IDataStore.FirstOrDefault<TModel>() Method

.NET Standard 2.x

Generic method. Returns the first data row of the DataStore. If no data row is found, returns null.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

  public TModel FirstOrDefault<TModel>();

Type Parameters

TModel

The type of a model class that matches with the current DataObject.

Returns

TModel

Returns the TModel object which contains the data for the first row.

Returns null if no row is found.

Examples

The following code example demonstrates how to use the FirstOrDefault method to get the first record in DataStore.

using Appeon.ApiDoc.Models;
using DWNet.Data;
using System;

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

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

        public void Example1()
        {
            // Instantiates a DataStore object with datawindow: d_department.
            var datastore = new DataStore("d_department", _context);

            datastore.Retrieve();

            // The first record in the Department table is: 
            // departmentid=1, name=Engineering
            var department = datastore.FirstOrDefault<D_Department>();

            Console.WriteLine("Department ID: {0}; Department Name: {1}",
                               department.Departmentid,
                               department.Name);

            /*This code produces the following output:
             
            Department ID: 1; Department Name: Engineering
            */

        }
    }
}

Example Refer To

Model Class: D_Department
DataWindow File: d_department

Applies to

.NET Standard

2.x