WCF Service, how to get the web site URL from within a class library?

Question

I have a WCF service running in IIS that calls a function in a class library where httpContext is available. How can I dynamically get the web site url, this may also be a virtual directory?

Answer 1

I'm going to start by assuming that you're using HTTP - I'm sure you can adjust the approach depending on what your specific conditions dictate. I tried to get an answer using HttpContext as well and found out that the value was null when running under Cassini so I tried an alternative approach.

System.ServiceModel.OperationContext contains the proper request context. You can follow the request down to the actual request message and scrub the header.

Uri requestUri = System.ServiceModel.OperationContext.Current.RequestContext.RequestMessage.Headers.To;

Answer 2

You could create a ServiceHostFactory which launches your service host manually, then store the endpoint address in a static class to be used by your application. Here is a simple example:

(in your myService.svc):

<%
 @ServiceHost
 Service="MyNamespace.MyService" 
 Factory="MyNamespace.MyServiceHostFactory"
  %>

(in your MyServiceHostFactory.cs):

/// <summary>
/// Extends ServiceHostFactory to allow ServiceHostFactory to be used.
/// </summary>
public class MyServiceHostFactory : ServiceHostFactory
{
    /// <summary>
    /// Creates a new ServiceHost using the specified service and base addresses.
    /// </summary>
    /// <param name="serviceType"></param>
    /// <param name="baseAddresses"></param>
    /// <returns></returns>
    protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
    {
        ServiceHost host;
        host = new ServiceHost(serviceType, baseAddresses);

        MyGlobalStaticClass.Address = baseAddresses[0]; // assuming you want the first endpoint address.

        return host;
    }

(In your MyGlobalStaticClass.cs):

  public static string Address = "";

Answer 3

Currently I am working on WCF REST Service and I have same kind of requirement. I need service Host URL in my one of method. Here below is the different ways to get WCF REST Service Host/URL in class library.

You can use WebOperationContext class which availables in System.ServiceModel.Web namespace to getting service url. Please note this class is only for WCF REST Service.

1. WebOperationContext.Current.IncomingRequest.Headers["host"] - Gives Service Host Name

2. WebOperationContext.Current.IncomingRequest.UriTemplateMatch.BaseUri.Host - Gives Service Host Name

3. WebOperationContext.Current.IncomingRequest.UriTemplateMatch.BaseUri.AbsoluteUri - Gives Service Full Url

4. WebOperationContext.Current.IncomingRequest.UriTemplateMatch.RequestUri.AbsoluteUri - Gives Service Full Url

You can get more information about WebOperationContext class on MSDN