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    <p>To answer your question you can have your cake and eat it too in StructureMap. You can configure your container from code and push in that extra bit of config you need from the application configuration. That is what <a href="http://structuremap.sourceforge.net/RegistryDSL.htm" rel="nofollow noreferrer">EqualToAppSetting</a> is for.</p> <p>Create a settings class</p> <pre><code> public class DatabaseSettings { public DatabaseSettings(string type, string connectionString) { Type = type; ConnectionString = connectionString; } public string Type { get; set; } public string ConnectionString { get; set; } } </code></pre> <p>Next tell StructureMap to configure it using your application settings.</p> <pre><code> [Test] public void setup_concrete_class_via_application_configuration() { var container = new Container(config =&gt; { config.ForConcreteType&lt;DatabaseSettings&gt;().Configure .Ctor&lt;string&gt;("type").EqualToAppSetting("dovetail.database.type", "mssql") .Ctor&lt;string&gt;("connectionString").EqualToAppSetting("dovetail.database.connectionString"); }); var databaseSettings = container.GetInstance&lt;DatabaseSettings&gt;(); databaseSettings.Type.ShouldEqual("mssql"); databaseSettings.ConnectionString.ShouldEqual("Data Source=.; Initial Catalog=dovetail;User Id=sa;Password=sa;"); } </code></pre> <p>Finally here is what the application settings look like in my application config:</p> <pre><code> &lt;appSettings&gt; &lt;add key="dovetail.database.type" value="mssql"/&gt; &lt;add key="dovetail.database.connectionString" value="Data Source=.;Initial Catalog=dovetail;User Id=sa;Password=sa;"/&gt; &lt;/appSettings&gt; </code></pre>
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    1. POXml configuration or Configuration through code?
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    1. COI did think about this, but the downside to me was that I would have to track the connectionstring at two places. one here and once in the connectionstring section of the web/app.config... Thanks for the reply :)
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      1. USAmith George
    2. COam using your suggestion at the moment to solve my connection string issue. At the application start I edit the web.config to include a new app setting called connectionString. It gets its value from the connectionString defined in the proper connectionStrings section. Thus I have to modify the connection string only at one place. and my structuremap config can read it from the appsettings... thanks!
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      1. USAmith George
    3. COHappy to help. We baked a way to conventionally pull config into settings objects to avoid any container configuration. I should really blog about that.
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