如何从未与虚拟目录在同一服务器上运行的WCF服务访问虚拟目录？

Question

I have a WCF service called "SQLInterfaceLibrary" that is running on a machine via WcfSvcHost.exe. I can call all of its endpoints using WcfTestClient.exe by connecting to the URI " http://localhost:8733/Design_Time_Addresses/SQLInterfaceLibrary/mex ". In fact, I can even connect to it directly from a C# application by using the "References.cs" file that I generate by calling SvcUtil.exe. However, the requirements of my project state that I must access an IIS virtual directory from this service. I found another StackOverflow post that suggests using the "HttpContext.Current.Server.MapPath" function. However, when I call this from within my service, I get the following error:

"System.NullReferenceException:'Object reference not set to an instance of an object.'"

I think this is happening, because I am trying to access a virtual directory on a different machine. Can anyone with experience in WCF programming vouch for this? You don't need to provide a detailed explanation, just yes or no. Thanks!

Answer 1

By default, wcf's httpcontext is null, you should set aspNetCompatibilityEnabled to true in your web.config .

   <serviceHostingEnvironment aspNetCompatibilityEnabled="true"
  multipleSiteBindingsEnabled="true" />

If httpcontext is still null, you could add AspNetCompatibilityRequirements attribute to your service

[AspNetCompatibilityRequirements(RequirementsMode =AspNetCompatibilityRequirementsMode.Required)]
public class CalculatorService : ICalculatorService
{
    public double Add(double a, double b)
    {
      HttpContext context=  HttpContext.Current;
      string dir =  Directory.GetCurrentDirectory();
        return a + b;
    }
}