IDataStore.FindIndex<TModel>(Predicate<TModel> predicate, DwBuffer bufferType = DwBuffer.Primary) Method

.NET Standard 2.x

Generic method. Returns the index of the next row in the DataStore in which data meets the criteria defined by the predicate. The primary buffer is specified by default.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

int FindIndex<TModel>(Predicate<TModel> predicate, DwBuffer bufferType = DwBuffer.Primary);

Type Parameters

TModel

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

Parameters

predicate System.Predicate<TModel>

A Predicate<TModel> that you want to use as the search criteria.

bufferType DWNet.Data.DwBuffer

The buffer in which to find the row.

It is specified to the primary buffer by default.

Returns

System.Int32

Returns the zero-based index number of the row found.

Returns -1 if no row is found.

Examples

The following code example demonstrates how to return the index number of the department record by a Predicate<TModel> object.

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

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

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

        public void Example4()
        {
            // 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 found: 
            // departmentid=1, name=Engineering
            var findrow = datastore.FindIndex<D_Department>
                                (d => d.Departmentid < 3, DwBuffer.Primary);

            Console.WriteLine("Department ID: {0}; Department Name: {1}",
                               datastore.GetItem<int>(findrow, "departmentid"),
                               datastore.GetItem<string>(findrow, "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