IDataStore<TModel>.Find(Predicate<TModel> predicate, bool calcCompute, DwBuffer bufferType = DwBuffer.Primary) Method

.NET Standard 2.x

Finds the next row in the specified buffer of the DataStore in which data meets the condition specified by the expression.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

TModel Find(Predicate<TModel> predicate, bool calcCompute, DwBuffer bufferType = DwBuffer.Primary);

Parameters

predicate Predicate<TModel>

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

calcCompute System.Boolean

Whether to calculate columns with DwCompute attribute.

bufferType DWNet.Data.DwBuffer

The buffer in which to find row.

It is specified to the primary buffer by default.

Returns

TModel

Returns the TModel object which contains the data for the row found; and returns null if no row is found.

Examples

The following code example demonstrates how to find the department record by a Predicate<TModel> object and using the calcCompute parameters.

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

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

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

        public void Example2()
        {
            // Instantiates a DataStore object with datawindow: d_person_with_dwcompute.
            var datastore = new DataStore<D_Person_With_Dwcompute>(_context);

            datastore.Retrieve();

            // The first record in the Department table is found: 
            // PersonID =1, FirstName=Kim, LastName=Abercrombie
            var person = datastore.Find(d => d.Personid < 3, true, DwBuffer.Primary);

            Console.WriteLine(
                "PersonID ID: {0}; FirstName: {1}; LastName: {2}; Compute_Fullname: {3};",
                person.Personid, person.Firstname, person.Lastname, person.Compute_Fullname);

            /*This code produces the following output:
             
            PersonID ID: 1; FirstName: Kim; LastName: Abercrombie; Compute_Fullname: Kim Abercrombie;
            */
        }
    }
}

Example Refer To

Model Class: D_Person_With_Dwcompute
DataWindow File: d_person_with_dwcompute