/// <summary>
/// Convert Min and Max values to string if step type is set to one of the DateTime type
/// </summary>
/// <param name="context">Descriptor context.</param>
/// <param name="culture">Culture information.</param>
/// <param name="value">Value to convert.</param>
/// <param name="destinationType">Convertion destination type.</param>
/// <returns>Converted object.</returns>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (context != null && context.Instance != null && context.Instance is Axis)
{
Axis axis = (Axis)context.Instance;
if (destinationType == typeof(string))
{
string strValue = DoubleDateNanValueConverter.ConvertDateTimeToString(
(double)value,
axis.GetAxisValuesType(),
axis.InternalIntervalType);
if (strValue != null)
{
return(strValue);
}
}
}
return(base.ConvertTo(context, culture, value, destinationType));
}
/// <summary>
/// Convert Min and Max values from string if step type is set to one of the DateTime type
/// </summary>
/// <param name="context">Descriptor context.</param>
/// <param name="culture">Culture information.</param>
/// <param name="value">Value to convert from.</param>
/// <returns>Converted object.</returns>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
object result = null;
bool convertFromDate = false;
string stringValue = value as string;
// If context interface provided check if we are dealing with DateTime values
if (context != null && context.Instance != null && context.Instance is Axis)
{
Axis axis = (Axis)context.Instance;
if (stringValue != null)
{
if (axis.InternalIntervalType == DateTimeIntervalType.Auto)
{
if (axis.GetAxisValuesType() == ChartValueType.DateTime ||
axis.GetAxisValuesType() == ChartValueType.Date ||
axis.GetAxisValuesType() == ChartValueType.Time ||
axis.GetAxisValuesType() == ChartValueType.DateTimeOffset)
{
convertFromDate = true;
}
}
else
{
if (axis.InternalIntervalType != DateTimeIntervalType.Number)
{
convertFromDate = true;
}
}
}
}
// Try to convert from double string
try
{
result = base.ConvertFrom(context, culture, value);
}
catch (ArgumentException)
{
result = null;
}
catch (NotSupportedException)
{
result = null;
}
// Try to convert from date/time string
if (stringValue != null && (convertFromDate || result == null))
{
DateTime valueAsDate;
bool parseSucceed = DateTime.TryParse(stringValue, CultureInfo.CurrentCulture, DateTimeStyles.None, out valueAsDate);
if (parseSucceed)
{
return(valueAsDate.ToOADate());
}
}
// Call base converter
return(base.ConvertFrom(context, culture, value));
}