generating partial class

[Sakar]

How to generate partial class to override the properties before get and set takes place.

Please kindly explain.

[Dimitar Tachev]

Hello Sakar,

In general you cannot override methods or properties from a partial class because actually that is still the same class. 

In order to insert some code before get and set methods in your properties I suggest you to modify the code generation template that is used by OpenAccess ORM to generate the entities. 

According to your needs I suggest you to choose one of the following options:

1. If you need to do the same operations in all of the properties – modify your code generation template to add two partial methods and call them before each get and set method like below:

partial void BeforeGet();
partial void BeforeSet(object newValue); // optionally add argument for the old value
...
public virtual object Something
{
   get
   {
       this.BeforeGet();
       return this._ something;
   }
   set
   {
       this.BeforeSet(value);
       this._something = value;
   }
}
...

2. If you need to execute different operations for the properties – modify your code generation template to generate partial methods for each of the properties like below:

partial void BeforeIdGet();
partial void BeforeIdSet(int newValue); // optionally add argument for the old value

private int _id;
public virtual int Id
{
   get
   {
       this.BeforeIdGet();
       return this._id;
   }
   set
   {
       this.BeforeIdSet(value);
       this._id = value;
   }
}
... // the same for each property that you need

 After that add implementation for the partial method in your partial class:

public partial class YourClass
    {
        partial void BeforeIdGet()
        {
            ... // before getting the property
        }

        partial void BeforeIdSet(int newValue)
        {
            ... // before setting the property
        }
        ... // the same for each property that you need
    }

 Below you could find useful information about our code generation templates and how to use them.
• Telerik TV: Customizing Code Generation Templates in OpenAccess ORM
• Best Practices for Customizing the Code Generation Templates
• How to: Implement INotifyPropertyChanging/ed Interface (C#)
• How to: Implement INotifyPropertyChanging/ed Interface (VB.NET)

I hope this helps. I will be happy to assist you if you have further questions.

Regards,
Dimitar Tachev
the Telerik team