B4: Command-Line Attributes in Visual C#

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// Since each element in the pair is a tree, // traverse the tree and yield each // element foreach (T item in tree) { yield return item; } } } } #endregion IEnumerable<T>
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#region IEnumerable Members IEnumerator IEnumerableGetEnumerator() { return GetEnumerator(); } #endregion }
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Listing B4: Command-Line Attributes
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using System; using SystemDiagnostics; public partial class Program { public static void Main(string[] args) { string errorMessage; CommandLineInfo commandLine = new CommandLineInfo(); if (!CommandLineHandlerTryParse( args, commandLine, out errorMessage)) { ConsoleWriteLine(errorMessage); DisplayHelp(); } if (commandLineHelp) { DisplayHelp(); } else { if (commandLinePriority !=
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Appendix B: Full Source Code Listings
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ProcessPriorityClassNormal) { // Change thread priority } } // } private static void DisplayHelp() { // Display the command-line help ConsoleWriteLine( "Thankyou for contacting the help text"); }
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using System; using SystemDiagnostics; public partial class Program { private class CommandLineInfo { [CommandLineSwitchAlias(" ")] public bool Help { get { return _Help; } set { _Help = value; } } private bool _Help; [CommandLineSwitchRequired] [CommandLineSwitchAlias("FileName")] public string Out { get { return _Out; } set { _Out = value; } } private string _Out; public ProcessPriorityClass Priority { get { return _Priority; } set { _Priority = value; } } private ProcessPriorityClass _Priority = ProcessPriorityClassNormal; } }
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using System; using SystemDiagnostics; using SystemReflection; public class CommandLineHandler { public static void Parse(string[] args, object commandLine) { string errorMessage; if (!TryParse(args, commandLine, out errorMessage)) { throw new ApplicationException(errorMessage); } } public static bool TryParse(string[] args, object commandLine, out string errorMessage) { bool success = false; errorMessage = null; foreach (string arg in args) { string option; if (arg[0] == '/' || arg[0] == '-') { string[] optionParts = argSplit( new char[] { ':' }, 2); // Remove the slash|dash option = optionParts[0]Remove(0, 1); PropertyInfo property = commandLineGetType()GetProperty(option, BindingFlagsIgnoreCase | BindingFlagsInstance | BindingFlagsPublic); if (property != null) { if (propertyPropertyType == typeof(bool)) { // Last parameters for handling indexers propertySetValue( commandLine, true, null); success = true; } else if ( propertyPropertyType == typeof(string)) { propertySetValue( commandLine, optionParts[1], null); success = true;
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Appendix B: Full Source Code Listings
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} else if (propertyPropertyTypeIsEnum) { try { propertySetValue(commandLine, EnumParse( typeof(ProcessPriorityClass), optionParts[1], true), null); success = true; } catch (ArgumentException ) { success = false; errorMessage = stringFormat( "The option '{0}' is " + "invalid for '{1}'", optionParts[1], option); } } else { success = false; errorMessage = stringFormat( "Data type '{0}' on {1} is not" + " supported", propertyPropertyTypeToString(), commandLineGetType()ToString()); } } else { success = false; errorMessage = stringFormat( "Option '{0}' is not supported", option); } } } return success; } }
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using System; using SystemCollectionsSpecialized; using SystemReflection;
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[AttributeUsage(AttributeTargetsProperty, AllowMultiple = false)] public class CommandLineSwitchRequiredAttribute : Attribute { public static string[] GetMissingRequiredOptions( object commandLine) { StringCollection missingOptions = new StringCollection(); PropertyInfo[] properties = commandLineGetType()GetProperties(); foreach (PropertyInfo property in properties) { Attribute[] attributes = (Attribute[])propertyGetCustomAttributes( typeof(CommandLineSwitchRequiredAttribute), false); if ((attributesLength > 0) && (propertyGetValue(commandLine, null) == null)) { if (propertyGetValue(commandLine, null) == null) { missingOptionsAdd(propertyName); } } } string[] results = new string[missingOptionsCount]; missingOptionsCopyTo(results, 0); return results; } }
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using System; using SystemReflection; using SystemCollectionsGeneric; [AttributeUsage(AttributeTargetsProperty)] public class CommandLineSwitchAliasAttribute : Attribute { public CommandLineSwitchAliasAttribute(string alias) { Alias = alias; } public string Alias { get { return _Alias; } set { _Alias = value; } } private string _Alias;
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Appendix B: Full Source Code Listings
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public static Dictionary<string, PropertyInfo> GetSwitches( object commandLine) { PropertyInfo[] properties = null; Dictionary<string, PropertyInfo> options = new Dictionary<string, PropertyInfo>(); properties = commandLineGetType()GetProperties( BindingFlagsPublic | BindingFlagsNonPublic | BindingFlagsInstance); foreach (PropertyInfo property in properties) { optionsAdd(propertyNameToLower(), property); foreach (CommandLineSwitchAliasAttribute attribute in propertyGetCustomAttributes( typeof(CommandLineSwitchAliasAttribute), false)) { optionsAdd(attributeAliasToLower(), property); } } return options; } }
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using System; using SystemReflection; using SystemCollectionsGeneric; public class CommandLineHandler { // public static bool TryParse( string[] args, object commandLine, out string errorMessage) { bool success = false; errorMessage = null; Dictionary<string, PropertyInfo> options = CommandLineSwitchAliasAttributeGetSwitches( commandLine); foreach (string arg in args) { PropertyInfo property; string option; if (arg[0] == '/' || arg[0] == '-') { string[] optionParts = argSplit(
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