AsyncEnumerableStringsResult

AsyncEnumerableStringsResult.cs

//https://stackoverflow.com/questions/76106284/how-to-return-chunked-text-plain-content-from-web-api-using-minimal-api
//https://github.com/dotnet/aspnetcore/tree/main/src/Http/Http.Results

public class AsyncEnumerableStringsResult : IResult, IContentTypeHttpResult, IStatusCodeHttpResult
{
    protected readonly IAsyncEnumerable<string> chunks;

    public string? ContentType => "text/plain; charset=utf-8";

    public int StatusCode => StatusCodes.Status200OK;

    int? IStatusCodeHttpResult.StatusCode => StatusCode;

    public AsyncEnumerableStringsResult(IAsyncEnumerable<string> chunks) => this.chunks = chunks ?? throw new ArgumentNullException(nameof(chunks));

    public async Task ExecuteAsync(HttpContext httpContext)
    {
        if (httpContext == null)
            throw new ArgumentNullException(nameof(httpContext));

        httpContext.Response.ContentType = this.ContentType;
        httpContext.Response.StatusCode = this.StatusCode;

        await foreach (var chunk in this.chunks)
            if (!string.IsNullOrEmpty(chunk))
                await httpContext.Response.WriteAsync(chunk, cancellationToken: httpContext.RequestAborted);
    }
}