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    <p>You can use <a href="http://msdn.microsoft.com/en-us/library/ee207183.aspx" rel="nofollow">covariance</a>. Since variant type parameters only can be declared in interfaces and delegates (not in class definitions), you also need to define an interface:</p> <pre><code>public interface IGenericObject&lt;out T&gt; { string Key { get; } T Value { get; } } public abstract class GenericObject&lt;T&gt; : IGenericObject&lt;T&gt; { public string Key { get; set; } public T Value { get; set; } protected GenericObject() { } protected GenericObject(string key, T value) : this() { this.Key = key; this.Value = value; } } public class GenericList&lt;TGenericObject&gt; : IXmlSerializable where TGenericObject : IGenericObject&lt;object&gt; { private readonly List&lt;TGenericObject&gt; _list = new List&lt;TGenericObject&gt;(); public void Add(TGenericObject item) { _list.Add(item); } public XmlSchema GetSchema() { // ... } public void ReadXml(XmlReader reader) { // ... } public void WriteXml(XmlWriter writer) { // ... } } public class Person : GenericObject&lt;string&gt; { } </code></pre> <p>Now you can do this:</p> <pre><code>public class SomeClass { public void SomeMethod() { Person somePerson = new Person(); GenericList&lt;IGenericObject&lt;object&gt;&gt; listWithGenericsOfObject = new GenericList&lt;IGenericObject&lt;object&gt;&gt;(); listWithGenericsOfObject.Add(somePerson); GenericList&lt;IGenericObject&lt;string&gt;&gt; listWithGenericsOfString = new GenericList&lt;IGenericObject&lt;string&gt;&gt;(); listWithGenericsOfString.Add(somePerson); GenericList&lt;Person&gt; listWithGenericsOfPerson = new GenericList&lt;Person&gt;(); listWithGenericsOfPerson.Add(somePerson); } } </code></pre> <p>Now you don't need to check the type at runtime using IsAssignableFrom. However, in case you will need it, you should swap the types like this:</p> <pre><code>typeof(GenericObject&lt;object&gt;).IsAssignableFrom(typeof(T)) </code></pre>
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    1. COWow, really nice solution, although I do not exactly know why it works :D If I could I would give this answer 100 votes
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    2. COTo understand why it works, I think you need to read about variance (covariance in particular). The 'out'-keyword in the interface specifies that the type parameter is covariant.
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    3. COAnd this simple keyword is the magic?! Sometimes it´s so simple...
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