net 4.5(.NET4.5如何实现压缩)

在.NET 4.5中新加入的压缩的命名空间和方法。可以抛弃ICSharpCode.SharpZipLib.dll 这个类库了。性能上不相上下。但是能够大大简化你的代码。如果开始使用.NET FrameWork4.5 做压缩不妨试试自带的压缩方法.

传统使用ICSharpCode.SharpZipLib.dll 所写的代码。

代码如下:

static void Main(string[] args)
{
Stopwatch watch = new Stopwatch();
watch.Start();
string path = @"E:\";
Compress(directory.getfiles(path), @"F:\4.0.zip");
watch.Stop();
console.writeline("消耗时间:{0}", watch.ElapsedMilliseconds);
FileInfo f = new FileInfo(@"F:\4.0.zip");
Console.WriteLine("文件大小{0}", f.Length);
}

static void Compress(string[] filePaths, string zipFilePath)
{
byte[] _buffer = new byte[4096];
if (!directory.exists(zipFilePath))
Directory.createdirectory(Path.GetDirectoryName(zipFilePath));
using (ZipOutputStream zip = new ZipOutputStream(File.Create(zipFilePath)))
{
foreach (var item in filePaths)
{
if (!File.Exists(item))
{
Console.WriteLine("the file {0} not exist!", item);
}
else
{
ZipEntry entry = new ZipEntry(Path.GetFileName(item));
entry.DateTime = DateTime.Now;
zip.PutNextEntry(entry);
using (FileStream fs = File.OpenRead(item))
{
int sourceBytes;
do
{
sourceBytes = fs.Read(_buffer, 0, _buffer.Length);
zip.Write(_buffer, 0, sourceBytes);
} while (sourceBytes > 0);
}
}
}
zip.Finish();
zip.Close();
}
}

使用.NET FrameWork 4.5中自带的压缩。

代码如下:

static void Main(string[] args)
{
Stopwatch watch = new Stopwatch();
watch.Start();
string path = @"E:\";
Compress(path, @"F:\4.5.zip");
watch.Stop();
Console.WriteLine("消耗时间:{0}", watch.ElapsedMilliseconds);
FileInfo f = new FileInfo(@"F:\4.5.zip");
Console.WriteLine("文件大小{0}", f.Length);
}
static void Compress(string filePath, string zipFilePath)
{
ZipFile.CreateFromDirectory(filePath, zipFilePath, CompressionLevel.Fastest, false);
}