Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / PointConverter.cs / 1305376 / PointConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Drawing { using System.Runtime.Serialization.Formatters; using System.Runtime.InteropServices; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using Microsoft.Win32; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Globalization; using System.Reflection; ////// /// PointConverter is a class that can be used to convert /// Point from one data type to another. Access this /// class through the TypeDescriptor. /// public class PointConverter : TypeConverter { ////// /// Determines if this converter can convert an object in the given source /// type to the native type of the converter. /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) { return true; } return base.CanConvertFrom(context, sourceType); } ////// /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor)) { return true; } return base.CanConvertTo(context, destinationType); } ///Gets a value indicating whether this converter can /// convert an object to the given destination type using the context. ////// /// Converts the given object to the converter's native type. /// [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { string strValue = value as string; if (strValue != null) { string text = strValue.Trim(); if (text.Length == 0) { return null; } else { // Parse 2 integer values. // if (culture == null) { culture = CultureInfo.CurrentCulture; } char sep = culture.TextInfo.ListSeparator[0]; string[] tokens = text.Split(new char[] {sep}); int[] values = new int[tokens.Length]; TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int)); for (int i = 0; i < values.Length; i++) { // Note: ConvertFromString will raise exception if value cannot be converted. values[i] = (int)intConverter.ConvertFromString(context, culture, tokens[i]); } if (values.Length == 2) { return new Point(values[0], values[1]); } else { throw new ArgumentException(SR.GetString(SR.TextParseFailedFormat, text, "x, y")); } } } return base.ConvertFrom(context, culture, value); } ////// /// Converts the given object to another type. The most common types to convert /// are to and from a string object. The default implementation will make a call /// to ToString on the object if the object is valid and if the destination /// type is string. If this cannot convert to the desitnation type, this will /// throw a NotSupportedException. /// public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if(value is Point){ if (destinationType == typeof(string)) { Point pt = (Point)value; if (culture == null) { culture = CultureInfo.CurrentCulture; } string sep = culture.TextInfo.ListSeparator + " "; TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int)); string[] args = new string[2]; int nArg = 0; // Note: ConvertToString will raise exception if value cannot be converted. args[nArg++] = intConverter.ConvertToString(context, culture, pt.X); args[nArg++] = intConverter.ConvertToString(context, culture, pt.Y); return string.Join(sep, args); } if (destinationType == typeof(InstanceDescriptor)) { Point pt = (Point)value; ConstructorInfo ctor = typeof(Point).GetConstructor(new Type[] {typeof(int), typeof(int)}); if (ctor != null) { return new InstanceDescriptor(ctor, new object[] {pt.X, pt.Y}); } } } return base.ConvertTo(context, culture, value, destinationType); } ////// /// Creates an instance of this type given a set of property values /// for the object. This is useful for objects that are immutable, but still /// want to provide changable properties. /// [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] [SuppressMessage("Microsoft.Security", "CA2102:CatchNonClsCompliantExceptionsInGeneralHandlers")] public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) { if( propertyValues == null ) { throw new ArgumentNullException( "propertyValues" ); } object x = propertyValues["X"]; object y = propertyValues["Y"]; if(x == null || y == null || !(x is int) || !(y is int)) { throw new ArgumentException(SR.GetString(SR.PropertyValueInvalidEntry)); } return new Point((int)x, (int)y); } ////// /// Determines if changing a value on this object should require a call to /// CreateInstance to create a new value. /// public override bool GetCreateInstanceSupported(ITypeDescriptorContext context) { return true; } ////// /// Retrieves the set of properties for this type. By default, a type has /// does not return any properties. An easy implementation of this method /// can just call TypeDescriptor.GetProperties for the correct data type. /// public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) { PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(Point), attributes); return props.Sort(new string[] {"X", "Y"}); } ////// /// Determines if this object supports properties. By default, this /// is false. /// public override bool GetPropertiesSupported(ITypeDescriptorContext context) { return true; } } } // 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
- FileDataSource.cs
- FixedTextSelectionProcessor.cs
- CTreeGenerator.cs
- SafePEFileHandle.cs
- WeakReference.cs
- EntityCommandExecutionException.cs
- ExcCanonicalXml.cs
- TextBox.cs
- TrustVersion.cs
- ErrorFormatterPage.cs
- CacheMemory.cs
- UTF8Encoding.cs
- FileDetails.cs
- TraceData.cs
- Style.cs
- panel.cs
- ProxyFragment.cs
- ProjectedSlot.cs
- DeferredSelectedIndexReference.cs
- SqlBinder.cs
- HtmlShim.cs
- CodeIndexerExpression.cs
- PageCache.cs
- Propagator.JoinPropagator.cs
- XmlUtil.cs
- CryptoApi.cs
- RelationshipDetailsRow.cs
- PropertyValueChangedEvent.cs
- NullableConverter.cs
- FixedSOMLineRanges.cs
- XDRSchema.cs
- ElementHostPropertyMap.cs
- FlowLayout.cs
- AppDomainFactory.cs
- RangeBaseAutomationPeer.cs
- TheQuery.cs
- BufferedReadStream.cs
- AssemblyNameEqualityComparer.cs
- Mutex.cs
- DialogResultConverter.cs
- DayRenderEvent.cs
- PointAnimationBase.cs
- SecurityListenerSettingsLifetimeManager.cs
- SortDescriptionCollection.cs
- DBParameter.cs
- FilteredDataSetHelper.cs
- Icon.cs
- KnownBoxes.cs
- CookieParameter.cs
- ResourceDisplayNameAttribute.cs
- XmlNodeChangedEventArgs.cs
- WindowsSolidBrush.cs
- HtmlWindow.cs
- SqlCharStream.cs
- UpdatePanel.cs
- StringBlob.cs
- GeneralTransform3DGroup.cs
- DragAssistanceManager.cs
- ValidationEventArgs.cs
- controlskin.cs
- MailMessageEventArgs.cs
- GroupBoxRenderer.cs
- PointHitTestResult.cs
- PointLightBase.cs
- ConsoleEntryPoint.cs
- XmlSchemaSearchPattern.cs
- TableLayoutPanelCellPosition.cs
- SqlPersonalizationProvider.cs
- SecUtil.cs
- PackageFilter.cs
- StrokeNodeEnumerator.cs
- RichTextBox.cs
- ParameterToken.cs
- UnauthorizedWebPart.cs
- TableRowsCollectionEditor.cs
- InputManager.cs
- JsonGlobals.cs
- DataContractFormatAttribute.cs
- Scripts.cs
- SqlWebEventProvider.cs
- TransactionException.cs
- SqlDataSourceCustomCommandPanel.cs
- ModuleBuilderData.cs
- FontDialog.cs
- QEncodedStream.cs
- ManipulationLogic.cs
- SqlDataReader.cs
- ValidatedControlConverter.cs
- ObjectStateEntry.cs
- CookieHandler.cs
- SQLResource.cs
- TextFormatterHost.cs
- DeadCharTextComposition.cs
- BindingMAnagerBase.cs
- WebService.cs
- FontDriver.cs
- AnnotationStore.cs
- ViewPort3D.cs
- XmlEventCache.cs
- TextCompositionManager.cs