//------------------------------------------------------------------------------ // // 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, culture); } 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); } } }