如何确定字符串的大小并对其进行压缩

要知道字符串的“大小”(以KB为单位),我们需要知道编码。如果我们假设为utf8,那么它(不包括bom等)如下(如果不是utf8,则交换编码):

int len = Encoding.UTF8.GetByteCount(longString);

重新打包;我建议gzip使用utf8,如果必须是字符串,可以选择后跟base-64:

    using (MemoryStream ms = new MemoryStream())
    {
        using (GZipStream gzip = new GZipStream(ms, CompressionMode.Compress, true))
        {
            byte[] raw = Encoding.UTF8.GetBytes(longString);
            gzip.Write(raw, 0, raw.Length);
            gzip.Close();
        }
        byte[] zipped = ms.ToArray(); // as a BLOB
        string base64 = Convert.ToBase64String(zipped); // as a string
        // store zipped or base64
    }

给这个函数解压字节。我能想到的最好方法是

public static byte[] ZipToUnzipBytes(byte[] bytesContext)
        {
            byte[] arrUnZipFile = null;
            if (bytesContext.Length > 100)
            {
                using (var inFile = new MemoryStream(bytesContext))
                {
                    using (var decompress = new GZipStream(inFile, CompressionMode.Decompress, false))
                    {
                        byte[] bufferWrite = new byte[4];
                        inFile.Position = (int)inFile.Length - 4;
                        inFile.Read(bufferWrite, 0, 4);
                        inFile.Position = 0;
                        arrUnZipFile = new byte[BitConverter.ToInt32(bufferWrite, 0) + 100];
                        decompress.Read(arrUnZipFile, 0, arrUnZipFile.Length);
                    }
                }
            }
            return arrUnZipFile;
        }