95 lines
3.9 KiB
C#
95 lines
3.9 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="TimeSpanConverter.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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/*
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*/
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namespace System.ComponentModel {
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using Microsoft.Win32;
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using System.ComponentModel.Design.Serialization;
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using System.Diagnostics;
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using System.Globalization;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Runtime.Remoting;
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using System.Runtime.Serialization.Formatters;
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using System.Security.Permissions;
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using System.Threading;
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/// <devdoc>
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/// <para>Provides a type converter to convert <see cref='System.TimeSpan'/>
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/// objects to and from various
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/// other representations.</para>
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/// </devdoc>
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[HostProtection(SharedState = true)]
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public class TimeSpanConverter : TypeConverter
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{
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/// <devdoc>
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/// <para>Gets a value indicating whether this converter can
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/// convert an object in the given source type to a <see cref='System.TimeSpan'/> object using the
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/// specified context.</para>
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/// </devdoc>
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public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
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if (sourceType == typeof(string)) {
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return true;
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}
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return base.CanConvertFrom(context, sourceType);
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}
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/// <devdoc>
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/// <para>Gets a value indicating whether this converter can
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/// convert an object to the given destination type using the context.</para>
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/// </devdoc>
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public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
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if (destinationType == typeof(InstanceDescriptor)) {
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return true;
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}
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return base.CanConvertTo(context, destinationType);
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}
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/// <devdoc>
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/// <para>Converts the given object to a <see cref='System.TimeSpan'/>
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/// object.</para>
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/// </devdoc>
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public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
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if (value is string) {
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string text = ((string)value).Trim();
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try {
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return TimeSpan.Parse(text, culture);
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}
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catch (FormatException e) {
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throw new FormatException(SR.GetString(SR.ConvertInvalidPrimitive, (string)value, "TimeSpan"), e);
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}
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}
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return base.ConvertFrom(context, culture, value);
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}
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/// <devdoc>
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/// Converts the given object to another type. The most common types to convert
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/// are to and from a string object. The default implementation will make a call
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/// to ToString on the object if the object is valid and if the destination
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/// type is string. If this cannot convert to the desitnation type, this will
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/// throw a NotSupportedException.
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/// </devdoc>
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public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
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if (destinationType == null) {
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throw new ArgumentNullException("destinationType");
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}
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if (destinationType == typeof(InstanceDescriptor) && value is TimeSpan) {
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MethodInfo method = typeof(TimeSpan).GetMethod("Parse", new Type[] {typeof(string)});
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if (method != null) {
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return new InstanceDescriptor(method, new object[] {value.ToString()});
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}
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}
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return base.ConvertTo(context, culture, value, destinationType);
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}
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}
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}
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