利用System.IO.Compression操作压缩文件

using System.IO.Compression;

using (FileStream zipToOpen = new FileStream(@"D:\json.zip", FileMode.Open))
{
using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Update))
{

ZipArchiveEntry readmeEntry = archive.Entries[0];
using(StreamReader reader=new StreamReader(readmeEntry.Open()))
{
string result= reader.ReadToEnd();
}

}
}