c#之从服务器下载压缩包，并解压

using ICSharpCode.SharpZipLib.Zip;
using System;
using System.IO;
using System.Net;

public class CsvFilesDownloader
{
const string RootUrl = "http://xxx-";       // csv 文件下载地址
const string CSVDirAssetPath = "Assets/CSVConvertScripts/CSVFiles";                         // csv 文件保存目录

#region Version

public enum Version
{
Trunk, CBT3, CBT2, CBT1, TT, Daye, M4, M3, M2,
}

#endregion

public static void Start(Version version)
{
string url = RootUrl + version;
var request = (HttpWebRequest)WebRequest.Create(url);
request.Method = WebRequestMethods.Http.Post;

var response = request.GetResponse();
var stream = response.GetResponseStream();
string saveDirPath = AssetBundleItem.GetFullPath(CSVDirAssetPath);

Decompress(stream, saveDirPath);
}

// 需使用开源类库：ICSharpCode.SharpZipLib，可以网上下载
static void Decompress(Stream src, string targetDirPath)
{
if (src == null)
throw new ArgumentNullException("src");
if (string.IsNullOrEmpty(targetDirPath))
throw new ArgumentException("targetDirPath");

if (!Directory.Exists(targetDirPath))
Directory.CreateDirectory(targetDirPath);

using (ZipInputStream decompressor = new ZipInputStream(src))
{
ZipEntry entry;

while ((entry = decompressor.GetNextEntry()) != null)
{
if (entry.IsDirectory)
continue;

if (Path.GetExtension(entry.Name).ToLower() != ".csv")
continue;

string fileName = Path.GetFileName(entry.Name);
string path = Path.Combine(targetDirPath, fileName);
byte[] data = new byte[2048];

using (FileStream streamWriter = File.Create(path))
{
int bytesRead;
while ((bytesRead = decompressor.Read(data, 0, data.Length)) > 0)
streamWriter.Write(data, 0, bytesRead);
}
}
}
}

}