Скачать или смотреть Creating a Powerful JsonConverter for Your appsettings.json in C#

Learn how to build a custom `JsonConverter` in C# that transforms your appsettings.json strings into a structured collection of symbols.
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Creating a Powerful JsonConverter for Your appsettings.json in C#

Managing configurations in a JSON format is a common requirement in C# . However, transforming data structures, especially when they involve collections and complex relationships, can pose some unique challenges. One of the frequent tasks developers encounter is the need to convert simple arrays of strings into more structured types when dealing with configuration parameters like appsettings.json. In this post, we'll walk through creating an effective custom JsonConverter that allows you to convert a string representation of currency pairs into a structured collection of symbols for a backtesting configuration.

The Problem

Imagine you have the following structure in your appsettings.json file:

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Here, the Symbols array contains strings that represent currency pairs in the format of <BaseAsset>/<QuoteAsset>. Our goal is to convert these strings into a more usable format: IReadOnlyCollection<Symbol>. Each Symbol will represent a currency pair consisting of a BaseAsset and a QuoteAsset. Additionally, we need to ensure that each QuoteAsset matches the StakeCurrency; if not, we need to throw an exception. This requirement prevents potential mismatches in currency usage during backtesting.

Solution Overview

To solve this challenge, we can leverage a custom JsonConverter as follows:

Create a Symbol Class: This class will hold the BaseAsset and QuoteAsset properties.

Implement a Custom JsonConverter: This will handle the transformation of the string array into a collection of Symbol objects.

Deserialization Logic: This section involves reading the JSON data, parsing it into desired objects, and validating the relationships.

Step 1: Define Your Classes

To begin, we'll define two classes: BacktestOptions to represent the overall configuration and a Symbol to represent currency pairs.

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Step 2: Implement the Custom JsonConverter

Next, let's create a converter class that will implement the logic for transforming the strings into a collection of Symbol objects.

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Step 3: Handle Deserialization

With the SymbolConverter established, we can now implement the logic to deserialize the JSON data while ensuring the integrity of the configuration.

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Step 4: Using Your Converter

You can then deserialize your JSON configuration like this:

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Final Thoughts

By following these steps, you've created a custom JsonConverter that effectively transforms a list of currency pair strings from appsettings.json into a structured format that your C# application can easily work with. This converter not only enhances maintainability but also ensures data integrity by validating the relationships between your configuration parameters. Feel free to extend this code further based on specific requirements or enhancements in the future.

Incorporating such practices into your configuration management can lead to more robust and error-resistant applications. Happy coding!