C#自带DeflateStream，生成后的文件和javat生成的不一样，搜索了一下，找到国外一篇文章：

http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/65537603-d7db-4e66-b5e6-d08275a4e4c8/

也是同样的问题，其中的一个回复是：

The problem is that DeflateStream in c# does not use the same compression algorithm than Deflater in java(and probably objective C).

Instead, try to use the zlib.net library:

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下载引用zlib.net，调用CompressFile()方法，问题解决。

public static void CopyStream(System.IO.Stream input, System.IO.Stream output)        {            byte[] buffer = new byte[2000];            int len;            while ((len = input.Read(buffer, 0, 2000)) > 0)            {                output.Write(buffer, 0, len);            }            output.Flush();        }        private void compressFile(string inFile, string outFile)        {                       System.IO.FileStream outFileStream = new System.IO.FileStream(outFile, System.IO.FileMode.Create);            zlib.ZOutputStream outZStream = new zlib.ZOutputStream(outFileStream, zlib.zlibConst.Z_DEFAULT_COMPRESSION);            System.IO.FileStream inFileStream = new System.IO.FileStream(inFile, System.IO.FileMode.Open);            try            {                CopyStream(inFileStream, outZStream);            }            finally            {                outZStream.Close();                outFileStream.Close();                inFileStream.Close();            }        }        private void decompressFile(string inFile, string outFile)        {            System.IO.FileStream outFileStream = new System.IO.FileStream(outFile, System.IO.FileMode.Create);            zlib.ZOutputStream outZStream = new zlib.ZOutputStream(outFileStream);            System.IO.FileStream inFileStream = new System.IO.FileStream(inFile, System.IO.FileMode.Open);            try            {                CopyStream(inFileStream, outZStream);            }            finally            {                outZStream.Close();                outFileStream.Close();                inFileStream.Close();            }        }