TimeSpanConverter.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 / TimeSpanConverter.cs / 1 / TimeSpanConverter.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;
    using System.Threading; 

    /// 
    /// Provides a type converter to convert 
    /// objects to and from various 
    /// other representations.
    ///  
    [HostProtection(SharedState = true)] 
    public class TimeSpanConverter : 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 object to a 
        /// object. 
        /// 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture,  object value) {
            if (value is string) {
                string text = ((string)value).Trim(); 
                try {
                    return TimeSpan.Parse(text); 
                } 
                catch (FormatException e) {
                    throw new FormatException(SR.GetString(SR.ConvertInvalidPrimitive, (string)value, "TimeSpan"), e); 
                }
            }

            return base.ConvertFrom(context, culture, value); 
        }
 
        ///  
        ///      Converts the given object to another type.  The most common types to convert
        ///      are to and from a string object.  The default implementation will make a call 
        ///      to ToString on the object if the object is valid and if the destination
        ///      type is string.  If this cannot convert to the desitnation type, this will
        ///      throw a NotSupportedException.
        ///  
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
            if (destinationType == null) { 
                throw new ArgumentNullException("destinationType"); 
            }
 
            if (destinationType == typeof(InstanceDescriptor) && value is TimeSpan) {
                MethodInfo method = typeof(TimeSpan).GetMethod("Parse", new Type[] {typeof(string)});
                if (method != null) {
                    return new InstanceDescriptor(method, new object[] {value.ToString()}); 
                }
            } 
 
            return base.ConvertTo(context, culture, value, destinationType);
        } 
    }
}

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