Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Configuration / AppSettingsReader.cs / 1 / AppSettingsReader.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System; using System.Reflection; using System.Configuration; using System.Collections.Specialized; using System.Globalization; namespace System.Configuration { ////// The AppSettingsReader class provides a wrapper for System.Configuration.ConfigurationManager.AppSettings /// which provides a single method for reading values from the config file of a particular type. /// public class AppSettingsReader { private NameValueCollection map; static Type stringType = typeof(string); static Type[] paramsArray = new Type[] { stringType }; static string NullString = "None"; ////// Constructor /// public AppSettingsReader() { map = System.Configuration.ConfigurationManager.AppSettings; } ////// Gets the value for specified key from ConfigurationManager.AppSettings, and returns /// an object of the specified type containing the value from the config file. If the key /// isn't in the config file, or if it is not a valid value for the given type, it will /// throw an exception with a descriptive message so the user can make the appropriate /// change /// public object GetValue(string key, Type type) { if (key == null) throw new ArgumentNullException("key"); if (type == null) throw new ArgumentNullException("type"); string val = map[key]; if (val == null) throw new InvalidOperationException(SR.GetString(SR.AppSettingsReaderNoKey, key)); if (type == stringType) { // It's a string, so we can ALMOST just return the value. The only // tricky point is that if it's the string "(None)", then we want to // return null. And of course we need a way to represent the string // (None), so we use ((None)), and so on... so it's a little complicated. int NoneNesting = GetNoneNesting(val); if (NoneNesting == 0) { // val is not of the form ((..((None))..)) return val; } else if (NoneNesting == 1) { // val is (None) return null; } else { // val is of the form ((..((None))..)) return val.Substring(1, val.Length - 2); } } else { try { return Convert.ChangeType(val, type, CultureInfo.InvariantCulture); } catch (Exception) { string displayString = (val.Length == 0) ? SR.AppSettingsReaderEmptyString : val; throw new InvalidOperationException(SR.GetString(SR.AppSettingsReaderCantParse, displayString, key, type.ToString())); } } } private int GetNoneNesting(string val) { int count = 0; int len = val.Length; if (len > 1) { while (val[count] == '(' && val[len - count - 1] == ')') { count++; } if (count > 0 && string.Compare(NullString, 0, val, count, len - 2 * count, StringComparison.Ordinal) != 0) { // the stuff between the parens is not "None" count = 0; } } return count; } } }
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