Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / DurationConverter.cs / 1305600 / DurationConverter.cs
//------------------------------------------------------------------------------ // Microsoft Windows Client Platform // Copyright (c) Microsoft Corporation, 2004 // // File: DurationConverter.cs //----------------------------------------------------------------------------- using System; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Security; namespace System.Windows { ////// Provides a type converter to convert Duration to and from other representations. /// public class DurationConverter : TypeConverter { ////// CanConvertFrom - Returns whether or not this class can convert from a given type /// ///public override bool CanConvertFrom(ITypeDescriptorContext td, Type t) { if (t == typeof(string)) { return true; } else { return false; } } /// /// TypeConverter method override. /// /// ITypeDescriptorContext /// Type to convert to ///true if conversion is possible ///public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if ( destinationType == typeof(InstanceDescriptor) || destinationType == typeof(string)) { return true; } else { return false; } } /// /// ConvertFrom /// ///public override object ConvertFrom( ITypeDescriptorContext td, CultureInfo cultureInfo, object value) { string stringValue = value as string; // Override the converter for sentinel values if (stringValue != null) { stringValue = stringValue.Trim(); if (stringValue == "Automatic") { return Duration.Automatic; } else if (stringValue == "Forever") { return Duration.Forever; } } TimeSpan duration = TimeSpan.Zero; if(_timeSpanConverter == null) { _timeSpanConverter = new TimeSpanConverter(); } duration = (TimeSpan)_timeSpanConverter.ConvertFrom(td, cultureInfo, value); return new Duration(duration); } /// /// TypeConverter method implementation. /// /// ITypeDescriptorContext /// current culture (see CLR specs) /// value to convert from /// Type to convert to ///converted value ////// /// Critical: calls InstanceDescriptor ctor which LinkDemands /// PublicOK: can only make an InstanceDescriptor for Duration, not an arbitrary class /// [SecurityCritical] public override object ConvertTo( ITypeDescriptorContext context, CultureInfo cultureInfo, object value, Type destinationType) { if (destinationType != null && value is Duration) { Duration durationValue = (Duration)value; if (destinationType == typeof(InstanceDescriptor)) { MemberInfo mi; if (durationValue.HasTimeSpan) { mi = typeof(Duration).GetConstructor(new Type[] { typeof(TimeSpan) }); return new InstanceDescriptor(mi, new object[] { durationValue.TimeSpan }); } else if (durationValue == Duration.Forever) { mi = typeof(Duration).GetProperty("Forever"); return new InstanceDescriptor(mi, null); } else { Debug.Assert(durationValue == Duration.Automatic); // Only other legal duration type mi = typeof(Duration).GetProperty("Automatic"); return new InstanceDescriptor(mi, null); } } else if (destinationType == typeof(string)) { return durationValue.ToString(); } } // Pass unhandled cases to base class (which will throw exceptions for null value or destinationType.) return base.ConvertTo(context, cultureInfo, value, destinationType); } private static TimeSpanConverter _timeSpanConverter; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DebuggerAttributes.cs
- AppDomainGrammarProxy.cs
- QueryValue.cs
- ResourceDescriptionAttribute.cs
- RectAnimationClockResource.cs
- LocalizationComments.cs
- EntitySet.cs
- StatusBarItem.cs
- XamlReaderConstants.cs
- Vector3D.cs
- FlatButtonAppearance.cs
- WmfPlaceableFileHeader.cs
- AuthorizationRuleCollection.cs
- AttributeEmitter.cs
- ListParaClient.cs
- Evidence.cs
- RootAction.cs
- PolicyLevel.cs
- Authorization.cs
- StylusPoint.cs
- WeakReadOnlyCollection.cs
- WpfKnownType.cs
- SamlAudienceRestrictionCondition.cs
- MouseGesture.cs
- StorageInfo.cs
- EntityDataSourceChangingEventArgs.cs
- ReferencedCollectionType.cs
- IsolatedStorageFilePermission.cs
- ClientConfigurationSystem.cs
- ForAllOperator.cs
- TimeoutException.cs
- RowTypeElement.cs
- Route.cs
- CloudCollection.cs
- Content.cs
- BitStack.cs
- InfocardInteractiveChannelInitializer.cs
- GenerateTemporaryAssemblyTask.cs
- GridProviderWrapper.cs
- Claim.cs
- ListSortDescriptionCollection.cs
- DefaultValueConverter.cs
- DecimalConstantAttribute.cs
- SendContent.cs
- Constraint.cs
- SubqueryTrackingVisitor.cs
- BinarySerializer.cs
- TextContainerChangedEventArgs.cs
- HtmlControlDesigner.cs
- SqlCacheDependencyDatabase.cs
- COM2TypeInfoProcessor.cs
- SizeAnimationUsingKeyFrames.cs
- FontStyleConverter.cs
- TextEditorDragDrop.cs
- ListManagerBindingsCollection.cs
- GridItemPattern.cs
- MetadataUtilsSmi.cs
- XdrBuilder.cs
- DelayedRegex.cs
- SqlGatherProducedAliases.cs
- JsonEncodingStreamWrapper.cs
- EmptyControlCollection.cs
- PointHitTestResult.cs
- BigInt.cs
- DataGridViewColumnCollection.cs
- DiscriminatorMap.cs
- Header.cs
- MessageSecurityOverTcp.cs
- MSHTMLHostUtil.cs
- Executor.cs
- ActivityTypeDesigner.xaml.cs
- WebUtil.cs
- TreeWalker.cs
- FlowLayoutPanelDesigner.cs
- Path.cs
- MergeLocalizationDirectives.cs
- DodSequenceMerge.cs
- XmlExceptionHelper.cs
- WindowsToolbarItemAsMenuItem.cs
- MultiPageTextView.cs
- ApplicationProxyInternal.cs
- NetworkAddressChange.cs
- MetadataItemSerializer.cs
- TableRow.cs
- DocumentPageHost.cs
- NativeMethods.cs
- ColumnResizeAdorner.cs
- FunctionNode.cs
- Scripts.cs
- UICuesEvent.cs
- SafeLocalAllocation.cs
- ColorKeyFrameCollection.cs
- TiffBitmapEncoder.cs
- PrivilegeNotHeldException.cs
- SqlDataReaderSmi.cs
- DbConnectionStringBuilder.cs
- VersionedStream.cs
- GroupBoxRenderer.cs
- ProfileModule.cs
- NameValueConfigurationCollection.cs