[BUG][csharp-netcore] Failed to deserialize FileParameter when using HttpClient.

[TORISOUP]

Description

When a client that returns byte[] (FileParameter) as a response is created and called, FileParameter is interpreted as Json and decoded, resulting in an exception.

openapi-generator version

5.2.1.

Related issues/PRs

I'm sorry if this has already been pointed out.

Suggest a fix/enhancement

In the next conditional branch, it looks like the fact that FileParameter is passed is not taken into account.

https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/httpclient/ApiClient.mustache#L99-L147

For now, by adding the following code, I was able to get the byte[] without any error.

if (type == typeof(FileParameter))
{
    return new FileParameter(await response.Content.ReadAsStreamAsync());
}

[NoTuxNoBux]

Hi

Any reason this has been closed? We ran into the same issue today. FileParameter is used correctly as class for responses that contain binary files, but when the API call is performed, the code still tries to deserialize it as JSON.

[TORISOUP]

The reason I closed the issue was not because it was resolved, but because I thought I made a mistake in the issue submission flow.

I have added the above process to deal with it, but it does not solve the root problem.
It may be a good idea to submit the issue again.

[TORISOUP]

I've reopened it for now.
However, I'm not sure if I've registered the issue in the correct flow. (Is the issue being managed outside of GitHub?)