c# - AutoMapper - 将空字符串映射到 int

Question

我正在尝试使用 AutoMapper 转换 SourceThing至 DestinationThing

public class SourceThing
{
    public string Length;
    public string Width;
    public string Make;
}

public class DestinationThing
{
    public int Length;
    public int Width;
    public string Make;
}

CreateMap<SourceThing, DestinationThing>();

_mapper.Map<DestinationThing>(sourceObj);

我遇到的问题是当我的 sourceObj是以下内容:

{
  "Length": "",
  "Width": "2",
  "Make": "3"
}

我得到一个错误:FormatException: Input string was not in a correct format. AutoMapperMappingException: Error mapping types. Property: Length

是否需要配置某些内容才能让 AutoMapper 成功映射它？

Answer 1

你需要Custom Value Resolvers :

CreateMap<SourceThing, DestinationThing>()
    .ForMember(dest => dest.Length, 
        opt => opt.MapFrom(src => string.IsNullOrWhiteSpace(src.Length)
            ? default(int)
            : int.Parse(src.Length))