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SaveFileDialog: questions to answer
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Where are photo albums stored Even though you may allow the user to select any location on disk, it is a good idea to encourage a standard location for the files in your application. In our case, this location is specified by the static DefaultDir property in the PhotoAlbum class. What is the file extension The selection of extension is a bit subjective. On Windows platforms, the following conventions normally apply: Use three-letter extensions. The one exception is .html files for HTML files, but even here the .htm extension is preferred. Keep the first letter. Typically, the first letter of the type of file should be the first letter of your extension. In our case, the extension for album file should begin with the letter a .
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At a minimum, start the extension with a letter. Use a number only if it is a critical aspect the type file you are creating. Avoid well-known extensions. You will avoid confusion by using a somewhat unique combination of letters. You would not want to use extensions such as .txt (already used for Text files) or .jpg (for JPEG files). To see the list of file types currently registered on your computer, open Windows Explorer and select the Folder Options item under the Tools menu. Click on the File Types tab to see the extensions currently in use. Use an acronym. It helps if your extension has some meaning to your users. If it makes sense, use an acronym of the full name. For example, the .gif extension is used for Graphics Interchange Format files. Leave out the vowels. Another common tactic is to leave out any vowels in the name. Examples of this include the .txt (Text) and .jpg (JPEG) extensions.
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Avoid numbers.
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Based on these conventions, we could use alb or abm here, which both derive from Album without the vowel u ). We will use the extension .abm. What is the right title bar text Don t forget to set a custom title bar that makes sense for your dialog. The default title bar is Save, which is not very descriptive. We will use Save Album for our title. How should existing or nonexistent files be handled By default, the user will be prompted if they select a file that already exists (the OverwritePrompt property) and will not be told if the file is new (the CreatePrompt property). Often the default behavior is fine, but it is worth making a conscious decision for your application. We will (consciously!) use the defaults in our code. Now that we understand the right behavior to provide, we can implement the Save As menu handler.
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Set the version number of the MyPhotos application to 6.6. IMPLEMENT HANDLER FOR SAVE AS MENU Action 1 Add a Click handler to the Save As menu. Create a SaveFileDialog instance and initialize the properties as discussed. Note: In the Filter property setting, we permit all files to be shown, even though only the abm extension is a recognized album file. This is not necessary, but a nice convenience to allow the user to see all files in a directory. 3 Once a user selects a file, record the album name and save the current album using this name. Result
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protected void menuSaveAs_Click (object sender, System.EventArgs e) { SaveFileDialog dlg = new SaveFileDialog(); dlg.Title = "Save Album"; dlg.DefaultExt = "abm"; dlg.Filter = "Album files (*.abm)|*.abm|" + "All files|*.*"; dlg.InitialDirectory = PhotoAlbum.DefaultDir; dlg.RestoreDirectory = true;
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if (dlg.ShowDialog() == DialogResult.OK) { // Record the new album name _album.FileName = dlg.FileName; // Use Save handler to store the album menuSave_Click(sender, e); // Update title bar to include new name SetTitleBar(); }
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