How do I use WcfCoreMtomEncoder in a .Net Core project?

Question

I want to use this WcfCoreMtomEncoder lib here in my .Net Core project but I'm not sure how to use it syntactically.

I have this code below but can't use MessageEncoding because I'm in a .Net Core project (no mtom support):

var binding = new BasicHttpBinding(BasicHttpSecurityMode.Transport)
{ 
    // MessageEncoding = WSMessageEncoding.Mtom, not supported in .Net Core
    TransferMode = TransferMode.Streamed
};

EndpointAddress endpoint = new EndpointAddress(url);
var channelFactory = new ChannelFactory<T>(binding, endpoint);
var webService = channelFactory.CreateChannel();
user.UserName = await webService.EncryptValueAsync(userName);
user.Password = await webService.EncryptValueAsync(password);
var documentAddResult = webService.DocumentAdd(document);
channelFactory.Close();

From what I read I can replace it with this library code below and I see from the documentation for the encoder lib that the usage looks like this:

var encoding = new MtomMessageEncoderBindingElement(new TextMessageEncodingBindingElement());
var transport = new HttpTransportBindingElement();
var customBinding = new CustomBinding(encoding, transport);

var client = new MtomEnabledServiceClient(customBinding);

but I'm not sure what's what here? How would it be used to perform the document upload I'm trying to achieve? And is the library doing this or am I misunderstanding what it does?

If anyone can provide me an example of how to use this library to perform the document upload it would be appreciated.

Answer 1

Proceed as follows:

1. Generate the service client using WCF, this will result in a namespace and partial class, say DocumentWebServiceClient,
2. in the same project and namespace, create a file to extend the partial class and implement the ConfigureEndpoint method which is intended for endpoint configuration tasks:

using System.Collections.Generic;
using System.Linq;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using WcfCoreMtomEncoder;

public partial class DocumentWebServiceClient // DocumentWebServiceClient is generated by the WCF
{
    static partial void ConfigureEndpoint(ServiceEndpoint serviceEndpoint, ClientCredentials clientCredentials)
    {
        var messageEncodingBindingElementType = typeof(MessageEncodingBindingElement);
        var elements = serviceEndpoint.Binding.CreateBindingElements();

        IEnumerable<BindingElement> elementsWithoutEncodingElement = elements.Where(item => !messageEncodingBindingElementType.IsAssignableFrom(item.GetType()));
        var existingEncodingElement = (MessageEncodingBindingElement)elements.Where(item => messageEncodingBindingElementType.IsAssignableFrom(item.GetType())).First();

        var newEncodingElement = new MtomMessageEncoderBindingElement(existingEncodingElement);

        // Encoding is before transport, so we prepend the MTOM message encoding binding element
        // https://docs.microsoft.com/en-us/dotnet/framework/wcf/extending/custom-bindings
        var cb = new CustomBinding(elementsWithoutEncodingElement.Prepend(newEncodingElement));
        serviceEndpoint.Binding = cb;
    }
}