Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / System / Configuration / AppSettingsReader.cs / 1305376 / 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; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ResourcesChangeInfo.cs
- BoundField.cs
- ClosableStream.cs
- ProtectedProviderSettings.cs
- Stream.cs
- ModelFactory.cs
- XPathExpr.cs
- PolicyStatement.cs
- AffineTransform3D.cs
- metadatamappinghashervisitor.cs
- ObjectPersistData.cs
- SortableBindingList.cs
- SourceItem.cs
- SerializerWriterEventHandlers.cs
- TrackingServices.cs
- ToolStripLabel.cs
- DivideByZeroException.cs
- WindowsFormsSynchronizationContext.cs
- Variant.cs
- DelegateSerializationHolder.cs
- IPEndPoint.cs
- GridViewDeleteEventArgs.cs
- OpenFileDialog.cs
- ExecutorLocksHeldException.cs
- TextBox.cs
- ListViewItemMouseHoverEvent.cs
- ApplicationDirectoryMembershipCondition.cs
- TextAction.cs
- FullTextLine.cs
- SQLDouble.cs
- Deflater.cs
- DeadCharTextComposition.cs
- ProviderConnectionPointCollection.cs
- CellCreator.cs
- HtmlTable.cs
- XmlFormatExtensionAttribute.cs
- CodeParameterDeclarationExpressionCollection.cs
- WebPartHeaderCloseVerb.cs
- WebPartManager.cs
- TypeConverter.cs
- RSAPKCS1KeyExchangeFormatter.cs
- MemoryFailPoint.cs
- ServiceDescriptionImporter.cs
- CustomExpressionEventArgs.cs
- MonthCalendarDesigner.cs
- PreparingEnlistment.cs
- WindowsNonControl.cs
- SqlTypeConverter.cs
- StringExpressionSet.cs
- WebPartConnectionsDisconnectVerb.cs
- SystemIPInterfaceStatistics.cs
- ResXResourceSet.cs
- DateTimeParse.cs
- PageCodeDomTreeGenerator.cs
- DebugHandleTracker.cs
- DataServiceProcessingPipeline.cs
- ListControl.cs
- GCHandleCookieTable.cs
- QueryServiceConfigHandle.cs
- UpDownEvent.cs
- HttpWebRequestElement.cs
- RoleGroupCollection.cs
- SettingsAttributeDictionary.cs
- RealizationContext.cs
- DiffuseMaterial.cs
- MatrixConverter.cs
- Marshal.cs
- BitmapImage.cs
- ErrorRuntimeConfig.cs
- Html32TextWriter.cs
- ValidationHelper.cs
- WindowsHyperlink.cs
- ItemsControlAutomationPeer.cs
- GridItemCollection.cs
- Point4D.cs
- ValidatorCollection.cs
- DataGridItemCollection.cs
- ViewManagerAttribute.cs
- BooleanProjectedSlot.cs
- StateManagedCollection.cs
- Underline.cs
- SqlDataSourceEnumerator.cs
- MediaScriptCommandRoutedEventArgs.cs
- FileLogRecord.cs
- WindowsFormsSynchronizationContext.cs
- HyperlinkAutomationPeer.cs
- XmlDataSourceDesigner.cs
- DataGridViewImageColumn.cs
- ComponentDispatcherThread.cs
- Tokenizer.cs
- Point4DValueSerializer.cs
- BodyWriter.cs
- PingOptions.cs
- DateTimeFormatInfoScanner.cs
- InteropAutomationProvider.cs
- LocalizationParserHooks.cs
- DesignerTransactionCloseEvent.cs
- CompletionCallbackWrapper.cs
- StringReader.cs
- TraceListener.cs