87 lines
3.3 KiB
C#
87 lines
3.3 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="BooleanConverter.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.Collections;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Globalization;
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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 type converter to convert
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/// Boolean objects to and from various other representations.</para>
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/// </devdoc>
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[HostProtection(SharedState = true)]
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public class BooleanConverter : TypeConverter {
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private static volatile StandardValuesCollection values;
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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 Boolean 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>Converts the given value
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/// object to a Boolean 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 Boolean.Parse(text);
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}
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catch (FormatException e) {
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throw new FormatException(SR.GetString(SR.ConvertInvalidPrimitive, (string)value, "Boolean"), 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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/// <para>Gets a collection of standard values
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/// for the Boolean data type.</para>
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/// </devdoc>
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public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
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if (values == null) {
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values = new StandardValuesCollection(new object[] {true, false});
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}
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return values;
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}
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/// <devdoc>
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/// <para>Gets a value indicating whether the list of standard values returned from
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/// <see cref='System.ComponentModel.BooleanConverter.GetStandardValues'/> is an exclusive list. </para>
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/// </devdoc>
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public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) {
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return true;
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}
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/// <devdoc>
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/// <para>Gets a value indicating whether this object supports a standard set of values
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/// that can be picked from a list.</para>
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/// </devdoc>
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public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
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return true;
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}
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}
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}
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