Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / DurationConverter.cs / 2 / DurationConverter.cs
//------------------------------------------------------------------------------ // Microsoft Windows Client Platform // Copyright (c) Microsoft Corporation, 2004 // // File: DurationConverter.cs //----------------------------------------------------------------------------- using System; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Security; namespace System.Windows { ////// Provides a type converter to convert Duration to and from other representations. /// public class DurationConverter : TypeConverter { ////// CanConvertFrom - Returns whether or not this class can convert from a given type /// ///public override bool CanConvertFrom(ITypeDescriptorContext td, Type t) { if (t == typeof(string)) { return true; } else { return false; } } /// /// TypeConverter method override. /// /// ITypeDescriptorContext /// Type to convert to ///true if conversion is possible ///public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if ( destinationType == typeof(InstanceDescriptor) || destinationType == typeof(string)) { return true; } else { return false; } } /// /// ConvertFrom /// ///public override object ConvertFrom( ITypeDescriptorContext td, CultureInfo cultureInfo, object value) { string stringValue = value as string; // Override the converter for sentinel values if (stringValue != null) { stringValue = stringValue.Trim(); if (stringValue == "Automatic") { return Duration.Automatic; } else if (stringValue == "Forever") { return Duration.Forever; } } TimeSpan duration = TimeSpan.Zero; if(_timeSpanConverter == null) { _timeSpanConverter = new TimeSpanConverter(); } duration = (TimeSpan)_timeSpanConverter.ConvertFrom(td, cultureInfo, value); return new Duration(duration); } /// /// TypeConverter method implementation. /// /// ITypeDescriptorContext /// current culture (see CLR specs) /// value to convert from /// Type to convert to ///converted value ////// /// Critical: calls InstanceDescriptor ctor which LinkDemands /// PublicOK: can only make an InstanceDescriptor for Duration, not an arbitrary class /// [SecurityCritical] public override object ConvertTo( ITypeDescriptorContext context, CultureInfo cultureInfo, object value, Type destinationType) { if (destinationType != null && value is Duration) { Duration durationValue = (Duration)value; if (destinationType == typeof(InstanceDescriptor)) { MemberInfo mi; if (durationValue.HasTimeSpan) { mi = typeof(Duration).GetConstructor(new Type[] { typeof(TimeSpan) }); return new InstanceDescriptor(mi, new object[] { durationValue.TimeSpan }); } else if (durationValue == Duration.Forever) { mi = typeof(Duration).GetProperty("Forever"); return new InstanceDescriptor(mi, null); } else { Debug.Assert(durationValue == Duration.Automatic); // Only other legal duration type mi = typeof(Duration).GetProperty("Automatic"); return new InstanceDescriptor(mi, null); } } else if (destinationType == typeof(string)) { return durationValue.ToString(); } } // Pass unhandled cases to base class (which will throw exceptions for null value or destinationType.) return base.ConvertTo(context, cultureInfo, value, destinationType); } private static TimeSpanConverter _timeSpanConverter; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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