Cannot replace default json contract resolver in asp net core 3

Introduction

ASP.NET is a popular programming language used for building web applications. It provides a framework for developing dynamic websites, web services, and web applications. One of the key features of ASP.NET is its ability to handle data and deserialization using JSON. However, there may be situations you need to replace the default JSON contract resolver in ASP.NET Core 3. In this article, we will explore how to solve this problem with .

Understanding JSON Contract Resolver

Before we dive into the solution, let's first understand what a JSON contract resolver is. In ASP.NET, a contract resolver is responsible for resolving the contracts .NET types and JSON representations. It determines how the properties of a .NET object are serialized and deserialized into JSON and vice versa.

The Problem

In ASP.NET Core 3, the default JSON contract resolver is the DefaultContractResolver class. However, there may be cases where you want to replace this default resolver with a custom one. For example, you may want to customize the serialization and deserialization behavior for certain types or properties.

Solution

To replace the default JSON contract resolver in ASP.NET Core 3, you can a custom contract resolver by inheriting from the DefaultContractResolver class and overriding its . Let's see an example:


public class CustomContractResolver : DefaultContractResolver
{
    protected override JsonContract CreateContract(Type objectType)
    {
        // Custom logic to create contract for the specified type
        // Return the contract
    }
}

In the above example, we have created a custom contract resolver named CustomContractResolver by inheriting from the DefaultContractResolver class. We have overridden the CreateContract method, which is responsible for creating the contract for the specified type.

Inside the CreateContract method, you can implement your custom logic to create the contract based on your . You can customize the serialization and deserialization behavior, handle specific types or properties , and so on.

Using the Custom Contract Resolver

Once you have created the custom contract resolver, you can use it in your ASP.NET Core 3 application. To do this, you need to configure the JSON serializer settings to use your custom resolver. Here's an example:


services.AddControllers()
    .AddJsonOptions(options =>
    {
        options.JsonSerializerOptions.ContractResolver = new CustomContractResolver();
    });

In the above example, we are the JSON serializer settings in the AddJsonOptions method of the AddControllers method. We are the ContractResolver property of the JsonSerializerOptions to an instance of our custom contract resolver.

By doing this, the JSON serializer will use our custom contract resolver instead of the default one when serializing and deserializing JSON data.

Conclusion

In this article, we have explored how to solve the problem of replacing the default JSON contract resolver in ASP.NET Core 3. We have seen how to create a custom contract resolver by inheriting from the DefaultContractResolver class and overriding its methods. We have also learned how to use the custom contract resolver in an ASP.NET Core 3 application by configuring the JSON serializer settings. By following these steps, you can customize the serialization and deserialization behavior of JSON data in your ASP.NET Core 3 application.

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