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Features

• Mark a class with AddDeepCopyConstructor-Attribute to create a deep copy constructor.
• Mark a static method with DeepCopyExtension-Attribute to create a nullable deep copy method that supports inheritance.
• Mark an existing copy constructor with InjectDeepCopy to insert deep copy instructions before your code. Details
• Mark a property with IgnoreDuringDeepCopy to skip this property.
• Mark a property with DeepCopyByReference to copy by reference.
• Collections of types IList<>, ISet<> and IDictionary<,> are supported and described here

Start with DeepCopyExtension

To create a compileable method you can call simply return the parameter:

[DeepCopyExtension]
public static MyType DeepCopy(this MyType myType) => myType;

or throw an exception

[DeepCopyExtension]
public static MyType DeepCopy(this MyType myType) => throw new NotImplementedException();

What gets compiled

public static MyType DeepCopy(this MyType myType) {
    return myType != null ? new MyType(myType) : null;
}

and MyType will automatically receive a deep copy constructor.

Not supported

• Fields
• Properties of types without copy constructor
• Properties of type System.Object
• Collection parameterized with System.Object like IList<object>