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.NET Table 6.5 SaveFileDialog class
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The SaveFileDialog class represents a common file dialog box for saving a file to disk, and is part of the System.Windows.Forms namespace. This class inherits from the FileDialog class. See the FileDialog class description in .NET Table 1.2 on page 24 for a list of inherited members. CreatePrompt Gets or sets whether the dialog should prompt the user for permission to create a specified file that does not exist. The default is false (do not prompt). Gets or sets whether the dialog should prompt the user for permission to overwrite a specified file that already exists. The default is true (always prompt). Returns a Stream object with read/write permission of the file selected by the user.
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Public Properties OverwritePrompt
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Public Methods
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To save an album to disk, we need to implement two types of methods. The first is a Click event handler for both the Save and Save As menus. These handlers will use the SaveFileDialog class to allow a file to be selected. Second is a PhotoAlbum.Save method to write the album information into the selected file. Separating the user interface portion, in this case the file selection, from the data manipulation portion, here the actual file writes, is a common design technique that allows us to change either aspect of the task without overly affecting the other. As we shall see in future chapters, changes to how the data is stored by the PhotoAlbum.Save method will not affect the menu handlers implemented here. 6.6.1 WRITING ALBUM DATA The Click handlers for our Save and Save As menus will rely on a Save method in the PhotoAlbum class to actually save the data, so let s implement this first. This method will accept the name of a file in which to store the data. We rely on the user interface in MainForm to provide a file name approved by the user, so if the file already exists we will simply overwrite it.
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COMMON FILE DIALOGS
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Set the version number of the MyPhotoAlbum library to 6.6. ADD PHOTOALBUM.SAVE METHOD Action 1 2 Display the PhotoAlbum.cs file. At the end of the file, add the new Save method.
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public void Save(string fileName) { }
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Result
Note: This method is void since an error is not expected. If something goes wrong, an Exception will be thrown.
The format to use when creating such a file is always a question. One possibility would be to write an XML file to hold this album information. This is a good idea, but beyond the scope of this chapter, so we will stick with a simple text format. Since the file format will likely change, especially in this book, we will allow for possible future changes. With these issues in mind, we will store each photograph in the album on a separate line, with a version number at the beginning of the file. This section will use 66 as the version number, since we are in section 6.6 of the book. The resulting file looks like this:
66 <path to photograph 0> <path to photograph 1> <path to photograph 2> . . .
Our version number is likely to change in future chapters, so we will provide a constant to hold the current version.
ADD A CURRENT VERSION CONSTANT Action 3 Add a static constant integer called
_CurrentVersion to hold the version
Result
private const int _CurrentVersion = 66;
number.
The Save method will store the version number followed by the file name of each Photograph written as a simple string.
SAVE FILE DIALOGS
IMPLEMENT PHOTOALBUM.SAVE METHOD Action 4 Implement the Save method to store the album in the given file using the agreed-upon format. Result
public void Save(string fileName) { FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite); StreamWriter sw = new StreamWriter(fs); try { sw.WriteLine(_CurrentVersion.ToString()); // Store each file on a separate line. foreach (Photograph photo in this) { sw.WriteLine(photo.FileName); } } finally { sw.Close(); fs.Close(); } }
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