IOrderable<TModel>.ThenByDescending<TKey>(Func<TModel, TKey> keySelector) Method

.NET Standard 2.x

Performs a subsequent ordering of the model objects in the current sortable object in descending order according to a key.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

  IOrderable<TModel> ThenByDescending<TKey>(Func<TModel, TKey> keySelector);

Type Parameters

TKey

The data type of the key.

Parameters

keySelector System.Func<TModel, TKey>

A function to extract a key from a model object.

Returns

SnapObjects.Data.IOrderable<TModel>

Returns the current IOrderable object which can be used to add other sorting conditions or execute sort.

Examples

The following code example sets the primary and secondary sorting rules and then sorts the data according to the rule in the descending order.

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

namespace Appeon.ApiDoc.IOrderableExamples
{
    public class ThenByDescendingExample
    {
        private readonly SchoolContext _context;
        public ThenByDescendingExample(SchoolContext context)
        {
            _context = context;
        }

        public void Example()
        {
            // Retrieves data for ModelStore
            var courses = new ModelStore<Course>();
            courses.Retrieve(_context);

            // Sets the primary sorting rule (first by DepartmentID)
            var order = courses.OrderBy(m => m.DepartmentID);

            // Sets the secondary sorting rule (then by CourseID in descending order)
            var secondOrder = order.ThenByDescending(m => m.CourseID);

            // Sorts the data
            secondOrder.Sort();
        }
    }
}

Example Refer To

Model Class: Course

Applies to

.NET Standard

2.x