79 lines
2.7 KiB
C#
79 lines
2.7 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="CharConverter.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;
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using System.Diagnostics;
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using System.Globalization;
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using System.Runtime.Serialization.Formatters;
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using System.Runtime.Remoting;
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using System.Runtime.InteropServices;
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using System.Security.Permissions;
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/// <devdoc>
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/// <para>Provides
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/// a type converter to convert Unicode
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/// character 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 CharConverter : TypeConverter {
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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 Unicode character object using
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/// the 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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/// Converts the given object to another type.
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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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{
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if (destinationType == typeof(string) && value is char)
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{
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if ((char)value == (char)0)
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{
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return "";
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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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/// <devdoc>
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/// <para>Converts the given object to a Unicode character 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;
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if (text.Length > 1) {
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text = text.Trim();
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}
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if (text != null && text.Length > 0) {
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if (text.Length != 1) {
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throw new FormatException(SR.GetString(SR.ConvertInvalidPrimitive, text, "Char"));
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}
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return text[0];
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}
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return '\0';
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}
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return base.ConvertFrom(context, culture, value);
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}
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}
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}
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