Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / System / ComponentModel / DateTimeOffsetConverter.cs / 1305376 / DateTimeOffsetConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* DevDiv Bugs 181818: DateTimeOffset should have a type converter just like DateTime. This converter should behave just like DateTimeConverter only it should convert DateTimeOffsets. The code was copied from DateTimeConverter and adapted for DateTimeOffset. */ namespace System.ComponentModel { using Microsoft.Win32; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Runtime.InteropServices; using System.Runtime.Remoting; using System.Runtime.Serialization.Formatters; using System.Security.Permissions; ////// [HostProtection(SharedState = true)] public class DateTimeOffsetConverter : TypeConverter { ///Provides a type converter to convert ////// objects to and from various other representations. /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) { return true; } return base.CanConvertFrom(context, sourceType); } ///Gets a value indicating whether this converter can /// convert an object in the given source type to a ////// object using the /// specified context. /// 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. ////// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value is string) { string text = ((string)value).Trim(); if (text.Length == 0) { return DateTimeOffset.MinValue; } try { // See if we have a culture info to parse with. If so, then use it. // DateTimeFormatInfo formatInfo = null; if (culture != null ) { formatInfo = (DateTimeFormatInfo)culture.GetFormat(typeof(DateTimeFormatInfo)); } if (formatInfo != null) { return DateTimeOffset.Parse(text, formatInfo); } else { return DateTimeOffset.Parse(text, culture); } } catch (FormatException e) { throw new FormatException(SR.GetString(SR.ConvertInvalidPrimitive, (string)value, "DateTimeOffset"), e); } } return base.ConvertFrom(context, culture, value); } ///Converts the given value object to a ////// object. /// public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { // logic is exactly as in DateTimeConverter, only the offset pattern ' zzz' is added to the default // ConvertToString pattern. if (destinationType == typeof(string) && value is DateTimeOffset) { DateTimeOffset dto = (DateTimeOffset) value; if (dto == DateTimeOffset.MinValue) { return string.Empty; } if (culture == null) { culture = CultureInfo.CurrentCulture; } DateTimeFormatInfo formatInfo = null; formatInfo = (DateTimeFormatInfo)culture.GetFormat(typeof(DateTimeFormatInfo)); string format; if (culture == CultureInfo.InvariantCulture) { // note: the y/m/d format used when there is or isn't a time component is not consistent // when the culture is invariant, because for some reason InvariantCulture's date format is // MM/dd/yyyy. However, this matches the behavior of DateTimeConverter so it is preserved here. if (dto.TimeOfDay.TotalSeconds == 0) { // pattern just like DateTimeConverter when DateTime.TimeOfDay.TotalSeconds==0 // but with ' zzz' offset pattern added. return dto.ToString("yyyy-MM-dd zzz", culture); } else { return dto.ToString(culture); } } if (dto.TimeOfDay.TotalSeconds == 0) { // pattern just like DateTimeConverter when DateTime.TimeOfDay.TotalSeconds==0 // but with ' zzz' offset pattern added. format = formatInfo.ShortDatePattern + " zzz"; } else { // pattern just like DateTimeConverter when DateTime.TimeOfDay.TotalSeconds!=0 // but with ' zzz' offset pattern added. format = formatInfo.ShortDatePattern + " " + formatInfo.ShortTimePattern + " zzz"; } return dto.ToString(format, CultureInfo.CurrentCulture); } if (destinationType == typeof(InstanceDescriptor) && value is DateTimeOffset) { DateTimeOffset dto = (DateTimeOffset)value; if (dto.Ticks == 0) { // Make a special case for the empty DateTimeOffset // ConstructorInfo ctr = typeof(DateTimeOffset).GetConstructor(new Type[] {typeof(Int64)}); if (ctr != null) { return new InstanceDescriptor(ctr, new object[] { dto.Ticks }); } } ConstructorInfo ctor = typeof(DateTimeOffset).GetConstructor(new Type[] { typeof(int), typeof(int), typeof(int), typeof(int), typeof(int), typeof(int), typeof(int), typeof(TimeSpan) }); if (ctor != null) { return new InstanceDescriptor(ctor, new object[] { dto.Year, dto.Month, dto.Day, dto.Hour, dto.Minute, dto.Second, dto.Millisecond, dto.Offset }); } } return base.ConvertTo(context, culture, value, destinationType); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.Converts the given value object to a ////// object /// using the arguments.
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