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
![Network programming in C#, Network Programming in VB.NET, Network Programming in .NET](/images/book.jpg)
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ExcludePathInfo.cs
- ExpressionBuilderContext.cs
- _BaseOverlappedAsyncResult.cs
- BackgroundFormatInfo.cs
- DesignerAutoFormatCollection.cs
- MouseGestureConverter.cs
- EncryptedPackageFilter.cs
- SessionKeyExpiredException.cs
- TaskHelper.cs
- ContentControl.cs
- ErrorHandlingReceiver.cs
- Vector.cs
- PersonalizationStateInfoCollection.cs
- TableLayoutSettings.cs
- ProxyManager.cs
- NamespaceList.cs
- BitmapEffectGeneralTransform.cs
- Pair.cs
- AppDomainAttributes.cs
- XmlNullResolver.cs
- InputMethodStateTypeInfo.cs
- RequestCacheValidator.cs
- SecurityPermission.cs
- Attributes.cs
- DataGridViewRowsAddedEventArgs.cs
- HttpResponse.cs
- DocumentationServerProtocol.cs
- DBAsyncResult.cs
- ProfileBuildProvider.cs
- SkewTransform.cs
- CommandBinding.cs
- TaiwanLunisolarCalendar.cs
- DynamicExpression.cs
- XmlEncoding.cs
- IIS7UserPrincipal.cs
- ValidationHelper.cs
- BulletChrome.cs
- StyleSelector.cs
- SqlNotificationEventArgs.cs
- PathTooLongException.cs
- ModuleElement.cs
- ThreadSafeList.cs
- DragStartedEventArgs.cs
- PolygonHotSpot.cs
- NamespaceExpr.cs
- AppDomainProtocolHandler.cs
- LogLogRecord.cs
- x509utils.cs
- GenericTypeParameterBuilder.cs
- CheckoutException.cs
- CreateUserErrorEventArgs.cs
- AttributeProviderAttribute.cs
- ValidatorCompatibilityHelper.cs
- Splitter.cs
- ClusterRegistryConfigurationProvider.cs
- MenuItem.cs
- QueryTaskGroupState.cs
- ToolStripItemRenderEventArgs.cs
- DateTimeFormatInfo.cs
- DockPanel.cs
- ImageUrlEditor.cs
- CreateUserErrorEventArgs.cs
- DesignerPerfEventProvider.cs
- MobileListItemCollection.cs
- XslException.cs
- CatalogZoneAutoFormat.cs
- PropertyInfoSet.cs
- ListBoxChrome.cs
- JournalEntryListConverter.cs
- EndGetFileNameFromUserRequest.cs
- Task.cs
- ImageDrawing.cs
- SchemaObjectWriter.cs
- WebPartTransformerCollection.cs
- StorageRoot.cs
- OpenTypeLayout.cs
- TickBar.cs
- KeyMatchBuilder.cs
- MissingMethodException.cs
- ControlValuePropertyAttribute.cs
- SchemaAttDef.cs
- SafeHandles.cs
- ParserExtension.cs
- ObjectListField.cs
- serverconfig.cs
- CodeTypeOfExpression.cs
- MethodImplAttribute.cs
- XmlElement.cs
- ExpressionBindings.cs
- FactoryGenerator.cs
- HtmlControlDesigner.cs
- dbdatarecord.cs
- XmlCharCheckingWriter.cs
- SystemTcpConnection.cs
- SHA1.cs
- SingleStorage.cs
- UpdateCommandGenerator.cs
- ThousandthOfEmRealDoubles.cs
- NumberFunctions.cs
- _IPv6Address.cs