C# 直接下载文件到内存
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Download file directly to memory
提问by daved
I would like to load an excel file directly from an ftp site into a memory stream. Then I want to open the file in the FarPoint Spread control using the OpenExcel(Stream) method. My issue is I'm not sure if it's possible to download a file directly into memory. Anyone know if this is possible?
我想直接从 ftp 站点将 excel 文件加载到内存流中。然后我想使用 OpenExcel(Stream) 方法在 FarPoint Spread 控件中打开文件。我的问题是我不确定是否可以将文件直接下载到内存中。有谁知道这是否可能？
采纳答案by Attila
Yes, you can download a file from FTP to memory.
是的，您可以将文件从 FTP 下载到内存。
I think you can even pass the Stream from the FTP server to be processed by FarPoint.
我认为您甚至可以将来自 FTP 服务器的 Stream 传递给 FarPoint 进行处理。
WebRequest request = FtpWebRequest.Create("ftp://asd.com/file");
using (WebResponse response = request.GetResponse())
{
Stream responseStream = response.GetResponseStream();
OpenExcel(responseStream);
}
Using WebClient you can do nearly the same. Generally using WebClient is easier but gives you less configuration options and control (eg.: No timeout setting).
使用 WebClient 您可以做几乎相同的事情。通常使用 WebClient 更容易，但为您提供较少的配置选项和控制（例如：无超时设置）。
WebClient wc = new WebClient();
using (MemoryStream stream = new MemoryStream(wc.DownloadData("ftp://asd.com/file")))
{
OpenExcel(stream);
}
回答by vivat pisces
Take a look at WebClient.DownloadData. You should be able to download the file directory to memory and not write it to a file first.
看看WebClient.DownloadData。您应该能够将文件目录下载到内存中，而不是先将其写入文件。
This is untested, but something like:
这是未经测试的，但类似于：
var spreadSheetStream
= new MemoryStream(new WebClient().DownloadData(yourFilePath));
I'm not familiar with FarPoint though, to say whether or not the stream can be used directly with the OpenExcelmethod. Online examplesshow the method being used with a FileStream, but I'd assume any kind of Streamwould be accepted.
不过，我对 FarPoint 并不熟悉，要说流是否可以直接与该OpenExcel方法一起使用。在线示例显示了与 a 一起使用的方法FileStream，但我假设任何类型的Stream都将被接受。
回答by Er?in Dedeo?lu
Download file from URL to memory. My answer does not exactly show, how to download a file for use in Excel, but shows how to create a generic-purpose in-memory byte array.
从 URL 下载文件到内存。 我的回答并没有完全说明如何下载文件以在 Excel 中使用，而是说明了如何创建通用的内存中字节数组。
private static byte[] DownloadFile(string url)
{
byte[] result = null;
using (WebClient webClient = new WebClient())
{
result = webClient.DownloadData(url);
}
return result;
}
