Net Core Json Serializer

JSON (JavaScript Object Notation) is an efficient data encoding format that enables fast exchanges of small amounts of data between client browsers and AJAX-enabled Web services. This article demonstrates how to serialize.NET type objects into JSON-encoded data and then deserialize data in the JSON format back into instances of.NET types. Mar 30, 2017  JSON (JavaScript Object Notation) is an efficient data encoding format that enables fast exchanges of small amounts of data between client browsers and AJAX-enabled Web services. This article demonstrates how to serialize.NET type objects into JSON-encoded data and then deserialize data in the JSON format back into instances of.NET types. The quickest method of converting between JSON text and a.NET object is using the JsonSerializer.The JsonSerializer converts.NET objects into their JSON equivalent and back again by mapping the.NET object property names to the JSON property names and copies the values for you. The release of.NET Core 3 today includes a brand new serializer for JavaScript Object Notation (JSON) under the System.Text.Json namespace.

1. Net Core Json Serializer Free
2. .net Core Json Serializer Camelcase
3. .net Core 3 Json Serializer
4. .net Core Json Serializer Pascal Case
5. .net Core Json Serializer Enum
6. Dotnet Core Json Serializer Camelcase
7. .net Core Default Json Serializer

To serialize a.Net object to JSON string use Serialize method. It's possible to deserialize JSON string to.Net object using Deserialize or DeserializeObject methods. Let's see how to implement serialization and deserialization using JavaScriptSerializer. AutoWrapper - Prettify Your ASP.NET Core APIs With Meaningful Responses. Public Microsoft.AspNetCore.Html.IHtmlContent Serialize (object value, Newtonsoft.Json.JsonSerializerSettings serializerSettings); abstract member Serialize: obj.

ASP.NET Core already uses JSON.NET as JavaScriptSerializer isn't implemented/ported to.NET Core. Microsoft.AspNetCore.Mvc depends on Microsoft.AspNetCore.Formatter.Json which depends on Microsoft.AspNetCore.JsonPatch, which depends on Newtonsoft.Json (see source). This is only true for ASP.NET Core 1.0 to 2.2.

Net Core Json Serializer Free

commented Aug 30, 2018•

edited

commented Sep 10, 2018•

edited

commented Sep 27, 2019•

edited

Introduction

This tutorial teaches you a number of features in .NET Core and the C# language. You’ll learn:

.net Core Json Serializer Camelcase

• The basics of the .NET Core Command Line Interface (CLI).
• An overview of C# Language features.
• Managing dependencies with NuGet
• HTTP Communications
• Processing JSON information
• Managing configuration with Attributes.

You’ll build an application that issues HTTP Requests to a RESTservice on GitHub. You'll read information in JSON format, and convertthat JSON packet into C# objects. Finally, you'll see how to work withC# objects.

There are a lot of features in this tutorial. Let’s build them one by one.

If you prefer to follow along with the final sample for this topic, you can download it. For download instructions, see Samples and Tutorials.

Prerequisites

You’ll need to set up your machine to run .NET core. You can find theinstallation instructions on the .NET Core Downloadspage. You can run thisapplication on Windows, Linux, macOS or in a Docker container.You’ll need to install your favorite code editor. The descriptions belowuse Visual Studio Code, which is an opensource, cross platform editor. However, you can use whatever tools you arecomfortable with.

Create the Application

The first step is to create a new application. Open a command prompt andcreate a new directory for your application. Make that the currentdirectory. Type the command dotnet new console at the command prompt. Thiscreates the starter files for a basic 'Hello World' application. As this is anew project, none of the dependencies are in place, so the first run willdownload the .NET Core framework, install a development certificate and runthe NuGet package manager to restore missing dependencies.

Before you start making modifications, typedotnet run (see note) at the command prompt torun your application. dotnet run automatically performs dotnet restoreif your environment is missing dependencies. It also performs dotnet build if your application needs to be rebuilt.After your initial setup, you will only need to run dotnet restore or dotnet buildwhen it makes sense for your project.

.net Core 3 Json Serializer

Adding New Dependencies

One of the key design goals for .NET Core is to minimize the size ofthe .NET installation. If an applicationneeds additional libraries for some of its features, you add thosedependencies into your C# project (*.csproj) file. For our example, you'll need to add the System.Runtime.Serialization.Json packageso your application can process JSON responses.

Open your csproj project file. The first line of the file should appear as:

Add the following immediately after this line:

Most code editors will provide completion for different versions of theselibraries. You'll usually want to use the latest version of any packagethat you add. However, it is important to make sure that the versionsof all packages match, and that they also match the version of the .NETCore Application framework.

Any ideas on what I might do to be able to get it to run from Task Scheduler sinceit will run from the windows command line. The solution you provided:C: ProgramFiles ( x86 ) MicrosoftOffice Office15MSACCESS. Hello,I too am having problems getting Task Scheduler to open/run MS-Access with a macro. EXE'D:pathtoyourAccddbfilefile.accdb'does work for me if I run it from thecommand line BUT if I try and run it via Task Scheduler, the first half of the macro runs but when it gets to the point where it needs to execute my vba code it just hangs. Task scheduler microsoft office.

