如何更新对象值(基于当前先前的模式)?

当前的解决方案是使用名为 CopyMe 然后使用反射进行复制。

[DelimitedRecord(",") ]
[IgnoreFirst(1)] 
public class Product
{

    [CopyMe()] public int ID { get; set; }
    [CopyMe()] public string Description { get; set; }

    [FieldConverter(ConverterKind.Decimal)]
    public decimal Val{ get; set; }
}

后读方法看起来是这样的…

public void AfterRead(AfterReadEventArgs<RawVolsDataPoints> e)
{
    var record = (Product)e.Record;

    if (PreviousRecord == null)
    {
        PreviousRecord = new Product();
         PreviousRecord = record;
    }

    if (String.IsNullOrEmpty(record.ID)) // null value indicates a new row
    {
        var ttype = typeof(Product);
        var fields = ttype.GetFields();

        var fieldsToCopy = fields.Where(field =>
            field.GetCustomAttributes(typeof(CopyMeAttribute), true).Any());

        foreach (var item in fieldsToCopy)
        {
            var prevvalue = item.GetValue(PreviousRecord);
            item.SetValue(record, prevvalue);
         }
    }
}