Adding custom code

Create a new file and add your custom logic

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namespace YourNamespace;
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public static class Helper
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{
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    public static void MyHelper()
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    {
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        Console.WriteLine("Hello World!");
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    }
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}

Add your file to .fernignore

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# Specify files that shouldn't be modified by Fern
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src/YourNamespace/Helper.cs

Consume the helper

Now your users can consume the helper function by importing it from the SDK.

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using YourNamespace;
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Helper.MyHelper();

Update generators.yml configuration

Name your Fern-generated client something like BaseClient to reflect that this client will be extended.

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- name: fernapi/fern-csharp-sdk
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  version: 2.65.0
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  config:
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    client-class-name: BaseClient

Import and extend the generated client

First, import the Fern generated base client and extend it. Then, add whatever methods you want.

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namespace YourNamespace;
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public class MyClient : BaseClient
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{
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    public MyClient(ClientOptions? clientOptions = null) : base(clientOptions)
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    {
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    }
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    public void MyHelper()
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    {
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        Console.WriteLine("Hello World!");
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    }
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}

Update .fernignore

Add the MyClient.cs to .fernignore.

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+ src/YourNamespace/MyClient.cs

Consume the method

Instead of constructing the generated client, your users will want to construct the extended client.

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using YourNamespace;
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var client = new MyClient();

Now your users can consume the helper function by importing it from the SDK.

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client.MyHelper();