IDataStore<TModel>.GetChild<TChildModel>(Expression<Func<TModel, object>> columnSelector, out IDataStore<TChildModel> child) Method

.NET Standard 2.x

Provides a reference to the DataWindowChild, which you can use to manipulate that DataStore.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

bool GetChild<TChildModel>(Expression<Func<TModel, object>> columnSelector, out IDataStore<TChildModel> child);

Parameters

columnSelector Func<TModel, TValue>

A transform function to apply to each column.

child IDataStore<TChildModel>

The reference to the DataWindowChild.

Returns

System.Boolean

Returns true if it succeeds.

Examples

The following code example demonstrates how to get the DataWindowChild by Predicate object.

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

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

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

        public void Example4()
        {
            // Instantiates a DataStore object with datawindow: d_course.
            var datastore = new DataStore<D_Course>(_context);

            datastore.Retrieve();

            // The departmentid column has a DropDownDataWindow: dddw_deparment.
            bool result = datastore.GetChild(a => a.Departmentid, out IDataStore<Dddw_Department> department);

            Console.WriteLine("Result:{0}", result);

            Console.WriteLine("DataWindowChild rowcount: {0}",
                department.RowCount);

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

            /*This code produces the following output:
             
            Result: True
            DataWindowChild rowcount: 4
            Department ID: 2; Department Name: English
            */
        }
    }
}

Example Refer To

Model Classes: D_Course Dddw_Department
DataWindow File: d_course