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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.ComponentModel.Design.Serialization;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Reflection;
namespace System.ComponentModel
{
/// <summary>
/// Provides a type converter to convert <see cref='decimal'/>
/// objects to and from various other representations.
/// </summary>
public class DecimalConverter : BaseNumberConverter
{
/// <summary>
/// Determines whether this editor will attempt to convert hex (0x or #) strings
/// </summary>
internal override bool AllowHex => false;
/// <summary>
/// The Type this converter is targeting (e.g. Int16, UInt32, etc.)
/// </summary>
internal override Type TargetType => typeof(decimal);
/// <summary>
/// Gets a value indicating whether this converter can convert an
/// object to the given destination type using the context.
/// </summary>
public override bool CanConvertTo(ITypeDescriptorContext? context, [NotNullWhen(true)] Type? destinationType)
{
return destinationType == typeof(InstanceDescriptor) || base.CanConvertTo(context, destinationType);
}
/// <summary>
/// Converts the given object to another type. The most common types to convert
/// are to and from a string object. The default implementation will make a call
/// to ToString on the object if the object is valid and if the destination
/// type is string. If this cannot convert to the destination type, this will
/// throw a NotSupportedException.
/// </summary>
public override object? ConvertTo(ITypeDescriptorContext? context, CultureInfo? culture, object? value, Type destinationType)
{
if (destinationType == typeof(InstanceDescriptor) && value is decimal decimalValue)
{
ConstructorInfo? ctor = typeof(decimal).GetConstructor(new Type[] { typeof(int[]) });
Debug.Assert(ctor != null, "Expected constructor to exist.");
return new InstanceDescriptor(ctor, new object[] { decimal.GetBits(decimalValue) });
}
return base.ConvertTo(context, culture, value, destinationType);
}
/// <summary>
/// Convert the given value to a string using the given radix
/// </summary>
internal override object FromString(string value, int radix)
{
return Convert.ToDecimal(value, CultureInfo.CurrentCulture);
}
/// <summary>
/// Convert the given value to a string using the given formatInfo
/// </summary>
internal override object FromString(string value, NumberFormatInfo? formatInfo)
{
return decimal.Parse(value, NumberStyles.Float, formatInfo);
}
/// <summary>
/// Convert the given value from a string using the given formatInfo
/// </summary>
internal override string ToString(object value, NumberFormatInfo? formatInfo)
{
return ((decimal)value).ToString("G", formatInfo);
}
}
}
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