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ConfigurationSaveMode::Full: Causes all properties to be written to the .config file. This is useful for creating a copy of or moving configuration values from one machine to another. ConfigurationSaveMode::Minimal: Causes only configuration settings that differ from configuration-inherited values to be written to the .config file. ConfigurationSaveMode::Modified: Causes all modified configuration settings to be written to the .config file, even when the value is the same as the configuration-inherited value. The difference between Minimal and Modified may not be apparent until you factor in that .config files are in fact a hierarchy (as mentioned earlier). Thus, Modified will save configuration values even though due to configuration inheritance the value is already being set to that value. The last overload takes a ConfigurationSaveMode enum as a parameter but also an additional Boolean parameter that, when true, forces the save even if nothing was modified. This means you could use any of these to save your modifications: config->Save(); config->Save(ConfigurationSaveMode::Modified); config->Save(ConfigurationSaveMode::Modified, true); What happens if you want to save the .config file but not overwrite the original In this case you can use the overloaded SaveAs() methods on the Configuration class. The SaveAs() method is identical to the Save() method except it has an additional parameter with the path and filename of where you want to save the file to: config->Save(newConfigFilePathAndName); config->Save(newConfigFilePathAndName, ConfigurationSaveMode::Modified); config->Save(newConfigFilePathAndName, ConfigurationSaveMode::Modified, true); As I told you, you d already seen most of the code.

The Compare option allows you to view the differences between the local version and the server version or the original version of the file that was checked out. When you select OK, the Merge Tool shown in Figure 3-28 is displayed.

Things remain easy if you want to add and remove settings from the appSettings section. The reason is the Settings property (as shown earlier) of the KeyValueConfigurationCollection class. With it comes the standard collection methods of Add() and Delete().

filenameWithoutExtension, counter, extension]; filenameAlreadyInUse = [fm fileExistsAtPath:[dir stringByAppendingPathComponent:filename]]; } } NSError *error = nil; [fm copyItemAtPath:importFilePath toPath:[dir stringByAppendingPathComponent:filename] error:&error]; [allFiles addObject:filename]; [allFiles sortUsingSelector:@selector(compare:)]; self.currentFile = filename; [[NSNotificationCenter defaultCenter] postNotificationName:FileListChanged object:self]; }

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Caution I believe there is a bug in the KeyValueConfigurationCollection class s Clear() method (as of Visual Studio 2008 SP1): it does clear the collection, as expected, but then it sticks a <clear /> tag in the appSettings XML that should not be there.

Figure 3-28. Merge Tool window There are a number of important pieces of information available to you in this window. The first piece of information is in the title bar. Theirs (dbo.categories.sql;C24) indicates the file on the server that the local file is attempting to be merged with and the changeset that the file exists in. The two windows at the top of the dialog box are the two different versions of the file. The server version of the file is located on the left and the local version on the right. Changes are noted by the lines in colors (the legend is in the lower right of the window). In Figure 3-28, three lines were changed in the server version, two lines were changed on the local version, and one line was deleted from the local version. The lower window shows you what the final merged file will look like. So, what is the merge tool telling you First, looking at the bottom left of the window you can see that there are three changes in total, and one conflict. The blue arrow in the lower window is pointing at the first change in the file.

So, to add a new setting to appSettings you use the following code: appSettingsSection->Settings->Add("Key", "Value"); or the more long-winded appSettingsSection->Settings->Add( gcnew KeyValueConfigurationElement("Key", "Value")); To delete a setting from appSettings, use the following code: appSettingsSection->Settings->Remove("Key"); But don t forget to call the Configuration class s Save() or SaveAs() method after you are done or nothing will be saved to the .config file.

Team Foundation contains a brand-new version control tool, which is designed for large-scale teams and is backed by SQL Server 2005. For developers, it will be a welcome addition to their toolbox and offer an easy alternative to Visual SourceSafe. Also, unlike Visual SourceSafe, Team

One very cool feature of using the Configuration and AppSettingsSection classes as described earlier is that if there isn t an appSettings section in the .config file, it will automatically be added when the Save() method is called on the Configuration class. But even cooler than that, if there isn t a .config file, it too is automatically created.

This method basically just copies the file, but not before checking to make sure the filename isn't already taken. If the name exists, it will come up with a new filename by tacking on a number.

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