Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / TrackingValidationObjectDictionary.cs / 1305376 / TrackingValidationObjectDictionary.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net { using System; using System.Collections; using System.Collections.Specialized; using System.Collections.Generic; using System.Diagnostics; // TrackingValidationObjectDictionary uses an internal collection of objects to store // only those objects which are not strings. It still places a copy of the string // value of these objects into the base StringDictionary so that the public methods // of StringDictionary still function correctly. // NOTE: all keys are converted to lowercase prior to adding to ensure consistency of // values between keys in the StringDictionary and internalObjects because StringDictionary // automatically does this internally internal class TrackingValidationObjectDictionary : StringDictionary { #region Private Fields // even though validators may exist, we should not initialize this initially since by default it is empty // and it may never be populated with values if the user does not set them private IDictionaryinternalObjects = null; private readonly IDictionary validators; #endregion #region Constructors // it is valid for validators to be null. this means that no validation should be performed internal TrackingValidationObjectDictionary(IDictionary validators) { IsChanged = false; this.validators = validators; } #endregion #region Private Methods // precondition: key must not be null // addValue determines if we are doing a set (false) or an add (true) private void PersistValue(string key, string value, bool addValue) { Debug.Assert(key != null, "key was null"); // StringDictionary will automatically store the key as lower case so // we must convert it so that the validators and internalObjects will // be consistent key = key.ToLowerInvariant(); // StringDictionary allows keys with null values however null values for parameters in // ContentDisposition have no meaning so they must be ignored on add. StringDictionary // would not throw on null so this can't either since it would be a breaking change. // in addition, a key with an empty value is not valid so we do not persist those either if (!string.IsNullOrEmpty(value)) { if (validators != null && validators.ContainsKey(key)) { // run the validator for this key; it will throw if the value is invalid object valueToAdd = validators[key](value); // now that the value is valid, ensure that internalObjects exists since we have to // add to it if (internalObjects == null) { internalObjects = new Dictionary (); } if (addValue) { // set will do an Add if the key does not exist but if the user // specifically called Add then we must let it throw internalObjects.Add(key, valueToAdd); base.Add(key, valueToAdd.ToString()); } else { internalObjects[key] = valueToAdd; base[key] = valueToAdd.ToString(); } } else { if (addValue) { base.Add(key, value); } else { base[key] = value; } } IsChanged = true; } } #endregion #region Internal Fields // set to true if any values have been changed by any mutator method internal bool IsChanged { get; set; } // delegate to perform validation and conversion if necessary // these MUST throw on invalid values. Additionally, each validator // may be passed a string OR another type of object and so should react // appropriately internal delegate object ValidateAndParseValue(object valueToValidate); #endregion #region Internal Methods // public interface only allows strings so this provides a means // to get the objects when they are not strings internal object InternalGet(string key) { // internalObjects will throw if the key is not found so we must check it if (internalObjects != null && internalObjects.ContainsKey(key)) { return internalObjects[key]; } else { // this will return null if the key does not exist so no check needed return base[key]; } } // this method bypasses validation // preconditions: value MUST have been validated and must not be null internal void InternalSet(string key, object value) { // InternalSet is only used with objects that belong in internalObjects so we must always // initialize it here if (internalObjects == null) { internalObjects = new Dictionary (); } // always replace the existing value when we set internally internalObjects[key] = value; base[key] = value.ToString(); IsChanged = true; } #endregion #region Public Fields public override string this[string key] { get { // no need to check internalObjects since the string equivalent in base will // already have been set correctly when the value was originally passed in return base[key]; } set { PersistValue(key, value, false); } } #endregion #region Public Methods public override void Add(string key, string value) { PersistValue(key, value, true); } public override void Clear() { if (internalObjects != null) { internalObjects.Clear(); } base.Clear(); IsChanged = true; } public override void Remove(string key) { if (internalObjects != null && internalObjects.ContainsKey(key)) { internalObjects.Remove(key); } base.Remove(key); IsChanged = true; } #endregion } } // 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
- View.cs
- UnsafeNativeMethods.cs
- BridgeDataRecord.cs
- X509CertificateValidator.cs
- _CacheStreams.cs
- SID.cs
- AnnotationAdorner.cs
- Point3DCollection.cs
- ProtocolsSection.cs
- httpapplicationstate.cs
- ConstraintManager.cs
- GPPOINTF.cs
- DesignerListAdapter.cs
- Site.cs
- DTCTransactionManager.cs
- RowCache.cs
- CodeMemberProperty.cs
- Table.cs
- Matrix.cs
- ListItemCollection.cs
- XmlSchemaAnyAttribute.cs
- DocumentApplicationJournalEntry.cs
- ListBox.cs
- StylusButtonCollection.cs
- ValidationSettings.cs
- LabelAutomationPeer.cs
- ListViewContainer.cs
- DataMemberConverter.cs
- TextBoxAutoCompleteSourceConverter.cs
- ResXBuildProvider.cs
- unitconverter.cs
- DesignerUtility.cs
- FontDifferentiator.cs
- ToggleButtonAutomationPeer.cs
- SmtpTransport.cs
- ObjectKeyFrameCollection.cs
- SubclassTypeValidator.cs
- DockPatternIdentifiers.cs
- TransactionException.cs
- CursorConverter.cs
- DifferencingCollection.cs
- AppDomainShutdownMonitor.cs
- EntityDataSourceDesigner.cs
- HtmlEncodedRawTextWriter.cs
- ResourceAttributes.cs
- XhtmlBasicLabelAdapter.cs
- FastPropertyAccessor.cs
- ReadOnlyDictionary.cs
- DynamicValueConverter.cs
- DropDownList.cs
- ChannelSinkStacks.cs
- EventEntry.cs
- UpdatePanelTriggerCollection.cs
- UidManager.cs
- RenderContext.cs
- DrawingImage.cs
- ProvidePropertyAttribute.cs
- Site.cs
- _BasicClient.cs
- ListCommandEventArgs.cs
- HybridDictionary.cs
- MaskedTextProvider.cs
- Compiler.cs
- FormViewPagerRow.cs
- HyperLinkColumn.cs
- NotificationContext.cs
- Matrix3D.cs
- GridViewColumn.cs
- LinkArea.cs
- SmtpReplyReader.cs
- DesignerDataView.cs
- FunctionNode.cs
- ModelItemKeyValuePair.cs
- xmlformatgeneratorstatics.cs
- ConfigurationStrings.cs
- dbdatarecord.cs
- PolyBezierSegment.cs
- DataChangedEventManager.cs
- SystemGatewayIPAddressInformation.cs
- WebUtil.cs
- HttpClientCertificate.cs
- CommaDelimitedStringAttributeCollectionConverter.cs
- HtmlAnchor.cs
- XmlTypeMapping.cs
- Currency.cs
- FastEncoder.cs
- PerformanceCounterPermissionAttribute.cs
- MembershipPasswordException.cs
- DictionaryGlobals.cs
- PopupRoot.cs
- SignatureToken.cs
- AsyncPostBackErrorEventArgs.cs
- WebServiceTypeData.cs
- ConnectionModeReader.cs
- WebPartManagerInternals.cs
- WebPartConnectionsCancelEventArgs.cs
- DataSpaceManager.cs
- _LocalDataStore.cs
- AppSettingsExpressionBuilder.cs
- InvalidAsynchronousStateException.cs