public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string stringValue)
{
TypeConverterHelper currentHelper = helper;
if (currentHelper == null)
{
IDestinationTypeProvider targetService = context.GetService(typeof(IDestinationTypeProvider)) as IDestinationTypeProvider;
Type targetType = targetService.GetDestinationType();
if (!this.helpers.Value.TryGetValue(targetType, out currentHelper))
{
currentHelper = GetTypeConverterHelper(targetType, this.baseType, this.helperType);
if (!this.helpers.Value.TryAdd(targetType, currentHelper))
{
if (!this.helpers.Value.TryGetValue(targetType, out currentHelper))
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.TypeConverterHelperCacheAddFailed(targetType)));
}
}
}
}
object result = currentHelper.UntypedConvertFromString(stringValue, context);
return(result);
}
return(base.ConvertFrom(context, culture, value));
}