Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Printing / MarginsConverter.cs / 1 / MarginsConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Drawing.Printing { 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; ////// /// public class MarginsConverter : ExpandableObjectConverter { ///Provides a /// type converter to convert ///to and from various other representations, such as a string. /// /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) { return true; } return base.CanConvertFrom(context, sourceType); } ///Determines if a converter can convert an object of the given source /// type to the native type of the converter. ////// /// 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 4 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 != 4) { throw new ArgumentException(SR.GetString(SR.TextParseFailedFormat, text, "left, right, top, bottom")); } return new Margins(values[0], values[1], values[2], values[3]); } } 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. /// [SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")] public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if( value is Margins ){ if (destinationType == typeof(string)) { Margins margins = (Margins)value; if (culture == null) { culture = CultureInfo.CurrentCulture; } string sep = culture.TextInfo.ListSeparator + " "; TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int)); string[] args = new string[4]; int nArg = 0; // Note: ConvertToString will raise exception if value cannot be converted. args[nArg++] = intConverter.ConvertToString(context, culture, margins.Left); args[nArg++] = intConverter.ConvertToString(context, culture, margins.Right); args[nArg++] = intConverter.ConvertToString(context, culture, margins.Top); args[nArg++] = intConverter.ConvertToString(context, culture, margins.Bottom); return string.Join(sep, args); } if (destinationType == typeof(InstanceDescriptor)) { Margins margins = (Margins)value; ConstructorInfo ctor = typeof(Margins).GetConstructor(new Type[] { typeof(int), typeof(int), typeof(int), typeof(int)}); if (ctor != null) { return new InstanceDescriptor(ctor, new object[] { margins.Left, margins.Right, margins.Top, margins.Bottom}); } } } 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 left = propertyValues["Left"]; object right = propertyValues["Right"]; object top = propertyValues["Top"]; object bottom = propertyValues["Bottom"]; if(left == null || right == null || bottom == null || top == null || !(left is int) || !(right is int) || !(bottom is int) || !(top is int)) { throw new ArgumentException(SR.GetString(SR.PropertyValueInvalidEntry)); } return new Margins((int)left, (int)right, (int)top, (int)bottom); } ////// /// 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; } } } // 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
- Location.cs
- TypeResolver.cs
- streamingZipPartStream.cs
- GatewayDefinition.cs
- URLIdentityPermission.cs
- KeySplineConverter.cs
- precedingsibling.cs
- DocumentPaginator.cs
- XamlSerializerUtil.cs
- FilteredDataSetHelper.cs
- GestureRecognitionResult.cs
- ComponentResourceManager.cs
- VersionPair.cs
- UnauthorizedAccessException.cs
- SQLDouble.cs
- PlatformNotSupportedException.cs
- TableLayoutPanel.cs
- WebPartTransformerAttribute.cs
- DataControlFieldCell.cs
- JpegBitmapEncoder.cs
- CriticalHandle.cs
- XmlKeywords.cs
- RightsController.cs
- XmlSchemaValidationException.cs
- Expression.DebuggerProxy.cs
- TimeoutValidationAttribute.cs
- ByteStreamMessageEncoderFactory.cs
- DataControlLinkButton.cs
- OdbcConnectionHandle.cs
- ProcessRequestAsyncResult.cs
- FileClassifier.cs
- OracleColumn.cs
- ReplyChannelAcceptor.cs
- CodeTypeOfExpression.cs
- OutputCacheSettings.cs
- ParserStack.cs
- GridViewCellAutomationPeer.cs
- Int32CollectionConverter.cs
- Bidi.cs
- FreezableDefaultValueFactory.cs
- SoapProtocolImporter.cs
- StructuralType.cs
- Util.cs
- DataListAutoFormat.cs
- XpsFontSerializationService.cs
- EventArgs.cs
- DependencyObject.cs
- ActivityDesignerHighlighter.cs
- FlowDocumentScrollViewer.cs
- RuntimeConfigLKG.cs
- ElementHost.cs
- XPathNodePointer.cs
- RichTextBoxDesigner.cs
- XmlToDatasetMap.cs
- ObjectFullSpanRewriter.cs
- WebService.cs
- CodeSnippetTypeMember.cs
- ArrayListCollectionBase.cs
- SkinIDTypeConverter.cs
- NavigationPropertyEmitter.cs
- BitHelper.cs
- Quaternion.cs
- CriticalHandle.cs
- LocalizationParserHooks.cs
- HostingEnvironmentException.cs
- DbConnectionStringCommon.cs
- Token.cs
- MD5CryptoServiceProvider.cs
- DBCommandBuilder.cs
- ButtonFieldBase.cs
- SelectingProviderEventArgs.cs
- CompilerState.cs
- WebPartTransformerAttribute.cs
- EventEntry.cs
- SafeMILHandleMemoryPressure.cs
- DebugView.cs
- X509SecurityTokenAuthenticator.cs
- RegexMatch.cs
- WmlTextViewAdapter.cs
- SymbolType.cs
- FilterableAttribute.cs
- RSATokenProvider.cs
- XmlSchemaAnnotation.cs
- ListViewItemCollectionEditor.cs
- RawStylusSystemGestureInputReport.cs
- SSmlParser.cs
- TextOptionsInternal.cs
- StateBag.cs
- XmlElementAttributes.cs
- WebPartMenu.cs
- QilTypeChecker.cs
- EventLogInformation.cs
- DataGridViewRowEventArgs.cs
- ListParaClient.cs
- DrawingAttributes.cs
- Double.cs
- CircleHotSpot.cs
- DesigntimeLicenseContextSerializer.cs
- MetadataUtilsSmi.cs
- TextFormatterHost.cs