BudgetAnalyser.Statement.LoadFileController.OnBrowseForFileCommandExecute C# (CSharp) Метод

        private void OnBrowseForFileCommandExecute()
        {
            if (this.showingDialog)
            {
                return;
            }

            try
            {
                this.showingDialog = true;
                var dialog = this.userPromptOpenFileFactory();
                dialog.DefaultExt = "*.CSV";
                dialog.Title = "Select a CSV file of transactions to load.";
                dialog.Filter = "Comma Separated Values (*.CSV)|*.CSV";
                bool? result = dialog.ShowDialog();
                if (result == null || result == false)
                {
                    FileName = null;
                    return;
                }

                if (!File.Exists(dialog.FileName))
                {
                    this.messageBox.Show("File not found.\n" + dialog.FileName, "Open file");
                    FileName = null;
                    return;
                }

                FileName = dialog.FileName;
            }
            finally
            {
                this.showingDialog = false;
            }
        }