Catel - Part 4 of n: Unit testing with Catel

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="SaveFileService.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Service to save files.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System.Windows.Controls;

namespace Catel.MVVM.Services
{
	/// <summary>
	/// Service to save files.
	/// </summary>
	public class SaveFileService : ViewModelServiceBase, ISaveFileService
	{
		#region IFileSupport Members
		/// <summary>
		/// Gets or sets the name of the file.
		/// </summary>
		/// <value>The name of the file.</value>
		public string FileName { get; set; }

		/// <summary>
		/// Gets or sets the filter to use when opening or saving the file.
		/// </summary>
		/// <value>The filter.</value>
		public string Filter { get; set; }

		/// <summary>
		/// Gets or sets the initial directory.
		/// </summary>
		/// <value>The initial directory.</value>
		public string InitialDirectory { get; set; }

		/// <summary>
		/// Determines the filename of the file what will be used.
		/// </summary>
		/// <returns><c>true</c> if a file is selected; otherwise <c>false</c>.</returns>
		/// <remarks>
		/// If this method returns <c>true</c>, the <see cref="FileName"/> property will be filled with the filename. Otherwise,
		/// no changes will occur to the data of this object.
		/// </remarks>
		public bool DetermineFile()
		{
			// Declare open file
			var fileDialog = new SaveFileDialog();
			fileDialog.Filter = Filter;

			// Show dialog
			bool result = fileDialog.ShowDialog() ?? false;

			// Store values if succeeded
			if (result)
			{
				FileName = fileDialog.SafeFileName;
			}

			// Return result
			return result;
		}
		#endregion
	}
}