如何在AutoMapper中合並兩個對象？

Question

給定以下內容：

public class NameValueContainer
{
    public string Name { get; set; }
    public IList<string> Values { get; set; }
}

var first = new NameValueContainer
{
    Name = "First",
    Values = new List<string> { "Value1", "Value2" }
}

var second = new NameValueContainer
{
    Name = "Second",
    Values = new List<string> { "Value3" }
}

使用AutoMapper，我如何first合並second以便剩下我？

名稱：“第一名”

值：“ Value1”，“ Value2”，“ Value3”

Answer 1

正如評論所指出的那樣，將其與AutoMapper捆綁在一起實際上沒有任何意義。 最簡單的方法是使用Linq：

var merged = new NameValueContainer
{
    Name = first.Name,
    Values = first.Values.Union(second.Values).ToList()
};
//merged.Values: "Value1", "Value2", "Value3"

Answer 2

好吧，我知道這沒有什么意義，但是在像這樣的自動映射器中是可能的。

public class NameValueMerger : ITypeConverter<IList<string>, IList<string>>
{
    public IList<string> Convert(ResolutionContext context)
    {
        var source = context.SourceValue as IList<string>;
        var destination = context.DestinationValue as IList<string>;
        if (source != null &&
            destination != null)
        {
            return destination.Concat(source).ToList();
        }
        throw new ArgumentException("Types not compatible for converter.");
    }
}

public class NameValueContainer
{
    public string Name { get; set; }
    public IList<string> Values { get; set; }
}

internal class Program
{
    static Program()
    {
        Mapper.CreateMap<NameValueContainer, NameValueContainer>();
        Mapper.CreateMap<IList<string>, IList<string>>().ConvertUsing(new NameValueMerger());            
    }

    private static void Main(string[] args)
    {
        var first = new NameValueContainer { Name = "First", Values = new List<string> { "Value1", "Value2" } };
        var second = new NameValueContainer { Name = "Second", Values = new List<string> { "Value3" } };

        var result = Mapper.Map(second, first);

        Console.Write("Value : " + string.Join(", ", result.Values));
        Console.WriteLine();
    }
}

此輸出將是

Value : Value1, Value2, Value3
Press any key to continue . . .

只是說-因為您可能並不意味着您應該:)