error: PlatformNotSupportedException: Configuration files are not supported or How .NET Core 6 consume SOAP .NET Framework wcf

I have Dot Net Framework 3.5 Web Service: http://www.dneonline.com/calculator.asmx I want to consume it on dot Net Core (3 or 6, any version).

When I run the program, it throws exception: PlatformNotSupportedException: Configuration files are not supported

Is it technically possible or not to call WCF Dot Net Framework 3.5 from any Dot Net Core application?

Reference: https://medium.com/compendium/integrating-with-soap-web-services-in-net-core-adebfad173fb https://howtodomssqlcsharpexcelaccess.blogspot.com/2019/06/mvc-consume-web-service-service.html

Solution

My mentor gave me an article that provided the answer. Mister Khalidabuhakmeh does a great job explaining how to consume SOAP APIs in .NET Core; thank you!

To summarize their steps:

Check if you installed .NET Core 2.1; if not, download from Microsoft and install.
Open Visual Studio 2019 or Visual Studio 2022.
- Create a .NET Core Console App.
- Go to View, then click Terminal.
- At the terminal, input:
```
dotnet new tool-manifest
```
At the Terminal, input:
```
dotnet tool install dotnet-svcutil
```

At the Terminal, input:

dotnet dotnet-svcutil https://www.dataaccess.com/webservicesserver/TextCasing.wso

If you have synchronous operations and you do have synchronous operations, then:

At Terminal input: --sync

dotnet dotnet-svcutil https://www.dataaccess.com/webservicesserver/TextCasing.wso --sync

More information

Input the other WSDL link:

dotnet dotnet-svcutil <wsdl url>

Consume SOAP:

 static async Task Main(string[] args)
 {
 var client = new TextCasingSoapTypeClient(
     TextCasingSoapTypeClient.EndpointConfiguration.TextCasingSoap,
     "https://www.dataaccess.com/webservicesserver/TextCasing.wso");

 var result =
     await client.AllLowercaseWithTokenAsync("THIS IS A STRING", "");

 // result: this is a string
 var value = result.Body.AllLowercaseWithTokenResult;

 Console.WriteLine(value);
}