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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;
using System.Globalization;
namespace System.Windows.Forms;
/// <summary>
/// ImageIndexConverter is a class that can be used to convert
/// image index values one data type to another.
/// </summary>
public class TreeViewImageKeyConverter : ImageKeyConverter
{
/// <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)
{
ArgumentNullException.ThrowIfNull(destinationType);
if (destinationType == typeof(string) && (value is null))
{
return SR.toStringDefault;
}
else
{
if (value is string strValue && (strValue.Length == 0))
{
return SR.toStringDefault;
}
}
return base.ConvertTo(context, culture, value, destinationType);
}
}
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