Question: How to use a published Prompt ID (pmpt_...) with the openai-dotnet ResponsesClient?

API
1

I published a prompt in the OpenAI dashboard and got a Prompt ID with version. I’m trying to call this prompt from my C# WinForms app using the openai-dotnet SDK (Responses API), but i’m getting this exception:

System.InvalidOperationException: The requested operation requires an element of type 'String', but the target element has type 'Array'.

In the OpenAI dashboard logs, the request works and a response is created successfully (I can see same prompt id, version, output).


private async Task<string> GetChatCompletionAsync(string userInput)
{
    List<ResponseItem> inputItems =
    [
        ResponseItem.CreateUserMessageItem(userInput),
    ];

    var options = new CreateResponseOptions(inputItems);

    options.Patch.Set("$.prompt.id"u8, promptId);
    options.Patch.Set("$.prompt.version"u8, promptVersion);

    ResponseResult response = await responsesClient.CreateResponseAsync(options); // <-- exception happens here

    string text = response.GetOutputText(); 
    return text;
}

}

I couldn’t find any C# example for using a published Prompt ID

Thanks!

2

is there a solution for this problem?