Cannot find JavaScriptSerializer in Net 4 0

Question

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    I do know System Web Extensions was marked as obsolete in 3 5

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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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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

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Right click References and do Add Reference  then from Assemblies- gt Framework select System Web Extensions  Now you should be able to add the following to your class file        using System Web Script Serialization

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

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using System Web Script Serialization     is in assembly    System Web Extensions  System Web Extensions dll

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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

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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

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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

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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    Create a new console application Change the target to  net 4 instead of Client Profile Add a reference to System Web Extensions  4 0  Have access to JavaScriptSerializer in Program cs now  -

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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

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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

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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

[c#] Cannot find JavaScriptSerializer in .Net 4.0

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