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//------------------------------------------------------------------------------
// <copyright file="CharConverter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
*/
namespace System.ComponentModel {
using Microsoft.Win32;
using System.ComponentModel;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.Serialization.Formatters;
using System.Runtime.Remoting;
using System.Runtime.InteropServices;
using System.Security.Permissions;
/// <devdoc>
/// <para>Provides
/// a type converter to convert Unicode
/// character objects to and from various other representations.</para>
/// </devdoc>
[HostProtection(SharedState = true)]
public class CharConverter : TypeConverter {
/// <devdoc>
/// <para>Gets a value indicating whether this converter can
/// convert an object in the given source type to a Unicode character object using
/// the specified context.</para>
/// </devdoc>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
if (sourceType == typeof(string)) {
return true;
}
return base.CanConvertFrom(context, sourceType);
}
/// <devdoc>
/// Converts the given object to another type.
/// </devdoc>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == typeof(string) && value is char)
{
if ((char)value == (char)0)
{
return "";
}
}
return base.ConvertTo(context, culture, value, destinationType);
}
/// <devdoc>
/// <para>Converts the given object to a Unicode character object.</para>
/// </devdoc>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
if (value is string) {
string text = (string)value;
if (text.Length > 1) {
text = text.Trim();
}
if (text != null && text.Length > 0) {
if (text.Length != 1) {
throw new FormatException(SR.GetString(SR.ConvertInvalidPrimitive, text, "Char"));
}
return text[0];
}
return '\0';
}
return base.ConvertFrom(context, culture, value);
}
}
}
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