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I migrate project from .NET Framework 4.8 to .NET Core 3.1, regenerate Connected Service WCF with "dotnet-svcutil.

Old .NET Framework config

<wsHttpBinding> <binding name="wsHttpBindingTransportSecurity" sendTimeout="00:03:00" maxBufferPoolSize="50000000" maxReceivedMessageSize="100000000" messageEncoding="Mtom"> <readerQuotas maxStringContentLength="50000000" maxArrayLength="50000000" maxBytesPerRead="50000000" maxNameTableCharCount="50000000" /> <security mode="Transport"> <transport clientCredentialType="Certificate" /> </security> </binding> </wsHttpBinding> ... <endpoint address="" behaviorConfiguration="BusinessToBusinessTransportSecurity" binding="wsHttpBinding" bindingConfiguration="wsHttpBindingTransportSecurity" contract="***.Au10tix.FilesWorker.IAu10tixFromFilesWorker" name="Au10tixWorker" />

How I can migrate this to programmaticaly config with .NET Core 3.1? I tried use WcfCoreMtomEncoder NuGet package. Then I created CustomBinding with MTOM encoding and HttpsTransportBindingElement(), then create client and tried SetCertificate like this:

var encoding = new MtomMessageEncoderBindingElement(new TextMessageEncodingBindingElement()); var transport = new HttpsTransportBindingElement(); transport.TransferMode = TransferMode.Streamed; var binding = new CustomBinding(encoding, transport); var remoteAddress = new EndpointAddress("https://***.au10tixservicesstaging.com/Au10tixBos2/Au10tixFromFilesWorker.svc"); client = new Au10tixFromFilesWorkerClient(binding, remoteAddress); client.ChannelFactory.Credentials.ClientCertificate.SetCertificate(StoreLocation.CurrentUser, StoreName.My, X509FindType.FindByThumbprint, "***************************");

I would be use WsHttpBinding, with this binding auth with Certificate is good, but I got exception with deserialization. I think because with this case not configurate MTOM MessageEncoding, but for WSHttpBinding I can't set this property:

The content type multipart/related; type="application/xop+xml"; start="<http://tempuri.org/0>"; boundary="uuid:b7265fdd-d353-42e6-a2d2-bd4c2869bcf8+id=1715"; start-info="application/soap+xml" of the response message does not match the content type of the binding (application/soap+xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 1024 bytes of the response were: ' --uuid:b7265fdd-d353-42e6-a2d2-bd4c2869bcf8+id=1715 Content-ID: <http://tempuri.org/0> Content-Transfer-Encoding: 8bit Content-Type: application/xop+xml;charset=utf-8;type="application/soap+xml" <s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing"><s:Header><a:Action s:mustUnderstand="1">Au10tixServices/IAu10tixFromFilesWorker/UploadAndBeginProcessingDocumentResponse</a:Action><a:RelatesTo>urn:uuid:8aa60e70-7524-4cbd-a22f-4a9cb6af25db</a:RelatesTo></s:Header><s:Body><UploadAndBeginProcessingDocumentResponse xmlns="Au10tixServices"><UploadAndBeginProcessingDocumentResult xmlns:b="http://schemas.datacontract.org/2004/07/Au10tix.Bos.ServiceContracts.DataContracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><b:DocumentId>C46352D18BB746A28BE7AB6C14AB9613</b:DocumentId><b:RequestState>QueuedForProcessing</b:RequestState></UploadAndBeginProcessingDocumentResult></UploadAndBeginProcessingDocumentResponse></s:Body></s:Envelope> --uuid:b7265fdd-d'.

I used googling two days but not found nothing for solution of this problem.

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Omg, I found solution for this! My code for using MTOM and ClientCertificate:

var tempBinding = new WSHttpBinding(); tempBinding.Name = "wsHttpBindingTransportSecurity"; tempBinding.SendTimeout = TimeSpan.FromMinutes(3); tempBinding.MaxBufferPoolSize = 50000000; tempBinding.MaxReceivedMessageSize = 100000000; tempBinding.SendTimeout = TimeSpan.FromMinutes(3); tempBinding.ReaderQuotas = new System.Xml.XmlDictionaryReaderQuotas { MaxArrayLength = 50000000, MaxBytesPerRead = 50000000, MaxNameTableCharCount = 50000000, MaxStringContentLength = 50000000 }; tempBinding.Security.Mode = SecurityMode.Transport; tempBinding.Security.Transport = new HttpTransportSecurity { ClientCredentialType = HttpClientCredentialType.Certificate }; var messageEncodingBindingElementType = typeof(MessageEncodingBindingElement); var elements = tempBinding.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://learn.microsoft.com/en-us/dotnet/framework/wcf/extending/custom-bindings var binding = new CustomBinding(elementsWithoutEncodingElement.Prepend(newEncodingElement)); var remoteAddress = new EndpointAddress(_settingsProvider.GetStringSetting(WorkerEndpointAddressConfigurationKey)); var client = new Worker.Au10tixFromFilesWorkerClient(binding, remoteAddress); client.ClientCredentials?.ClientCertificate.SetCertificate (StoreLocation.CurrentUser,StoreName.My, X509FindType.FindByThumbprint,"**********");

Source post for my solution: https://stackoverflow.com/a/63669041/7429947

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this solution does not work with .NET 6. In particular this code 'var elements = customBinding.CreateBindingElements();' throws NotSupportedExcepton

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