Transferring large payloads of data (Serialized Objects) using wsHttp in WCF with message security

Question

I have a case where I need to transfer large amounts of serialized object graphs (via NetDataContractSerializer) using WCF using wsHttp. I\'m using message security and woul

Answer 1

i used to implement kinda passing big text to/from wcf. my trig is convert it to stream and use GZipStream to compress it then send it as byte[], luckily its never exceed 10 MB.

In your case i recommend do fragmentation. Convert Serialized object to byte[] and then merg it and decompress

psudo

int transferSize = 5000000; // 5MB
byte[] compressed = ...;
var mem = new System.IO.MemoryStream(compressed);

for(int i = 0; i < compressed .length; i+= transferSize )
{
    byte[] buffer = new byte[transferSize];
    mem.Read(buffer, i, compressed);
    mem.Flush();
    sendFragmentToWCF(buffer);
}

edit 08 Dec 2010

ok based on my understanding, the situation is client is download some large serialize object throught WCF. i didn't particularly test on this solution, but guess it should work. The key is save serialized object to file and use Response transmit that file.

[WebMethod]
public void GetSerializedObject()
{
    string path = @"X:\temp.tmp";

    var serializer = new  System.Runtime.Serialization.NetDataContractSerializer();
    var file = new System.IO.FileStream(path, System.IO.FileMode.CreateNew);

    try
    {
        serializer.Serialize(file, ...);
        this.Context.Response.TransmitFile(path);
        this.Context.Response.Flush();
    }
    finally
    {
        file.Flush();
        file.Close();
        file.Dispose();
        System.IO.File.Delete(path);
    }
}

WCF shoud do file streaming automatically and u dont ahve to worry about serialized object size since we use file transmit. Dont forget to the config response limit.