87 lines
3.6 KiB
C#
87 lines
3.6 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="GuidConverter.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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/// <devdoc>
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/// <para>Provides a
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/// type converter to convert globally unique identifier 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 GuidConverter : TypeConverter {
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/// <devdoc>
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/// <para>Gets a value indicating whether this
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/// converter can convert an object in the given source type to a globally unique identifier object
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/// using the 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
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/// the given object to a globally unique identifier 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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return new Guid(text);
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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 Guid) {
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ConstructorInfo ctor = typeof(Guid).GetConstructor(new Type[] {typeof(string)});
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if (ctor != null) {
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return new InstanceDescriptor(ctor, 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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