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copied!<p>What you can do is let the TempControllers be responsible for persisting itself using a generic archiver.</p> <pre><code>class TempController { private Temperature _setPoint; public Temperature SetPoint { get; set;} public ImportFrom(Archive archive) { SetPoint = archive.Read("SetPoint"); } public ExportTo(Archive archive) { archive.Write("SetPoint", SetPoint); } } class AdvancedTempController { private Temperature _setPoint; private Rate _rateControl; public Temperature SetPoint { get; set;} public Rate RateControl { get; set;} public ImportFrom(Archive archive) { SetPoint = archive.Read("SetPoint"); RateControl = archive.ReadWithDefault("RateControl", Rate.Zero); } public ExportTo(Archive archive) { archive.Write("SetPoint", SetPoint); archive.Write("RateControl", RateControl); } } </code></pre> <p>By keeping it this way, the controllers do not care how the actual values are stored but you are still keeping the internals of the object well encapsulated.</p> <p>Now you can define an abstract Archive class that all archive classes can implement.</p> <pre><code>abstract class Archive { public abstract object Read(string key); public abstract object ReadWithDefault(string key, object defaultValue); public abstract void Write(string key); } </code></pre> <p>FormatA archiver can do it one way, and FormatB archive can do it another.</p> <pre><code>class FormatAArchive : Archive { public object Read(string key) { // read stuff } public object ReadWithDefault(string key, object defaultValue) { // if store contains key, read stuff // else return default value } public void Write(string key) { // write stuff } } class FormatBArchive : Archive { public object Read(string key) { // read stuff } public object ReadWithDefault(string key, object defaultValue) { // if store contains key, read stuff // else return default value } public void Write(string key) { // write stuff } } </code></pre> <p>You can add in another Controller type and pass it whatever formatter. You can also create another formatter and pass it to whichever controller.</p>

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