DateTimeConverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / DateTimeConverter.cs / 1 / DateTimeConverter.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
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 DateTimeConverter : 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 DateTime.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 DateTime.Parse(text, formatInfo);
                    } 
                    else {
                        return DateTime.Parse(text, culture);
                    }
                } 
                catch (FormatException e) {
                    throw new FormatException(SR.GetString(SR.ConvertInvalidPrimitive, (string)value, "DateTime"), 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) { 
            if (destinationType == typeof(string) && value is DateTime) {
                DateTime dt = (DateTime) value;
                if (dt == DateTime.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) { 
                    if (dt.TimeOfDay.TotalSeconds == 0) { 
                        return dt.ToString("yyyy-MM-dd", culture);
                    } 
                    else {
                        return dt.ToString(culture);
                    }
                } 
                if (dt.TimeOfDay.TotalSeconds == 0) {
                    format = formatInfo.ShortDatePattern; 
                } 
                else {
                    format = formatInfo.ShortDatePattern + " " + formatInfo.ShortTimePattern; 
                }

                return dt.ToString(format, CultureInfo.CurrentCulture);
            } 
            if (destinationType == typeof(InstanceDescriptor) && value is DateTime) {
                DateTime dt = (DateTime)value; 
 
                if (dt.Ticks == 0) {
                    // Make a special case for the empty DateTime 
                    //
                    ConstructorInfo ctr = typeof(DateTime).GetConstructor(new Type[] {typeof(Int64)});

                    if (ctr != null) { 
                        return new InstanceDescriptor(ctr, new object[] {
                            dt.Ticks }); 
                    } 
                }
 
                ConstructorInfo ctor = typeof(DateTime).GetConstructor(new Type[] {
                    typeof(int), typeof(int), typeof(int), typeof(int),
                    typeof(int), typeof(int), typeof(int)});
 
                if (ctor != null) {
                    return new InstanceDescriptor(ctor, new object[] { 
                        dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, dt.Second, dt.Millisecond}); 
                }
            } 

            return base.ConvertTo(context, culture, value, destinationType);
        }
    } 
}

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