/// <summary>
/// Converts the given value object to the destination type.
/// </summary>
public override object?ConvertTo(ITypeDescriptorContext?context, CultureInfo?culture, object?value, Type destinationType)
{
ArgumentNullException.ThrowIfNull(destinationType);
if (destinationType == UnderlyingType && value != null && NullableType.IsInstanceOfType(value))
{
return(value);
}
else if (destinationType == typeof(InstanceDescriptor))
{
ConstructorInfo ci = (ConstructorInfo)NullableType.GetMemberWithSameMetadataDefinitionAs(s_nullableConstructor);
Debug.Assert(ci != null, "Couldn't find constructor");
return(new InstanceDescriptor(ci, new object?[] { value }, true));
}
else if (value == null)
{
// Handle our own nulls here
if (destinationType == typeof(string))
{
return(string.Empty);
}
}
else if (UnderlyingTypeConverter != null)
{
return(UnderlyingTypeConverter.ConvertTo(context, culture, value, destinationType));
}
return(base.ConvertTo(context, culture, value, destinationType));
}
/// <summary>
/// Converts the given value object to the destination type.
/// </summary>
public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
{
if (destinationType == null)
{
throw new ArgumentNullException(nameof(destinationType));
}
if (destinationType == UnderlyingType && value != null && NullableType.IsInstanceOfType(value))
{
return(value);
}
else if (destinationType == typeof(InstanceDescriptor))
{
ConstructorInfo ci = NullableType.GetConstructor(new Type[] { UnderlyingType });
Debug.Assert(ci != null, "Couldn't find constructor");
return(new InstanceDescriptor(ci, new object[] { value }, true));
}
else if (value == null)
{
// Handle our own nulls here
if (destinationType == typeof(string))
{
return(string.Empty);
}
}
else if (UnderlyingTypeConverter != null)
{
return(UnderlyingTypeConverter.ConvertTo(context, culture, value, destinationType));
}
return(base.ConvertTo(context, culture, value, destinationType));
}
/// <summary>
/// Converts the given value object to the destination type.
/// </summary>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == null)
{
throw new ArgumentNullException(nameof(destinationType));
}
if (destinationType == UnderlyingType && value != null && NullableType.IsInstanceOfType(value))
{
return(value);
}
else if (value == null)
{
// Handle our own nulls here
if (destinationType == typeof(string))
{
return(string.Empty);
}
}
else if (UnderlyingTypeConverter != null)
{
return(UnderlyingTypeConverter.ConvertTo(context, culture, value, destinationType));
}
return(base.ConvertTo(context, culture, value, destinationType));
}
public override object ConvertTo(CultureInfo culture, string format, object value, Type to)
{
if (to == UnderlyingType && NullableType.IsInstanceOfType(value))
{
return(value);
}
if (value == null)
{
if (to == typeof(string))
{
return(string.Empty);
}
}
return(UnderlyingTypeConverter.ConvertTo(culture, format, value, to));
}
