Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / DPTypeDescriptorContext.cs / 1 / DPTypeDescriptorContext.cs
//---------------------------------------------------------------------------- // // File: TextRangeSerialization.cs // // Copyright (C) Microsoft Corporation. All rights reserved. // // Description: Set of static methods implementing text range serialization // //--------------------------------------------------------------------------- namespace System.Windows.Documents { using MS.Internal; using System.Windows; using System.Globalization; using System.Windows.Media; ////// An object implementing ITypeDescriptorContext intended to be used in serialization /// scenarios for checking whether a particular value can be converted to a string /// internal class DPTypeDescriptorContext : System.ComponentModel.ITypeDescriptorContext { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors private DPTypeDescriptorContext(DependencyProperty property, object propertyValue) { Invariant.Assert(property != null, "property == null"); Invariant.Assert(propertyValue != null, "propertyValue == null"); Invariant.Assert(property.IsValidValue(propertyValue), "propertyValue must be of suitable type for the given dependency property"); _property = property; _propertyValue = propertyValue; } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods // Returns non-null string if this value can be converted to a string, // null otherwise. internal static string GetStringValue(DependencyProperty property, object propertyValue) { string stringValue = null; // Special cases working around incorrectly implemented type converters if (property == UIElement.BitmapEffectProperty) { return null; // Always treat BitmapEffects as complex value } if (property == Inline.TextDecorationsProperty) { stringValue = TextDecorationsFixup((TextDecorationCollection)propertyValue); } else if (typeof(CultureInfo).IsAssignableFrom(property.PropertyType)) //NumberSubstitution.CultureOverrideProperty { stringValue = CultureInfoFixup(property, (CultureInfo)propertyValue); } if (stringValue == null) { DPTypeDescriptorContext context = new DPTypeDescriptorContext(property, propertyValue); System.ComponentModel.TypeConverter typeConverter = System.ComponentModel.TypeDescriptor.GetConverter(property.PropertyType); Invariant.Assert(typeConverter != null); if (typeConverter.CanConvertTo(context, typeof(string))) { stringValue = (string)typeConverter.ConvertTo( context, System.Globalization.CultureInfo.InvariantCulture, propertyValue, typeof(string)); } } return stringValue; } #endregion Internal Methods #region Private Methods private static string TextDecorationsFixup(TextDecorationCollection textDecorations) { string stringValue = null; // Work around for incorrect serialization for TextDecorations property // // Special case for TextDecorations serialization if (TextDecorations.Underline.ValueEquals(textDecorations)) { stringValue = "Underline"; } else if (TextDecorations.Strikethrough.ValueEquals(textDecorations)) { stringValue = "Strikethrough"; } else if (TextDecorations.OverLine.ValueEquals(textDecorations)) { stringValue = "OverLine"; } else if (TextDecorations.Baseline.ValueEquals(textDecorations)) { stringValue = "Baseline"; } else if (textDecorations.Count == 0) { stringValue = string.Empty; } return stringValue; } private static string CultureInfoFixup(DependencyProperty property, CultureInfo cultureInfo) { string stringValue = null; // Parser uses a specific type coverter for converting instances of other types to and from CultureInfo. // This class differs from System.ComponentModel.CultureInfoConverter, the default type converter // for the CultureInfo class. // It uses a string representation based on the IetfLanguageTag property rather than the Name property // (i.e., RFC 3066 rather than RFC 1766). // In order to guarantee roundtripability of serialized xaml, textrange serialization needs to use // this type coverter for CultureInfo types. DPTypeDescriptorContext context = new DPTypeDescriptorContext(property, cultureInfo); System.ComponentModel.TypeConverter typeConverter = new CultureInfoIetfLanguageTagConverter(); if (typeConverter.CanConvertTo(context, typeof(string))) { stringValue = (string)typeConverter.ConvertTo( context, System.Globalization.CultureInfo.InvariantCulture, cultureInfo, typeof(string)); } return stringValue; } #endregion Private Methods //------------------------------------------------------ // // Interface ITypeDescriptorContext // //------------------------------------------------------ #region ITypeDescriptorContext Members System.ComponentModel.IContainer System.ComponentModel.ITypeDescriptorContext.Container { get { return null; } } // Returns a value of a property - to be detected for convertability to string in a type converter object System.ComponentModel.ITypeDescriptorContext.Instance { get { return _propertyValue; } } void System.ComponentModel.ITypeDescriptorContext.OnComponentChanged() { } bool System.ComponentModel.ITypeDescriptorContext.OnComponentChanging() { return false; } System.ComponentModel.PropertyDescriptor System.ComponentModel.ITypeDescriptorContext.PropertyDescriptor { get { return null; } } #endregion #region IServiceProvider Members object IServiceProvider.GetService(Type serviceType) { return null; } #endregion #region Private Fields private DependencyProperty _property; private object _propertyValue; #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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