R – How Do I copy an existing nhibernate object as a new object

netnhibernate

I a persisted NHibernate object that I would like to repersist as a new entity. How do I get NHibernate to save this object as if it was a new?

I am thinking I might create a session interceptor to force every entity to look new and ensure the id is left blank like a new unpresisted entity would.

Best Answer

You can implement the Clone method in your class. It is up to you to decide how to do this (swallow or deep copy). The identity property must be set to the 'unsaved-value' declared in the mapping file, so that NHibernate knows it is a new object.

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C# – How to calculate someone’s age based on a DateTime type birthday

An easy to understand and simple solution.

// Save today's date.
var today = DateTime.Today;

// Calculate the age.
var age = today.Year - birthdate.Year;

// Go back to the year in which the person was born in case of a leap year
if (birthdate.Date > today.AddYears(-age)) age--;

However, this assumes you are looking for the western idea of the age and not using East Asian reckoning.

C# – How to create a new object instance from a Type

The Activator class within the root System namespace is pretty powerful.

There are a lot of overloads for passing parameters to the constructor and such. Check out the documentation at:

http://msdn.microsoft.com/en-us/library/system.activator.createinstance.aspx

or (new path)

https://docs.microsoft.com/en-us/dotnet/api/system.activator.createinstance

Here are some simple examples:

ObjectType instance = (ObjectType)Activator.CreateInstance(objectType);

ObjectType instance = (ObjectType)Activator.CreateInstance("MyAssembly","MyNamespace.ObjectType");

Best Answer

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C# – How to calculate someone’s age based on a DateTime type birthday

C# – How to create a new object instance from a Type

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