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POIoC, factories and constructor arguments
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  1. POIoC, factories and constructor arguments
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    copied!<p>I'm a beginner struggling with IoC and DI. I'd like to be able to resolve the connection and connection factory dynamically using autofac (or any other suitable .NET IoC tool). </p> <p>A scenario could be changing the connection implementation to another one with more facilities for tracing etc.</p> <p>When I apply DI and IoC to the code below, I get a mess of namedParameter in constructors etc. The connection factory returns a new connection with a unique port (silly example, just to show I need to keep some sort of state in the factory)</p> <p>I figure I could use property injection for the IP and port range, but that way, I wouldn't be guaranteed that the connections would have an IP or port, which is the point of a constructor. Also, the named parameters make me dependent on the names of the arguments as well.</p> <p>Ideas, patterns, IoC pointers are much appreciated! </p> <p><strong>Update:</strong></p> <p>More specific: How could I change the connection class to be injectable? Should I go with property injection? Or any tricks I could do get a more type-safe resolving with constructor arguments?</p> <pre><code>public interface IConnection { void Open(); void Close(); string Execute(string command); } public interface IConnectionFactory { IConnection CreateConnection(); } public class Connection : IConnection { ... public Connection(String ip, int port) { _ip = ip; _port = port; } public string Execute() {} public void Open() {} public void Close() {} } public class ConnectionFactory : IConnectionFactory { //How would I resolve this? public ConnectionFactory(string ip, int fromPort) { ... } public IConnection CreateConnection() { //How would I resolve this? return new Connection(ip, fromPort++); } } </code></pre> <p>Now, the usage:</p> <pre><code>//Register builder.RegisterType&lt;Connection&gt;().As&lt;IConnection&gt;(); builder.RegisterType&lt;ConnectionFactory&gt;().As&lt;IConnectionFactory&gt;().SingleInstance(); ... var connection = container.Resolve&lt;IConnectionFactory&gt;( new NamedParameter("ip", "127.0.0.1"), new NamedParameter("fromPort", 80).CreateConnection()); </code></pre>
 

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