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POXmlSerializer requires XmlInclude for public method with generic constraint if type in another assembly AND requires that type to be serialiable!
 

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  1. POXmlSerializer requires XmlInclude for public method with generic constraint if type in another assembly AND requires that type to be serialiable!
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    <p>Consider the following. You have a class that you want to serialize with XmlSerializer which has a public generic method with a type constraint where the type is in a different assembly:</p> <pre><code>using BarStuff; namespace FooStuff { public class Foo { ... public T GetBar&lt;TBar, T&gt;( string key ) where TBar : Bar&lt;T&gt; { ... } } } </code></pre> <p>You wouldn't expect the XmlSerializer to even concern itself with methods, and generally it doesn't. The following both work fine:</p> <pre><code>//private, serializer doesn't care about it private T GetBar&lt;TBar, T&gt;( string key ) where TBar : Bar&lt;T&gt; { ... } //no generic type constraint, serializer also doesn't care about it public Bar GetBar( string key ) { ... } </code></pre> <p>Also, if the type Bar is in the same assembly as Foo then the serializer will also be perfectly happy.</p> <p>When you execute the first example, if Bar is defined in a separate assembly you will get a runtime exception saying that you need to add a reference to the assembly containing Bar, <em>even if you already have that assembly in your project references</em>. You can get around this by using XmlInclude:</p> <pre><code>[XmlInclude(typeof(Bar))] public class Foo { public T GetBar&lt;TBar, T&gt;( string key ) where TBar : Bar&lt;T&gt; { ... } } </code></pre> <p>However if Bar is not serializable, and there's no reason why it should be, you'll now get a runtime exception the first time it hits something it can't serialize, such as a public property that returns an interface as its type, a class without a parameterless constructor etc.!</p> <p>Related but not as detailed: <a href="https://stackoverflow.com/questions/2361563/xmlserializer-is-throwing-invalidoperationexception-when-using-the-generic-type-c">XmlSerializer is throwing InvalidOperationException when using the generic type constraint where</a></p> <p>Also: <a href="http://connect.microsoft.com/VisualStudio/feedback/details/203076/xmlserializer-does-not-work-on-type-with-constrained-generic-method" rel="nofollow noreferrer">Microsoft's take on the problem</a></p>
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    1. COWould you want to try this answer from the other question you have mentioned? - http://stackoverflow.com/questions/2361563/xmlserializer-is-throwing-invalidoperationexception-when-using-the-generic-type-c/2381606#2381606
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    2. COI saw that :) But as mentioned above, when you [XmlInclude(typeof(Bar))] the XmlSerializer will fail if Bar isn't serializable, even though it is never serialized, and there is no reason that Bar should have to be serializable.
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