IModelEntry Interface

.NET Standard 2.x

Represents an object that contains the data of a model object and the state of the data.

It provides methods, properties, and events for accessing and manipulating the data and state.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

   public interface IModelEntry;

Event

Name	Description
CurrentValueChanged	Occurs when the current value is changed.

Property

Name	Returns Type	Description
ModelState	ModelState	Gets the tracked state of the data.
Properties	int	Gets the property names of the model class.

Method

Name	Returns Type	Description
GetPropertyState(string name)	PropertyState	Gets the tracked state of the specified property.
GetOriginalValue(string name)	object	Gets the original value of the specified property.
GetCurrentValue(string name)	object	Gets the current value of the specified property.
SetCurrentValue(string name, object value)	void	Sets the current value for the specified property.

Examples

The following code example demonstrates how to use IModelEntry to get and set details for a student record which contains data and state.

using Appeon.ApiDoc.Models.School;
using SnapObjects.Data;
using System;

namespace Appeon.ApiDoc.IModelEntryExamples
{
    public class IModelEntryExample
    {
        private SchoolContext _context;

        public IModelEntryExample(SchoolContext dataContext)
        {
            // Sets the data context.
            _context = dataContext;
        }

        public void Example(IModelEntry<Person> student)
        {
            // Gets the model state.
            Console.WriteLine("Model State: {0}",
                 student.ModelState.ToString());

            // Gets the properties.
            Console.WriteLine("Properties:");
            foreach (var propertyName in student.Properties)
            {
                Console.WriteLine(propertyName);
            }

            // Gets the property state of Enrollment Date.
            Console.WriteLine("Enrollment Date State: {0}",
                student.GetPropertyState("EnrollmentDate").ToString());

            // Gets the current value of Enrollment Date.
            Console.WriteLine("Current Enrollment Date: {0}",
                 student.GetCurrentValue("EnrollmentDate"));

            // Gets the original value of Enrollment Date.
            Console.WriteLine("Original Enrollment Date: {0}",
                 student.GetOriginalValue("EnrollmentDate"));

            student.CurrentValueChanged += ShowValueChanges;

            // Sets Enrollment Date with a new value.
            student.SetCurrentValue("Enrollment Date", new DateTime(2019, 1, 3));

            /* The code produces the following output:
            
            Model State: Modified
            Properties:
            PersonID
            LastName
            FirstName
            HireDate
            EnrollmentDate
            Discriminator
            Enrollment Date State: Modified
            Current Enrollment Date: 1/2/2019 12:00:00 AM
            Original Enrollment Date: 1/1/2019 12:00:00 AM
            EnrollmentDate Changed to 1/3/2019 12:00:00 AM
            */
        }

        private void ShowValueChanges(string name, object value)
        {
            Console.WriteLine("{0} changed to {1}",
                name, value);
        }
    }
}

Example Refer To

Model Class: Student