After you've made these changes, execute dotnet restore (see note) sothat the package is installed on your system.

Making Web Requests

Now you're ready to start retrieving data from the web. In thisapplication, you'll read information from theGitHub API. Let's read informationabout the projects under the.NET Foundation umbrella. You'llstart by making the request to the GitHub API to retrieve informationon the projects. The endpoint you'll use is: https://api.github.com/orgs/dotnet/repos. You want to retrieve all theinformation about these projects, so you'll use an HTTP GET request.Your browser also uses HTTP GET requests, so you can paste that URL intoyour browser to see what information you'll be receiving and processing.

You use the HttpClient class to make web requests. Like all modern .NETAPIs, HttpClient supports only async methods for its long-running APIs.Start by making an async method. You'll fill in the implementation as youbuild the functionality of the application. Start by opening the program.cs file in your project directory and adding the following method to the Program class:

You'll need to add a using statement at the top of your Main method sothat the C# compiler recognizes the Task type:

If you build your project at this point, you'll get a warning generatedfor this method, because it does not contain any await operators andwill run synchronously. Ignore that for now; you'll add await operatorsas you fill in the method.

Next, rename the namespace defined in the namespace statement from its default of ConsoleApp to WebAPIClient. We'll later define a repo class in this namespace.

Next, update the Main method to call this method. TheProcessRepositories method returns a Task, and you shouldn't exit theprogram before that task finishes. Therefore, you must use the Waitmethod to block and wait for the task to finish:

Now, you have a program that does nothing, but does it asynchronously. Let's improve it.

First you need an object that is capable to retrieve data from the web; you can usea HttpClient to do that. This object handles the request and the responses. Instantiate a single instance of that type in the Program class inside the Program.cs file.

Let's go back to the ProcessRepositories method and fill in a first version of it:

You'll need to also add two new using statements at the top of the file for this to compile:

This first version makes a web request to read the list of all repositories under the dotnetfoundation organization. (The gitHub ID for the .NET Foundation is 'dotnet'). The first few lines set upthe HttpClient for this request. First, it is configured to accept the GitHub JSON responses.This format is simply JSON. The next line adds a User Agent header to all requests from thisobject. These two headers are checked by the GitHub server code, and are necessary to retrieveinformation from GitHub.

After you've configured the HttpClient, you make a web request and retrieve the response. Inthis first version, you use the HttpClient.GetStringAsync(String) convenience method. This convenience methodstarts a task that makes the web request, and then when the request returns, it reads theresponse stream and extracts the content from the stream. The body of the response is returnedas a String. The string is available when the task completes.

The final two lines of this method await that task, and then print the response to the console.Build the app, and run it. The build warning is gone now, because the ProcessRepositories nowdoes contain an await operator. You'll see a long display of JSON formatted text.

Processing the JSON Result

.net Core Json Serializer Pascal Case

At this point, you've written the code to retrieve a response from a web server, and displaythe text that is contained in that response. Next, let's convert that JSON response into C#objects.

The JSON Serializer converts JSON data into C# Objects. Your first task is to define a C# classtype to contain the information you use from this response. Let's build this slowly, so start witha simple C# type that contains the name of the repository:

Put the above code in a new file called 'repo.cs'. This version of the class represents thesimplest path to process JSON data. The class name and the member name match the names usedin the JSON packet, instead of following C# conventions. You'll fix that by providing someconfiguration attributes later. This class demonstrates another important feature of JSONserialization and deserialization: Not all the fields in the JSON packet are part of this class.The JSON serializer will ignore information that is not included in the class type being used.This feature makes it easier to create types that work with only a subset of the fields inthe JSON packet.

Now that you've created the type, let's deserialize it. You'll need to create aDataContractJsonSerializer object. This object must know the CLR type expected for theJSON packet it retrieves. The packet from GitHub contains a sequence of repositories, so aList<repo> is the correct type. Add the following line to your ProcessRepositories method:

You're using two new namespaces, so you'll need to add those as well:

.net Core Json Serializer Enum

Next, you'll use the serializer to convert JSON into C# objects. Replace the call toGetStringAsync(String) in your ProcessRepositories method with the following two lines:

Notice that you're now using GetStreamAsync(String) instead of GetStringAsync(String). The serializeruses a stream instead of a string as its source. Let's explain a couple features of the C#language that are being used in the second line above. The argument to ReadObject(Stream) is anawait expression. Await expressions can appear almost anywhere in your code, even thoughup to now, you've only seen them as part of an assignment statement.

Secondly, the as operator converts from the compile time type of object to List<repo>.The declaration of ReadObject(Stream) declares that it returns an object of type System.Object. ReadObject(Stream) will return the type you specified when you constructed it (List<repo> inthis tutorial). If the conversion does not succeed, the as operator evaluates to null,instead of throwing an exception.

You're almost done with this section. Now that you've converted the JSON to C# objects, let's displaythe name of each repository. Replace the lines that read:

with the following:

Compile and run the application. It will print out the names of the repositories that are part of the.NET Foundation.

