c# - 如何使用 ASP.NET Core 进行流式处理

Question

如何在 ASP.NET Core 中正确地流式传输响应？有一个这样的 Controller (更新代码):

[HttpGet("test")]
public async Task GetTest()
{
    HttpContext.Response.ContentType = "text/plain";
    using (var writer = new StreamWriter(HttpContext.Response.Body))
        await writer.WriteLineAsync("Hello World");            
}

Firefox/Edge浏览器显示

Hello World

，同时 Chrome/Postman 报错:

The localhost page isn’t working

localhost unexpectedly closed the connection.

ERR_INCOMPLETE_CHUNKED_ENCODING

附言我即将流式传输大量内容，因此无法提前指定 Content-Length header 。

Answer 1

要流式传输应该在浏览器中显示为下载文件的响应，您应该使用 FileStreamResult:

[HttpGet]
public FileStreamResult GetTest()
{
  var stream = new MemoryStream(Encoding.ASCII.GetBytes("Hello World"));
  return new FileStreamResult(stream, new MediaTypeHeaderValue("text/plain"))
  {
    FileDownloadName = "test.txt"
  };
}