Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / PointConverter.cs / 1 / 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. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- UIntPtr.cs
- XamlVector3DCollectionSerializer.cs
- XmlSignatureProperties.cs
- IteratorDescriptor.cs
- ReadOnlyPropertyMetadata.cs
- FileFormatException.cs
- CatalogPart.cs
- ContextStaticAttribute.cs
- Span.cs
- SecurityHeader.cs
- CompilerGeneratedAttribute.cs
- ExceptionUtil.cs
- XmlSchemaChoice.cs
- XmlSchemaException.cs
- StringSource.cs
- TableLayoutSettingsTypeConverter.cs
- MetadataSerializer.cs
- RenamedEventArgs.cs
- CqlErrorHelper.cs
- FixedSOMTable.cs
- WindowsContainer.cs
- NetworkStream.cs
- TypeCacheManager.cs
- NoResizeSelectionBorderGlyph.cs
- WrappedReader.cs
- XslException.cs
- WeakRefEnumerator.cs
- TransactionFlowProperty.cs
- _ChunkParse.cs
- Logging.cs
- MatrixIndependentAnimationStorage.cs
- TileBrush.cs
- AsyncResult.cs
- SqlNode.cs
- NavigationEventArgs.cs
- CachedTypeface.cs
- InheritanceContextHelper.cs
- ContextConfiguration.cs
- EntityCommandDefinition.cs
- EditorAttribute.cs
- ArgumentValidation.cs
- CodeThrowExceptionStatement.cs
- TextAutomationPeer.cs
- EditableTreeList.cs
- UnsafeNativeMethodsCLR.cs
- CorrelationService.cs
- XPathException.cs
- SplineQuaternionKeyFrame.cs
- XmlObjectSerializerReadContextComplex.cs
- EdmProviderManifest.cs
- BinHexDecoder.cs
- ManipulationDevice.cs
- util.cs
- DelegateSerializationHolder.cs
- XhtmlBasicSelectionListAdapter.cs
- XmlTypeAttribute.cs
- MeshGeometry3D.cs
- HtmlTextBoxAdapter.cs
- Missing.cs
- ScopedKnownTypes.cs
- TouchesOverProperty.cs
- XmlSchemaSimpleContent.cs
- ListItemConverter.cs
- DiagnosticSection.cs
- XmlSchemaDocumentation.cs
- OledbConnectionStringbuilder.cs
- InstanceOwner.cs
- TextTreePropertyUndoUnit.cs
- CacheVirtualItemsEvent.cs
- HtmlInputControl.cs
- Light.cs
- WebResponse.cs
- BufferedReadStream.cs
- XamlPathDataSerializer.cs
- IndentTextWriter.cs
- QilList.cs
- ControlEvent.cs
- ToolStripItemTextRenderEventArgs.cs
- OracleParameterBinding.cs
- GradientStopCollection.cs
- IncomingWebResponseContext.cs
- CodeNamespaceImportCollection.cs
- WebProxyScriptElement.cs
- SmiMetaData.cs
- LinqDataSourceContextEventArgs.cs
- HyperLinkColumn.cs
- OdbcFactory.cs
- DataServiceRequestException.cs
- StartFileNameEditor.cs
- Matrix.cs
- TypeTypeConverter.cs
- XmlDocumentViewSchema.cs
- CmsInterop.cs
- OciEnlistContext.cs
- DesignerActionHeaderItem.cs
- TaskHelper.cs
- ViewgenContext.cs
- FormatConvertedBitmap.cs
- PropertyManager.cs
- FormsIdentity.cs