IDataStore.GetForUpdate<TModel>(Predicate<TModel> predicate) Method

.NET Standard 2.x

Obtains a TModel object for update according to the specified condition.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

 public TModel GetForUpdate<TModel>(Predicate<TModel> predicate);

Parameters

predicate System.Predicate<TModel>

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

Returns

System.Int32

Returns the TModel object which contains the data for the row found.

It returns null if no row is found.

Remarks

This method makes a shallow copy of the data, therefore, any changes made to this TModel will affect the data source. To make a deep copy of the data, refer to GetModel. If multiple rows satisfy the condition, the first row will be returned.

The index number starts from 0, which is consistent with C#.

Examples

The following code example demonstrates how to get data from a Predicate<TModel> object.

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

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

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

        public void Example2()
        {
            // Instantiates a DataStore object with datawindow: d_department.
            var datastore = new DataStore("d_department", _context);

            datastore.Retrieve();
			
			//Gets the data for update according to the condition (DepartmentID = 1).
            var department = datastore.GetForUpdate<D_Department>(a => a.Departmentid == 1);

            Console.WriteLine("Department ID: {0},Department Name: {1}",
                department.Departmentid, department.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