問題描述

我有文件(來自第 3 方)正在通過 FTP 傳輸到我們服務器上的某個目錄.我下載它們并處理它們甚至'x'分鐘.效果很好.

I have files (from 3rd parties) that are being FTP'd to a directory on our server. I download them and process them even 'x' minutes. Works great.

現在，一些文件是 .zip 文件.這意味著我無法處理它們.我需要先解壓縮它們.

Now, some of the files are .zip files. Which means I can't process them. I need to unzip them first.

FTP 沒有壓縮/解壓縮的概念 - 所以我需要抓取 zip 文件，解壓縮，然后處理它.

FTP has no concept of zip/unzipping - so I'll need to grab the zip file, unzip it, then process it.

查看 MSDN zip api，我似乎無法解壓縮到內存流?

Looking at the MSDN zip api, there seems to be no way i can unzip to a memory stream?

所以這是唯一的方法......

So is the only way to do this...

1. 解壓到一個文件(什么目錄?需要一些非常臨時的位置...)
2. 讀取文件內容
3. 刪除文件.

注意:文件的內容很小 - 比如 4k <-> 1000k.

NOTE: The contents of the file are small - say 4k <-> 1000k.

推薦答案

Zip壓縮支持內置:

using System.IO;
using System.IO.Compression;
// ^^^ requires a reference to System.IO.Compression.dll
static class Program
{
    const string path = ...
    static void Main()
    {
        using(var file = File.OpenRead(path))
        using(var zip = new ZipArchive(file, ZipArchiveMode.Read))
        {
            foreach(var entry in zip.Entries)
            {
                using(var stream = entry.Open())
                {
                    // do whatever we want with stream
                    // ...
                }
            }
        }
    }
}

通常您應該避免將其復制到另一個流中 - 只需按原樣"使用它，但是，如果您在 MemoryStream 中絕對需要它，您可以這樣做:

Normally you should avoid copying it into another stream - just use it "as is", however, if you absolutely need it in a MemoryStream, you could do:

using(var ms = new MemoryStream())
{
    stream.CopyTo(ms);
    ms.Position = 0; // rewind
    // do something with ms
}

這篇關于如何將文件解壓縮到 .NET 內存流?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！