Generic Deep Copy in C# for user defined classes

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Deep cloning objects 39 answers

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Try using a copy constructor for each of your classes, that can clone all your fields. You might also want to introduce an interface, eg called IDeepCloneable , that forces classes to implement a method DeepClone() which calls the copy constructor. To get the cloning type-safe without casting you can use a self-referential structure.

Take a look at the following:

interface IDeepCloneable<out T>
{
    T DeepClone();
}

class SomeClass<T> : IDeepCloneable<T> where T : SomeClass<T>, new()
{        
    // copy constructor
    protected SomeClass(SomeClass<T> source)
    {
        // copy members 
        x = source.x;
        y = source.y;
        ...
   }

    // implement the interface, subclasses overwrite this method to
    // call 'their' copy-constructor > because the parameter T refers
    // to the class itself, this will get you type-safe cloning when
    // calling 'anInstance.DeepClone()'
    public virtual T DeepClone()
    {
        // call copy constructor
        return new T();
    }

    ...
}

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