IDataStore<TModel>.IndexOf<TModel>(TModel item) Method

.NET Standard 2.x

Determines the index number of a specific model instance in the primary buffer of DataStore. This index is the same as the zero-based row number in the primary buffer.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

public int IndexOf<TModel>(TModel item);

Parameters

item TModel

The model object of a row to locate in the primary buffer.

The type of the model class must match with the current DataObject.

Returns

System.Int32

Returns the zero-based index of the model object in the primary buffer if found; otherwise, -1.

Examples

The following code example demonstrates how to get the index of a row item.

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

namespace Appeon.ApiDoc.IDataStore_GenericExamples
{
    public class IndexOfExample
    {
        private readonly SchoolContext _context;

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

        public void Example()
        {
            // Instantiates a DataStore object with datawindow: d_department.
            var datastore = new DataStore<D_Department>(_context);

            datastore.Retrieve();

            // Gets the department object of the first row
            var department = datastore.GetForUpdate(0);

            // Gets the row number of department object in the datastore
            // It is the first row in datastore, so 0 should be returned
            int row = datastore.IndexOf(department);

            Console.WriteLine("Row: {0}", row);

            // Sorts datastore by departmentid desc.
            // The record in the first row is moved to the fourth row.
            datastore.Sort(a=> a.Departmentid,true);

            row = datastore.IndexOf(department);

            Console.WriteLine("Row: {0}", row);

            /*This code produces the following output:

            Row: 0
            Row: 3
           */
        }
    }
}

Example Refer To

Model Class: D_Department
DataWindow File: d_department