EF has generated for me some partial classes, each with a constructor, but it says not to touch them (example below), now if I make my own secondary partial class and I want to have a constructor that automatically sets some of the fields how do I do so as it would conflict?
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated from a template.
//
// Manual changes to this file may cause unexpected behavior in your application.
// Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
namespace Breakdown.Models
{
using System;
using System.Collections.Generic;
public partial class Call
{
public Call()
{
this.Logs = new HashSet<Log>();
}
...
}
}
Partial methods can help you here, in the T4 Templates define a body-less partial method and call that inside the constructor.
Then in your partial class define the partial method and place inside that what you want to do in the constructor. If you don't want to do anything then you don't need to define the partial method.
http://msdn.microsoft.com/en-us/library/vstudio/6b0scde8.aspx
This is not possible.
Partial classes are essentially parts of the same class.
No method can be defined twice or overridden (same rule apply for the constructor also)
But You can use below mentioned Workaround :
for more information check Partial Classes, Default Constructors
I hope this will help to you.
I wanted to do the same recently and ended up modifying the T4 template so I could implement my own parameterless constructor manually. To accomplish this you can remove the constructor from the generated classes and move the instantiation of collections etc to outside the constructor so this:
becomes this:
The drawback I suppose is that the generated classes are not as "clean". That is you can't just have auto-implemented properties for your complex/nav types.
In your model.tt file you can prevent the constructor generation by removing the below code, commenting it out or by just putting in a false into the conditional so it never gets executed:
Then below this you need to do some modification where properties are generated for your complex and navigation types. Add a private var with object instantiation and a property for accessing the private var for each of these eg:
Depending on the complexity of your model there may be other areas you need to modify. Hopefully this gets you started.
If I well understand the question, you need this constructor when creating a new entity, that is an entity that was not persisted before.
My case was to set a default value to all datetime, that is initalize them to "the begining of time" : 1900-01-01.
In this case I use an entity factory
Each time I need a new Entity I use
with SetDefaults as :
full code is here
It could be rewrittent to consider the entity type and so on...
Add a base class:
Add the partial class implementation in another file
The drawback is that the Initialization method will be called before the all collection creature.