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POImplicit conversion between types in C#
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copied!<p>I have the following business objects:</p> <pre><code> public abstract class Product { public int Id { get; set; } public bool OnStock { get; set; } } public class ProductForImport : Product { public int ImportId { get; set; } } public class ProductForExport : Product { public int ExportId { get; set; } public bool IsExportable { get; set; } public bool IsUsable { get; set; } public string OtherParam {get; set;} public static implicit operator ProductForExport(ProductForImport pfi) { ProductForExport p = new ProductForExport(); p.Id = pfi.Id; p.IsExportable = true; p.ExportId = 0; return p; } } </code></pre> <p>so I can convert between the two types:</p> <pre><code> static void Main(string[] args) { ProductForExport pfe = new ProductForExport(); pfe.Id = 1; pfe.OnStock = true; ProductForImport pfi = new ProductForImport(); pfi.ImportId = 200; ProductForExport pfe2 = (ProductForExport)pfi; } </code></pre> <p>this works OK. </p> <p>I have 100.000 ProductsForImport items. If I understand correctly, if I convert them to ProductsForExport items, I'll have 100.000 +100.000 items in memory - that's reasonable.</p> <p>My problem is: I have to send these "ProductForExport" objects through JSON services, each service just need some subset of the properties of each type:</p> <p>servicecall1 should return <code>ProductForExport1{ExportId,IsExportable}</code></p> <p>servicecall2 should return <code>ProductForExport2{ExportId,IsUsable}</code></p> <p>Question: should I write an implicit conversion similar to the above example for these new types - <code>ProductForExport1</code> and <code>ProductForExport2</code> (so basically create 100.000+100.000 new objects)</p> <p>or </p> <p>somehow can I just "hide" the unwanted properties with some magic from the original type without the need to create new instances?</p> <p>thanks,</p> <p>b.</p>

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