Silverlight to self hosted WCF - silverlight

Question

I have a silverlight application which has a WCF in it.
Since it is a self hosted WCF I've understand I have to add an interface something like:
[ServiceContract]
public interface IPolicyRetriever
{
[OperationContract, WebGet(UriTemplate = "/clientaccesspolicy.xml")]
Stream GetSilverlightPolicy();
[OperationContract, WebGet(UriTemplate = "/crossdomain.xml")]
Stream GetFlashPolicy();
}
and the implemetation:
Stream StringToStream(string result)
{
WebOperationContext.Current.OutgoingResponse.ContentType = "application/xml";
return new MemoryStream(Encoding.UTF8.GetBytes(result));
}
public Stream GetSilverlightPolicy()
{
string result = #"<?xml version=""1.0"" encoding=""utf-8""?>
<access-policy>
<cross-domain-access>
<policy>
<allow-from http-request-headers=""*"">
<domain uri=""*""/>
</allow-from>
<grant-to>
<resource path=""/"" include-subpaths=""true""/>
</grant-to>
</policy>
</cross-domain-access>
</access-policy>";
return StringToStream(result);
}
public Stream GetFlashPolicy()
{
string result = #"<?xml version=""1.0""?>
<!DOCTYPE cross-domain-policy SYSTEM ""http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"">
<cross-domain-policy>
<allow-access-from domain=""*"" />
</cross-domain-policy>";
return StringToStream(result);
}
but I don't understand the next steps I have to do in order the silverlight calls to WCF will not raise communcation exception.
Can you please show me the code I have to write and where?
(when I google it I didn't understand when the WCF calls to retrive the clientaccesspolicy, and what is the endpoint I have to add, I'm new to silverlight and WCF and don't know exaclty why I have to add an endpoint...)
this is my ServiceReference.ClientConfig:
<configuration>
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_IMapService" maxBufferSize="2147483647"
maxReceivedMessageSize="2147483647">
<security mode="None" />
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint address="http://localhost:4693/MapService.svc" binding="basicHttpBinding"
bindingConfiguration="BasicHttpBinding_IMapService" contract="MapService.IMapService"
name="BasicHttpBinding_IMapService" />
</client>
</system.serviceModel>
</configuration>
thank you!

Answer 1

Silverlight Http stack (HTTP clientaccesspolicy.xml)
Must be hosted in root of your target domain. Could be easily checked with web browser.
Silverlight checks it automatically one time.
Silverlight 3 sockets (Custom policy server)
I've already made this policy server for Silverlight for Log2Console app.
I think this code may help SL Policy Server.
It has to be hosted on special port TCP port 943.
Silverligt 4 sockets (by default as in SL3, but can be opted-in for HTTP)
Set the SocketAsyncEventArgs.SocketClientAccessPolicyProtocol property on the SocketAsyncEventArgs passed to Socket.ConnectAsync to SocketClientAccessPolicyProtocol.Http.
Silverlight possible ports range
80, 443, 4502-4532 (if allowed in clientaccesspolicy.xml)
Detailed documentation