一。
public byte[] Unzip(byte[] data)
    {
        MemoryStream mstream = new MemoryStream(data);
        ZipInputStream zipInputStream = new ZipInputStream(mstream);
        byte[] byteUncompressed = new byte[zipInputStream.Length];
        zipInputStream.Read(byteUncompressed, 0, (int)byteUncompressed.Length);

        zipInputStream.Close();
        mstream.Close();

        return byteUncompressed;
    }

二。
public static byte[] DeCompression(byte[] compressedByte)  
        {  
            MemoryStream ms = new MemoryStream();  
            byte[] writeData = new byte[4096];
            using (Stream s2 = new ICSharpCode.SharpZipLib.Zip.ZipInputStream(new MemoryStream(compressedByte)))  
            {  
                while (true)  
                {  
                    int size = s2.Read(writeData, 0, writeData.Length);  
                    if (size > 0)  
                    {  
                        ms.Write(writeData, 0, size);  
                    }  
                    else  
                    {  
                        break;  
                    }  
                }  
                s2.Close();  
            }  
            return ms.ToArray();  
        }   


网上找了一堆相关代码，都是有问题。
不是什么幻数，就是未知块等错误，给看看有什么方法解决。

把编译错误的截图贴出来啊，你贴一段代码怎么帮你看啊

图一定要清楚，要不就把错误信息贴出来