CODEWITHSUNDEEP
c#visual-studiojsonserializer
Prisoner ZERO
Prisoner ZERO

Reputation: 14176

Cannot find JavaScriptSerializer in .Net 4.0

I cannot seem to find the JavaScriptSerializer object nor the the System.Web.Script.Serialization namespace within Visual Studio 2010. I need to serialize something to JSON what am I supposed to use?

And yes, I already included the System.Web.Extensions (in System.Web.Extensions.dll) within the project. Which is why I am shocked?

Upvotes: 310

Views: 357873

Answers (12)

Tom Stickel
Tom Stickel

Reputation: 20421

I'm using Visual Studio 2015 and finally ran across this post.

Yes in order to use 

JavaScriptSerializer json = new JavaScriptSerializer();

You must right click on references and under Assemblies --> Framework choose

System.Web.Extensions

Then add in your reference

using System.Web.Script.Serialization;

Upvotes: 32

Alexander Zaldostanov
Alexander Zaldostanov

Reputation: 3011

You can use another option which is the Newtonsoft.Json, you can install it from NuGet Package Manager.

Tools >> Nuget Package Manager >> Package Manager Console by issuing command

Install-Package Newtonsoft.Json

or

by using the GUI at Tools >> Nuget Package Manager >> Manage NuGet Packages for Solution...

enter image description here

Upvotes: 5

Steffen
Steffen

Reputation: 13958

Check if you included the .net 4 version of System.Web.Extensions - there's a 3.5 version as well, but I don't think that one works.

These steps work for me:

  1. Create a new console application
  2. Change the target to .net 4 instead of Client Profile
  3. Add a reference to System.Web.Extensions (4.0)
  4. Have access to JavaScriptSerializer in Program.cs now :-)

Upvotes: 545

Ema.H
Ema.H

Reputation: 2878

using System.Web.Script.Serialization;

is in assembly : System.Web.Extensions (System.Web.Extensions.dll)

Upvotes: 13

Milan
Milan

Reputation: 3335

Just so you know, I am using Visual Studio 2013 and have had the same problem until I used the Project Properties to switch to 3.5 framework and back to 4.5. This for some reason registered the .dll properly and I could use the System.Web.Extensions.

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Upvotes: 3

Paul
Paul

Reputation: 4530

From the first search result on google:

http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx

JavaScriptSerializer Class

Provides serialization and deserialization functionality for AJAX-enabled applications.

Inheritance Hierarchy

System.Object

System.Web.Script.Serialization.JavaScriptSerializer

Namespace: System.Web.Script.Serialization

Assembly: System.Web.Extensions (in System.Web.Extensions.dll)

So, include System.Web.Extensions.dll as a reference.

Upvotes: 43

jltrem
jltrem

Reputation: 12544

For those who seem to be following the answers above but still have the problem (e.g., see the first comment on the poster's question):

You are probably working in a solution with many projects. The project you appear to be working in references other projects, but you are actually modifying a file from one of the other projects. For example:

  • project A references System.Web.Extensions
  • project A references project B

But if the file you are modifying to use System.Web.Script.Serialization is in project B, then you will need to add a reference to System.Web.Extension in project B as well.

Upvotes: 9

Scott Johnson
Scott Johnson

Reputation: 1510

  1. Right click References and do Add Reference, then from Assemblies->Framework select System.Web.Extensions.
  2. Now you should be able to add the following to your class file:
    using System.Web.Script.Serialization;

Upvotes: 141

riahc3
riahc3

Reputation: 878

You have to add the reference to the project.

In Assemblies, there is a System.Web.Extensions Add that.

Once that is done put:

    using System.Web;
    using System.Web.Script;
    using System.Web.Script.Serialization;

That worked for me.

Upvotes: 5

Alex Hopkins
Alex Hopkins

Reputation: 890

This is how to get JavaScriptSerializer available in your application, targetting .NET 4.0 (full)

using System.Web.Script.Serialization;

This should allow you to create a new JavaScriptSerializer object!

Upvotes: 14

David Ly
David Ly

Reputation: 31606

Did you include a reference to System.Web.Extensions? If you click on your first link it says which assembly it's in.

Upvotes: 8

Christopher Currens
Christopher Currens

Reputation: 30725

Are you targeting the .NET 4 framework or the .NET 4 Client Profile?

If you're targeting the latter, you won't find that class. You also may be missing a reference, likely to an extensions dll.

Upvotes: 9

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