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; } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- _ListenerRequestStream.cs
- WorkflowInstanceProvider.cs
- DataSetMappper.cs
- ExpandedProjectionNode.cs
- AutomationElement.cs
- CompositeCollection.cs
- DataGridViewAddColumnDialog.cs
- ReliableChannelFactory.cs
- Parameter.cs
- InfiniteTimeSpanConverter.cs
- RequestTimeoutManager.cs
- RuntimeEnvironment.cs
- DataSourceProvider.cs
- BooleanConverter.cs
- StyleXamlTreeBuilder.cs
- NoneExcludedImageIndexConverter.cs
- PolyQuadraticBezierSegment.cs
- AddInAdapter.cs
- MsmqIntegrationInputMessage.cs
- SocketConnection.cs
- ChannelFactoryRefCache.cs
- TdsValueSetter.cs
- ObjRef.cs
- ProxySimple.cs
- _AutoWebProxyScriptEngine.cs
- entityreference_tresulttype.cs
- SHA1CryptoServiceProvider.cs
- SpeakProgressEventArgs.cs
- NegotiateStream.cs
- UnauthorizedWebPart.cs
- MDIWindowDialog.cs
- BaseParaClient.cs
- Token.cs
- TimeZone.cs
- InstanceHandleReference.cs
- XmlNode.cs
- SynchronizationContextHelper.cs
- AttachedPropertyBrowsableForTypeAttribute.cs
- SafeTimerHandle.cs
- DiagnosticsConfiguration.cs
- XamlRtfConverter.cs
- Decoder.cs
- VBCodeProvider.cs
- PlainXmlWriter.cs
- CqlBlock.cs
- FilteredDataSetHelper.cs
- GroupBoxDesigner.cs
- ListView.cs
- WebBrowser.cs
- ActivationWorker.cs
- TemplateBindingExpressionConverter.cs
- BufferedGraphicsContext.cs
- TypeConverters.cs
- Transform3DCollection.cs
- IHttpResponseInternal.cs
- PeerToPeerException.cs
- SqlCacheDependency.cs
- AnimationClockResource.cs
- TextTreeObjectNode.cs
- RuleSetCollection.cs
- ToolStripSeparatorRenderEventArgs.cs
- TransactionsSectionGroup.cs
- UnicastIPAddressInformationCollection.cs
- QilXmlWriter.cs
- SvcMapFileLoader.cs
- UpdateCommand.cs
- BindToObject.cs
- Visitors.cs
- XmlRootAttribute.cs
- WebDisplayNameAttribute.cs
- ButtonBaseAutomationPeer.cs
- XmlSubtreeReader.cs
- FixedSOMContainer.cs
- GridViewRowCollection.cs
- RectConverter.cs
- XmlUrlResolver.cs
- DataRelationCollection.cs
- WSSecurityTokenSerializer.cs
- TypefaceCollection.cs
- DbLambda.cs
- COM2ColorConverter.cs
- CodeObject.cs
- CodeSubDirectoriesCollection.cs
- DateTimeValueSerializerContext.cs
- UnsafeCollabNativeMethods.cs
- DocumentViewerHelper.cs
- DelegatingConfigHost.cs
- MessagePartSpecification.cs
- PointCollectionConverter.cs
- DependencyPropertyDescriptor.cs
- DbMetaDataFactory.cs
- TemplateKeyConverter.cs
- CollectionViewGroupRoot.cs
- ByteRangeDownloader.cs
- StorageMappingItemCollection.cs
- WindowsFormsLinkLabel.cs
- CqlQuery.cs
- SqlNotificationEventArgs.cs
- CmsInterop.cs
- CompressStream.cs