IDataIncludeGetter.FirstOrDefault() Method

.NET Standard 2.x

Creates a TModel object which contains the first row of data from the IDataUnpacker object. Returns null if there is no data.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

TModel FirstOrDefault();

Returns

TModel

A TModel object containing the data from the IDataUnpacker object. Returns null if there is no data.

Examples

The following code example gets the value of the Title property of the first record in the model object.

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

namespace Appeon.ApiDoc.IDataIncludeGetterExamples
{
    public class FirstOrDefaultExample
    {
        private readonly SchoolContext _context;

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

        public void Example()
        {
            var packer = new DataPacker();

            var mapper = new SqlModelMapper(_context);

            var items = mapper.Load<CourseInfo>(2).IncludeAll().ToList();

            // Adds the items object to the packer object
            string key = "Models";
            packer.AddModels(key, items);

            var json = packer.GetTextString(DataFormat.Json);

            var dataUnPacker = new DataUnpacker(json, DataFormat.Json);

            // Gets the model object list from dataUnPacker according to the key.
            var models = dataUnPacker.GetModels<CourseInfo>(key);

            // Gets the first record of models
            var model1 = models.FirstOrDefault();

            // Gets and shows the Title value of the first record of models
            Console.WriteLine("The title name of the first record is: {0}",
                model1.Title);

            /* This code example produces the following output:
            
            The title name of the first record is: Composition
            */
        }
    }
}

Example Refer To

Model Class: CourseInfo

Applies to

.NET Standard

2.x