Controlling Serialization

Before you add more features, let's address the repo type and make it follow more standardC# conventions. You'll do this by annotating the repo type with attributes that control howthe JSON Serializer works. In your case, you'll use these attributes to define a mapping betweenthe JSON key names and the C# class and member names. The two attributes used are the DataContractAttributeand DataMemberAttribute attributes. By convention, all Attribute classes end in the suffixAttribute. However, you do not need to use that suffix when you apply an attribute.

The DataContractAttribute and DataMemberAttribute attributes are in a different library, so you'll need to addthat library to your C# project file as a dependency. Add the following line to the <ItemGroup> section of your project file:

After you save the file, run dotnet restore (see note) to retrieve this package.

Next, open the repo.cs file. Let's change the name to use Pascal Case, and fully spell out the nameRepository. We still want to map JSON 'repo' nodes to this type, so you'll need to add theDataContractAttribute attribute to the class declaration. You'll set the Name property of the attributeto the name of the JSON nodes that map to this type:

The DataContractAttribute is a member of the System.Runtime.Serialization namespace, so you'llneed to add the appropriate using statement at the top of the file:

You changed the name of the repo class to Repository, so you'll need to make the same name changein Program.cs (some editors may support a rename refactoring that will make this change automatically:)

Next, let's make the same change with the name field by using the DataMemberAttribute class. Makethe following changes to the declaration of the name field in repo.cs:

This change means you need to change the code that writes the name of each repository in program.cs:

Do a dotnet build followed by a dotnet run to make sure you've got the mappings correct. You shouldsee the same output as before. Before we process more properties from the web server, let's make onemore change to the Repository class. The Name member is a publicly accessible field. That's nota good object-oriented practice, so let's change it to a property. For our purposes, we don't needany specific code to run when getting or setting the property, but changing to a property makes iteasier to add those changes later without breaking any code that uses the Repository class.

Remove the field definition, and replace it with an auto-implemented property:

The compiler generates the body of the get and set accessors, as well as a private field tostore the name. It would be similar to the following code that you could type by hand:

Let's make one more change before adding new features. The ProcessRepositories method can do the asyncwork and return a collection of the repositories. Let's return the List<Repository> from that method,and move the code that writes the information into the Main method.

Change the signature of ProcessRepositories to return a task whose result is a list of Repositoryobjects:

Then, just return the repositories after processing the JSON response:

The compiler generates the Task<T> object for the return because you've marked this method as async.Then, let's modify the Main method so that it captures those results and writes each repository nameto the console. Your Main method now looks like this:

Accessing the Result property of a Task blocks until the task has completed. Normally, you would preferto await the completion of the task, as in the ProcessRepositories method, but that isn't allowed in theMain method.

Dotnet Core Json Serializer Camelcase

Reading More Information

Let's finish this by processing a few more of the properties in the JSON packet that gets sent from theGitHub API. You won't want to grab everything, but adding a few properties will demonstrate a few morefeatures of the C# language.

Let's start by adding a few more simple types to the Repository class definition. Add these propertiesto that class:

These properties have built-in conversions from the string type (which is what the JSON packets contain) tothe target type. The Uri type may be new to you. It represents a URI, or in this case, a URL. In the caseof the Uri and int types, if the JSON packet contains data that does not convert to the target type,the serialization action will throw an exception.

Once you've added these, update the Main method to display those elements:

As a final step, let's add the information for the last push operation. This information is formatted inthis fashion in the JSON response:

That format does not follow any of the standard .NET DateTime formats. Because of that, you'll need to writea custom conversion method. You also probably don't want the raw string exposed to users of the Repositoryclass. Attributes can help control that as well. First, define a private property that will hold thestring representation of the date time in your Repository class:

The DataMemberAttribute attribute informs the serializer that this should be processed, even though it is nota public member. Next, you need to write a public read-only property that converts the string to avalid DateTime object, and returns that DateTime:

Let's go over the new constructs above. The IgnoreDataMember attribute instructs the serializerthat this type should not be read to or written from any JSON object. This property contains only aget accessor. There is no set accessor. That's how you define a read-only property in C#. (Yes,you can create write-only properties in C#, but their value is limited.) The ParseExact(String, String, IFormatProvider)method parses a string and creates a DateTime object using a provided date format, and adds additionalmetadata to the DateTime using a CultureInfo object. If the parse operation fails, theproperty accessor throws an exception.

To use InvariantCulture, you will need to add the System.Globalization namespace to the using statementsin repo.cs:

.net Core Default Json Serializer

Finally, add one more output statement in the console, and you're ready to build and run this appagain:

Your version should now match the finished sample.

Conclusion

This tutorial showed you how to make web requests, parse the result, and display properties ofthose results. You've also added new packages as dependencies in your project. You've seen some ofthe features of the C# language that support object-oriented techniques.

Note

Starting with .NET Core 2.0 SDK, you don't have to run dotnet restore because it's run implicitly by all commands that require a restore to occur, such as dotnet new, dotnet build and dotnet run.It's still a valid command in certain scenarios where doing an explicit restore makes sense, such as continuous integration builds in Azure DevOps Services or in build systems that need to explicitly control the time at which the restore occurs.