CODEWITHSUNDEEP
c#asp.netxml
IMMORTAL
IMMORTAL

Reputation: 2857

How to compress the xml file at the time of Writing

I ave writing an XML File of size more than 1GB but at the time of writing I want to compress that file so that the size of an xml file is reduces so that at tile of xmlDoc.Load(fileName) load the file in minimum time duration. my code for Writing an XML File is

 using (FileStream fileStream = new FileStream(_logFilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite))
                {
                    xmlDoc.Load(fileStream);
                    int byteLenght = fileStream.ReadByte();
                    byte[] intBytes = BitConverter.GetBytes(byteLenght);
                    intBytes = Compress(intBytes);
                    xmlDoc.DocumentElement.AppendChild(newelement);
                    fileStream.SetLength(0);
                    xmlDoc.Save(fileStream);
                }

also for compression

private static byte[] Compress(byte[] data)
        {
            byte[] retVal;
            using (MemoryStream compressedMemoryStream = new MemoryStream())
            {
                DeflateStream compressStream = new DeflateStream(compressedMemoryStream, CompressionMode.Compress, true);
                compressStream.Write(data, 0, data.Length);
                compressStream.Close();
                retVal = new byte[compressedMemoryStream.Length];
                compressedMemoryStream.Position = 0L;
                compressedMemoryStream.Read(retVal, 0, retVal.Length);
                compressedMemoryStream.Close();
                compressStream.Close();
            }
            return retVal;
        }

but its not work for compression the file.

Upvotes: 0

Views: 1107

Answers (1)

gerrard00
gerrard00

Reputation: 1738

Compressing the file on disk won't do much to improve the time spent loading the document, because the larger part of the time is in building up the object graph for the XmlDocument. It is so slow that it can take as long (or longer) as reading the uncompressed XML from disk. Although compression can save time here, it's only a minor gain if a fast media like an internal hdd is used.

If you want to improve performance working with large XML files, you'll need to use something like an XmlReader that streams the file instead of loading it all at once.

Upvotes: 1

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