Initialize Entity Properties

Feb 20, 2023
2 minutes to read

This lesson explains how to initialize properties in the newly created entity instances.

The steps below show how to add a Priority property to the DemoTask class and how to initialize the property value. For DemoTask class implementation code, see the following lesson: Set a Many-to-Many Relationship.

Note

Before you proceed, take a moment to review the previous lessons:

Step-by-Step Instructions

Add the Priority property to the DemoTask class and declare the Priority enumeration:

namespace MySolution.Module.BusinessObjects {
    //...
    public class DemoTask : BaseObject {
        //...
        public virtual Priority Priority { get; set; }
    }

    public enum Priority {
        Low = 0,
        Normal = 1,
        High = 2
    }
}

Use the code below to initialize the newly added Priority property when you create a DemoTask object:

public class DemoTask : BaseObject {
    //..
    public override void OnCreated() {
        Priority = Priority.Normal;
    }
    //...
}

Add a migration and update the database. See the following section for details: Use a DBMS: Setup Migrations.
Run the application.

Create a new Task object. In the Task detail view, the Priority field value is Normal, as you declared in the code above.

ASP.NET Core Blazor

Windows Forms

Note that XAF generates a combo box for the Priority property. The combo box items are the enumeration values you declared in step 1.

ASP.NET Core Blazor

Windows Forms