public async Task ExecuteResultAsync(HttpContext context)
{
foreach (var item in this)
{
if (item.Stream != null)
{
var content = new StreamContent(item.Stream);
if (item.ContentType != null)
{
content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(item.ContentType);
}
if (item.FileName != null)
{
var contentDisposition = new ContentDispositionHeaderValue("attachment");
contentDisposition.FileName = item.FileName;
content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");
content.Headers.ContentDisposition.FileName = contentDisposition.FileName;
content.Headers.ContentDisposition.FileNameStar = contentDisposition.FileNameStar;
}
this.content.Add(content);
}
}
// Don't set ContentLength, Transfer-Encoding: Chunked is set
// automatically by kestrel and simulates an unknown number of body elements
//context.Response.ContentLength = content.Headers.ContentLength;
context.Response.ContentType = content.Headers.ContentType.ToString();
var str = await content.ReadAsStringAsync();
var sw = new StreamWriter(context.Response.Body);
var multipartBoundary = this.content.Headers.ContentType.Parameters
.First(p => p.Name == "boundary").Value.Trim('"');
var parts = str.Split(multipartBoundary + "\r\n");
for (var i = 0; i < parts.Length; i++)
{
var part = parts[i];
await sw.WriteAsync(part);
if (i < parts.Length - 1)
{
await sw.WriteAsync(multipartBoundary + "\r\n");
}
await sw.FlushAsync();
if (i < parts.Length - 1)
{
// Artificial delay to simulate asynchronous processing and response
await Task.Delay(TimeSpan.FromSeconds(2));
}
}
await sw.DisposeAsync();
}
static void Main(string[] args)
{
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseUrls("http://*****:*****@"{ ""Name"": ""Arthur"" }");
await sw.DisposeAsync();
part1.Seek(0, SeekOrigin.Begin);
var part2 = new MemoryStream();
sw = new StreamWriter(part2, leaveOpen: true);
await sw.WriteAsync(@"{ ""Name"": ""Candace"" }");
await sw.DisposeAsync();
part2.Seek(0, SeekOrigin.Begin);
var part3 = new MemoryStream();
sw = new StreamWriter(part3, leaveOpen: true);
await sw.WriteAsync(@"{ ""Name"": ""Timothy"" }");
await sw.DisposeAsync();
part3.Seek(0, SeekOrigin.Begin);
var result = new MultipartResult();
result.Add(new MultipartContent
{
ContentType = "application/xml",
FileName = "part1.xml",
Stream = part1
});
result.Add(new MultipartContent
{
ContentType = "application/xml",
FileName = "part2.xml",
Stream = part2
});
result.Add(new MultipartContent
{
ContentType = "application/xml",
FileName = "part3.xml",
Stream = part3
});
await result.ExecuteResultAsync(context);
});
});
});
})
.Build().Run();
}