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在ASP中创建文本文件并下载,无需在服务器上保存。net核心MVC 2.1

asp.net-core-2.1 asp.net-core-2.0 asp.net-core-mvc c#

niico · 技术社区 · 7 年前

公认的答案使用:

using (StreamWriter writer = new StreamWriter(Response.OutputStream, Encoding.UTF8)) {
  writer.Write("This is the content");
}

我需要在ASP中执行此操作。net Core 2.1 MVC-尽管在这方面不知道有什么反应。OutputStream是——我在谷歌上找不到任何帮助,也找不到其他方法。

我该怎么做?谢谢

3 回复 | 直到 7 年前

Chris Pratt 7 年前

ContentResult :

return Content("This is some text.", "text/plain");

这对其他“文本”内容类型也适用,如CSV:

return Content("foo,bar,baz", "text/csv");

FileResult byte[] :

return File(Encoding.UTF8.GetBytes(text), "text/plain", "foo.txt");

这个 filename Content-Disposition: attachment; filename="foo.txt" 标题。或者,您也可以返回 Content 只需手动设置此标题:

Response.Headers.Add("Content-Disposition", "attachment; filename=\"foo.txt\"");
return Content(text, "text/plain");

最后,如果要在流中构建文本,只需返回 FileStreamResult

return File(stream, "text/plain", "foo.txt");

Ortund 5 年前

在下面的代码中,您使用Response。输出流。但是,这在asp中非常有效。净,但反应。OutputStream在asp中引发错误。净核心。

using (StreamWriter writer = new StreamWriter(Response.OutputStream, Encoding.UTF8)) {
    writer.Write("This is the content");
}

所以,请使用以下代码在asp中下载文件。净核心。

using (MemoryStream stream = new MemoryStream())
{
StreamWriter objstreamwriter = new StreamWriter(stream);
objstreamwriter.Write("This is the content");
objstreamwriter.Flush();
objstreamwriter.Close(); 
return File(stream.ToArray(), "text/plain", "file.txt");
}

kasptom 7 年前

A little different way

编辑:修复了文件末尾的尾随零

[HttpGet]
[Route("testfile")]
public ActionResult TestFile()
{
    MemoryStream memoryStream = new MemoryStream();
    TextWriter tw = new StreamWriter(memoryStream);

    tw.WriteLine("Hello World");
    tw.Flush();

    var length = memoryStream.Length;
    tw.Close();
    var toWrite = new byte[length];
    Array.Copy(memoryStream.GetBuffer(), 0, toWrite, 0, length);

    return File(toWrite, "text/plain", "file.txt");
}

旧答案(尾随零问题)

[HttpGet]
[Route("testfile")]
public ActionResult GetTestFile() {
    MemoryStream memoryStream = new MemoryStream();
    TextWriter tw = new StreamWriter(memoryStream);

    tw.WriteLine("Hello World");
    tw.Flush();
    tw.Close();

    return File(memoryStream.GetBuffer(), "text/plain", "file.txt");
}

zuluk 6 年前

public ActionResult Create(Information information)
{
   var byteArray = Encoding.ASCII.GetBytes(information.FirstName + "" + information.Surname + "" + information.DOB + "" + information.Email + " " + information.Tel);
   var stream = new MemoryStream(byteArray);

   return File(stream, "text/plain", "your_file_name.txt");
}