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// MyGenericClass derives from Object, while



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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

// MyGenericClass derives from Object, while

// contained items must have a default ctor.

public class MyGenericClass where T : new()

{...}

// MyGenericClass derives from Object, while

// contained items must be a class implementing IDrawable

// and support a default ctor.

public class MyGenericClass where T : class, IDrawable, new()

{...}

// MyGenericClass derives from MyBase and implements ISomeInterface,

// while the contained items must be structures.

public class MyGenericClass : MyBase, ISomeInterface where T : struct

{...}

On a related note, if you are building a generic type that specifies multiple type parameters,



you can specify a unique set of constraints for each:

// must have a default ctor, while must

// implement the generic IComparable interface.

public class MyGenericClass where K : new()

where T : IComparable

{...}


To see the usefulness of applying constraints, if you wish to update CarCollection to ensure

that only Car-derived types can be placed within it, you could write the following:

public class CarCollection : IEnumerable where T : Car

{

...



public void PrintPetName(int pos)

{


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