如何提供从 MVC 控制器下载的文件? [英] How can I present a file for download from an MVC controller?

问题描述

在 WebForms 中，我通常会有这样的代码，让浏览器显示下载文件"弹出窗口，其中包含任意文件类型，如 PDF 和文件名:

In WebForms, I would normally have code like this to let the browser present a "Download File" popup with an arbitrary file type, like a PDF, and a filename:

Response.Clear()
Response.ClearHeaders()
''# Send the file to the output stream
Response.Buffer = True

Response.AddHeader("Content-Length", pdfData.Length.ToString())
Response.AddHeader("Content-Disposition", "attachment; filename= " & Server.HtmlEncode(filename))

''# Set the output stream to the correct content type (PDF).
Response.ContentType = "application/pdf"

''# Output the file
Response.BinaryWrite(pdfData)

''# Flushing the Response to display the serialized data
''# to the client browser.
Response.Flush()
Response.End()

如何在 ASP.NET MVC 中完成相同的任务?

How do I accomplish the same task in ASP.NET MVC?

推荐答案

返回一个 FileResult 或 FileStreamResult 来自您的操作，具体取决于文件是否存在或您即时创建.

Return a FileResult or FileStreamResult from your action, depending on whether the file exists or you create it on the fly.

public ActionResult GetPdf(string filename)
{
    return File(filename, "application/pdf", Server.UrlEncode(filename));
}

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