How to inject WCF service client in ASP.Net core?

Question

I have WCF service that I need to access from ASP.NET Core. I have installed WCF Connected Preview and created proxy successfully.

It created interface & client

Answer 1

Using the factory method overload seems suitable use case for it.

services.AddScoped(provider => {
    var client = new DocumentIntegrationClient();

    // Use configuration object to read it from appconfig.json
    client.ClientCredentials.UserName.UserName = Configuration["MyService:Username"];
    client.ClientCredentials.UserName.Password = Configuration["MyService:Password"];
    client.Endpoint.Address = new EndpointAddress(Configuration["MyService:BaseUrl"]);

    return client;
});

Where your appsettings would look like

{
    ...
    "MyService" : 
    {
        "Username": "guest",
        "Password": "guest",
        "BaseUrl": "http://www.example.com/"
    }
}

Alternatively, inject the Options via options pattern. Since the DocumentIntegrationClient is partial, you can create a new file and add a parameterized constructor.

public partial class DocumentIntegrationClient :
    System.ServiceModel.ClientBase, ServiceReference1.IDocumentIntegration
{
    public DocumentIntegrationClient(IOptions options) : base()
    {
        if(options==null)
        {
            throw new ArgumentNullException(nameof(options));
        }

        this.ClientCredentials.Username.Username = options.Username;
        this.ClientCredentials.Username.Password = options.Password;
        this.Endpoint.Address = new EndpointAddress(options.BaseUrl);
    }
}

And create a options class

public class DocumentServiceOptions
{
    public string Username { get; set; } 
    public string Password { get; set; }
    public string BaseUrl { get; set; }
}

and populate it from appsettings.json.

services.Configure(Configuration.GetSection("MyService"));