DateTimeOffsetConverter.cs source code in C# .NET

                        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; 

    ///  
    /// Provides a type converter to convert  
    /// objects to and from various other representations.
    ///  
    [HostProtection(SharedState = true)]
    public class DateTimeOffsetConverter : TypeConverter {

        ///  
        ///    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 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 to the given destination type using the context.
        /// 
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
            if (destinationType == typeof(InstanceDescriptor)) { 
                return true;
            } 
            return base.CanConvertTo(context, destinationType); 
        }
 
        /// 
        /// Converts the given value object to a 
        /// object.
        ///  
        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
        /// using the arguments.
        /// 
        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.
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DateTimeOffsetConverter.cs source code in C# .NET

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