我正在使用AutoMapper进行对象映射。有时源值为null所以我想用""替换它。而不是在数据库中放置NULL。 源对象有许多可以为空的数据类型,如Date,Decimal和Int。 目前我正在使用
public class Invoice
{
public Guid Id { get; set; }
public string Number { get; set; }
public Contact Contact { get; set; }
public InvoiceType Type { get; set; }
public InvoiceStatus Status { get; set; }
public LineAmountType LineAmountTypes { get; set; }
public DateTime? Date { get; set; }
public DateTime? DueDate { get; set; }
public DateTime? ExpectedPaymentDate { get; set; }
public DateTime? PlannedPaymentDate { get; set; }
public decimal? SubTotal { get; set; }
public decimal? TotalTax { get; set; }
public decimal? Total { get; set; }
public decimal? TotalDiscount { get; set;
public decimal? CurrencyRate { get; set; }
public DateTime? FullyPaidOnDate { get; set; }
public decimal? AmountDue { get; set; }
public decimal? AmountPaid { get; set; }
public decimal? AmountCredited { get; set; }
}
public partial class TempInvoice
{
public int RowId { get; set; }
public System.Guid InvoiceID { get; set; }
public string InvoiceNumber { get; set; }
public Nullable<System.Guid> ContactID { get; set; }
public string Type { get; set; }
public string Status { get; set; }
public string LineAmountType { get; set; }
public Nullable<System.DateTime> InvoiceDate { get; set; }
public Nullable<System.DateTime> DueDate { get; set; }
public Nullable<System.DateTime> ExpectedPaymentDate { get; set; }
public Nullable<System.DateTime> PlannedPaymentDate { get; set; }
public Nullable<decimal> SubTotal { get; set; }
public Nullable<decimal> TotalTax { get; set; }
public Nullable<decimal> Total { get; set; }
public Nullable<decimal> TotalDiscount { get; set; }
public Nullable<decimal> CurrencyRate { get; set; }
public Nullable<System.DateTime> FullyPaidOnDate { get; set; }
public Nullable<decimal> AmountDue { get; set; }
public Nullable<decimal> AmountCredited { get; set; }
}
public class InvoiceMapper : Profile
{
public InvoiceMapper()
{
CreateMap<Invoice, TempInvoice>()
.ForMember(des => des.PaymentID, map => map.MapFrom(src => src.Id))
.ForMember(des => des.InvoiceID, map => map.MapFrom(src => src.Invoice.Id))
.ForMember(des => des.PaymentDate, map => map.MapFrom(src => src.Date))
.ForAllMembers(src => src.NullSubstitute(""))//this doesn't work
;
}
}
但是我收到了上述错误。 有没有办法可以排除数据时间类型并将int或decimal设置为0,将字符串设置为&#34;&#34; ?是否有可用于所有数据类型的通用方法? 感谢
答案 0 :(得分:0)
您可以使用ResolveUsing的解析器函数,使用您自己的自定义映射函数,如果目标是字符串,则返回空字符串,否则返回null。
例如:
private static object MyMapperResolver(object source, bool returnEmptyString = true) {
return source ?? (returnEmptyString ? "" : source);
}
public static IMapper InitMappings() {
Mapper.Initialize(cfg => {
cfg.CreateMap<Invoice, TempInvoice>()
.ForMember(des => des.PaymentID, map => map.ResolveUsing(src => MyMapperResolver(src.Id)))
.ForMember(des => des.InvoiceID, map => map.ResolveUsing(src => MyMapperResolver(src.Invoice.Id)))
.ForMember(des => des.PaymentDate, map => map.ResolveUsing(src => MyMapperResolver(src.Date, false)))
;
});
return Mapper.Instance;
}