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How to Generate C# Types From Graphql Schema?

3 minutes read

To generate C# types from a GraphQL schema, you can use tools like graphql-code-generator or graphql-dotnet. These tools allow you to specify the GraphQL schema file and generate corresponding C# classes based on the schema's types, queries, and mutations.


You can customize the generated classes to match your specific project requirements, and easily integrate them into your C# project to work with GraphQL data. This approach helps to ensure that your C# code is in sync with the GraphQL schema, reducing the likelihood of errors and inconsistencies in your application.


What is the best tool to generate C# types from a GraphQL schema?

One popular tool for generating C# types from a GraphQL schema is GraphQL Code Generator. It is a flexible code generation tool that allows you to specify various options and settings for generating C# types from a GraphQL schema. It also supports customization through templates and plugins, making it a versatile tool for generating C# types from GraphQL schemas.


What is the quickest method to generate C# types from GraphQL schema definitions?

One of the quickest methods to generate C# types from GraphQL schema definitions is to use tools like GraphQL Code Generator. This tool allows you to specify the GraphQL schema file and generate types in languages like C# based on the schema.


To use GraphQL Code Generator, you can install the tool via npm:

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npm install -g @graphql-codegen/cli


Then, you can run the following command to generate C# types from your GraphQL schema file:

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graphql-codegen --config codegen.yml


In the 'codegen.yml' file, you can specify the output format as C# and provide the path to your GraphQL schema file. The tool will generate C# types based on the schema definition and save them to the specified output directory.


By using GraphQL Code Generator, you can quickly and easily generate C# types from GraphQL schema definitions without having to manually write and maintain the types yourself.


What is the recommended approach for mapping GraphQL types to C# classes?

The recommended approach for mapping GraphQL types to C# classes is to create a class for each GraphQL type, where each property in the C# class corresponds to a field in the corresponding GraphQL type. This allows for a clear and structured representation of the GraphQL schema in the C# code.


Additionally, it is important to handle nullable types in GraphQL by using nullable reference types in C# (available in C# 8.0 and above) or using the Nullable<T> struct for nullable value types.


It is also recommended to use libraries such as GraphQL for .NET or HotChocolate, which provide tools and utilities for generating C# classes from a GraphQL schema and handling GraphQL queries and mutations in a C# application. These libraries can help streamline the process of mapping GraphQL types to C# classes and make working with GraphQL in a C# application more efficient and manageable.


How to quickly generate C# classes from a GraphQL schema using a command-line tool?

One way to quickly generate C# classes from a GraphQL schema is to use a command-line tool called graphql-codegen. Here's how you can do it:

  1. Install Node.js and npm if you haven't already done so.
  2. Install graphql-codegen globally by running the following command in your command prompt or terminal: npm install -g graphql-code-generator
  3. Create a GraphQL schema file (e.g., schema.graphql) that contains your GraphQL schema definition.
  4. Run the following command in the directory where your schema file is located to generate C# classes: graphql-codegen init
  5. Follow the prompts and select the appropriate options for your project, including choosing C# as the target language.
  6. Once the configuration is set up, run the following command to generate the C# classes from your schema: graphql-codegen generate


The generated C# classes will be saved in the specified output directory, which you can then use in your C# project to interact with your GraphQL API.


Note that you may need to configure additional options in the generated code to fit your specific project requirements.

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