'File' does not contain a definition for 'WriteAllText'

Good day!

Task: Upon changing the Type field in the account card, export all records from the section  to a CSV file on the user's computer.

You encountered an error message: 'File' does not contain a definition for 'WriteAllText'. However, you have included the using System.IO; directive.



Code:

 

  namespace Terrasoft.Configuration

{

    using Common;

    using System;

    using System.Linq;

    using Terrasoft.Core;

    using Terrasoft.Core.Entities;

    using Terrasoft.Core.Entities.Events;

    using Terrasoft.Core.Factories;

    using Newtonsoft.Json;

    using System.IO;

    #region Class: CHAccount_Custom_1EventListener

    [EntityEventListener(SchemaName = "Account")]

    public class CHAccount_Custom_1EventListener : BaseEntityEventListener

    {

        Entity _entity;

        UserConnection _userConnection;

        public UserConnection UserConnection => _userConnection ?? (_userConnection = _entity?.UserConnection);

        #region Methods: Public

        public override void OnSaved(object sender, EntityAfterEventArgs e)

        {

            base.OnSaved(sender, e);

            _entity = (Entity)sender;

            _userConnection = _entity.UserConnection;

            var typeId = _entity.GetTypedColumnValue("TypeId");

            // Check if the saving event occurred for the Account object.

            if (typeId == new Guid ("f2c0ce97-53e6-df11-971b-001d60e938c6"))

            {

                // Retrieve data of the accounts from the Account object.

                EntitySchemaQuery esq = new EntitySchemaQuery(_entity.Schema);

                esq.AddColumn("Name");

                esq.AddColumn("CreatedOn");

                EntityCollection collection = esq.GetEntityCollection(UserConnection);

                if (collection != null && collection.Count > 0)

                {

                    // Create a CSV file.

                    string csvContent = "Name,Date\n";

                    foreach (Entity entity in collection)

                    {

                        string name = entity.GetTypedColumnValue("Name");

                        DateTime date = entity.GetTypedColumnValue("CreatedOn");

                        csvContent += $"{name},{date.ToString("yyyy-MM-dd")}\n";

                    }

                    // Save the CSV file to the C drive of the user's computer.

                    string filePath = @"C:\Accounts.csv";

                    File.WriteAllText(filePath, csvContent);

                }

            }

        }

        #endregion

    }

    #endregion

}