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During its lifetime, an application runs in a certain environment The environment is provided by a combination of compile-time and run-time settings supplied by NET and Windows
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Compile-Time Settings
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The Application class exposes several properties that provide the company name, product name, and product version of the currently running application: void AboutBox_Load(object sender, EventArgs e) { thiscompanyNameTextBoxText = ApplicationCompanyName; thisproductNameTextBoxText = ApplicationProductName; thisproductVersionTextBoxText = ApplicationProductVersion; } By default, these three values come from assemblywide AssemblyCompanyAttribute, AssemblyProductAttribute, and AssemblyVersionAttribute (provided in a wizard-generated file called AssemblyInfocs): [assembly: AssemblyCompanyAttribute("Sells Brothers, Inc")] [assembly: AssemblyProductAttribute("Environment Test Application")] // Version info for an assembly consists of the following values: // majorminorbuildrevision // You can specify all the values, or you can default the Revision and // Build Numbers by using the '*' as shown below: [assembly: AssemblyVersionAttribute("10*")] Not only will the values you put into these attributes be available using the Application properties, but they'll also be bundled into the Win32 version information for the assembly, as shown by the Version property page in Explorer in Figure 115
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Figure 115 Assembly Properties Shown in the Shell
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The rest of the version information is set via other assembly-level attributes: [assembly: [assembly: [assembly: [assembly: [assembly: AssemblyTitle("Environment Test Title")] AssemblyDescription("Environment Test Description")] AssemblyCompany("Sells Brothers, Inc")] AssemblyProduct("Environment Test Application")] AssemblyCopyright("Copyright (c) 2003, Chris Sells")]
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[assembly: AssemblyTrademark("Trademark nobody")] [assembly: AssemblyVersion("10*")]
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If you'd like to know where your application was started from in the file system or which folder it was run from, you can get that information from the ExecutablePath and StartupPath properties of the Application object Table 111 shows examples of each If you want more environment settings, such as the environment variables or the command line string, you can get them from the Environment object in the System namespace: sealed class Environment { // Properties public static string CommandLine { get; } public static string CurrentDirectory { get; set; } public static int ExitCode { get; set; } public bool HasShutdownStarted { get; }
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public public public public public public public public public public public
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static static static static static static static static static static static
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string MachineName { get; } string NewLine { get; } OperatingSystem OSVersion { get; } string StackTrace { get; } string SystemDirectory { get; } int TickCount { get; } string UserDomainName { get; } bool UserInteractive { get; } string UserName { get; } Version Version { get; } long WorkingSet { get; } void Exit(int exitCode); string ExpandEnvironmentVariables(string name); string[] GetCommandLineArgs(); string GetEnvironmentVariable(string variable); IDictionary GetEnvironmentVariables(); string GetFolderPath(SpecialFolder folder); string[] GetLogicalDrives();
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// Methods public static public static public static public static public static public static public static }
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Table 111 The Application ExecutablePath and StartupPath Properties
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Application Class Static Property ExecutablePath StartupPath Sample Property Value D:\data\WinForms Book\src\ch11\Settings\bin\Debug\SettingsTestexe D:\data\WinForms Book\src\ch11\Settings\bin\Debug
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As shown earlier, the command line arguments are also available as the array of strings argument passed to Main: [STAThreadAttribute] static void Main(string[] args) { bool flag = false; string name = ""; int number = 0; // *Very* simple command line parsing for( int i = 0; i != argsLength; ++i ) { switch( args[i] ) { case "/flag": flag = true; break; case "/name": name = args[++i]; break; case "/number": number = intParse(args[++i]); break; default: MessageBoxShow("invalid args!"); return; } } MessageBoxShow(flagToString(), "flag"); MessageBoxShow(name, "name"); MessageBoxShow(numberToString(), "number"); }
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If you want to see more robust command line parsing support, see the Genghis class library available at http://wwwgenghisgroupcom [ Team LiB ]
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Settings
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Environment variables and command line arguments are both ways for the user to specify run-time settings to a particular application NET provides several more ways, including OS favorites like the Registry and special folders, as well as new ways like config files and isolated storage
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Types of Settings
When saving settings, you should consider several different localities of settings: Application These settings are shared among all users of an application on the machine For example, the list of directories in which to search for the assemblies to show in the Add Reference dialog is a per-application setting[6]