 {
 "name": "cc",
 "version": "56"
 }
 ]
}

am using following method

 Public Class OutputJson
 {
 public List<Entity> Android { get; set; }
 }
 Public Class Entity
 {
 Public string Name { get; set; }
 Public string Version { get; set; }
 }
 outputJson = new OutputJson{
 Android = new List<Entity> 
 {
 new Entity { Name = "aaa", Version = "123"},
 new Entity { Name = "bb", Version = "34"},
 new Entity { Name = "cc", Version = "56"},
} 
var output = new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(outputJson); 
string YourJsonArray = output; 
Response.Clear(); 
Response.ContentType = "application/json; charset=utf-8"; 
Response.Write(YourJsonArray );
Response.End();

am receive following error

Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.
Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".

How can i solve it?

• Garry: Duplicate for stackoverflow.com/questions/22918674/…
• Sasi Kumar: am tried but not works
• Garry: Then you should have added in your question, what you have tried and why it didnt worked and the error you are getting.
• Wolf5: Check out this topic: stackoverflow.com/questions/1056121/… (Newtonsoft.Json)
• Sasi Kumar: am android developer i dont know .net. please tell how to convert json array ?

Answer 1

The easiest way is to add a json library to your project. For instance, with NuGet:

Install-Package Newtonsoft.Json

Then, serialize your data:

struct VersionInfo
{
 public string name;
 public string value;
}
static void JsonExample()
{
 // create a dictionary as example
 var dict = new Dictionary<string, VersionInfo[]>();
 dict.Add("android", new VersionInfo[3]);
 dict["android"][0] = new VersionInfo { name = "aaa", value = "123" };
 dict["android"][1] = new VersionInfo { name = "bb", value = "34" };
 dict["android"][2] = new VersionInfo { name = "cc", value = "56" };
 var result = Newtonsoft.Json.JsonConvert.SerializeObject(dict);
}

This should produce the literal output in your example.

• Sasi Kumar: is it possible to create json array without add library? because the FTP controls not in myside.
• Martin Watts: I don't really understand what you're asking here. When you compile your program the Newtonsoft.Json library is just a dll you ship with your program. What does FTP have to do with that?
• codeandcloud: why use newtonsoft at all?
• Martin Watts: That's an existing SO question
• Martin Watts: And Newtonsoft.Json is about one third of the size of System.Web.Extensions and System.Web.Extensions isn't available in the Client Profile.

Answer 2

you can use JavaScriptSerializer Class that comes with .NET framework.

Namespace: System.Web.Script.Serialization

Assuming that your Outputjson is something like :

Public Class OutputJson
{
 public List<Entity> Android { get; set; }
}

And Entity is like :

Public Class Entity
{
 Public string Name { get; set; }
 Public string Version { get; set; }
}

So the using of JavaScriptSerializer Class will be like that :

var outputJson = new OutputJson{
 Android = new List<Entity> 
 {
 new Entity { Name = "aaa", Version = "123"},
 new Entity { Name = "bb", Version = "34"},
 new Entity { Name = "cc", Version = "56"},
 } 
var output = new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(outputJson); 

• Sasi Kumar: all code in same file or separate file? am android developer i dont know .net.
• Zakaria Smahi: You can insert each part of code in a separate Class file ( the efficient way ) ( OutputJsonOutputJson.cs for OutputJson Class and Entity.cs for Entity Class ) and then instantiate them where do you need them (the place where you want serialize them as Json.).
• Sasi Kumar: In your code how can i print jsonarray in my page(test.asp)?
• Zakaria Smahi: You can use Response.write() method to print your json : string YourJsonArray = JsonArrayValue; Response.Clear(); Response.ContentType = "application/json; charset=utf-8"; Response.Write(YourJsonArray ); Response.End(); Use this code in Page_Load Event if you want to display it directly
• Zakaria Smahi: This issue occurs when a custom error page in the application also contains an error. according to support.microsoft.com, you can resolve it by adding a static page as an Error page inside your project and add it in your web.config file as suggested Visual Studio in Compiling Errors Log

Answer 3

try this

 var s = new JavaScriptSerializer();
 string jsonClient = s.Serialize(customers);

• Sasi Kumar: am android developer i dont know .net. please tell how to convert json array with details
• manish: yes it possible you can use System.Web.Script.Serialization; namespace with out adding any library, its a .net core library