AutoMapper Custom Mappings

Question

Lets assume I have the following classes

public class foo
{
    public string Value;
}


public class bar
{
    public string Value1;
    public string Value2;
}

Now I want to configure Auto Map, to Map Value1 to Value if Value1 starts with "A", but otherwise I want to map Value2 to Value.

This is what I have so far:

Mapper
    .CreateMap<foo,bar>()
    .ForMember(t => t.Value, 
        o => 
            {
                o.Condition(s => 
                    s.Value1.StartsWith("A"));
                o.MapFrom(s => s.Value1);
                  <<***I want to throw Exception here***>>
            })

However I know how can I give value 1 or value 2 on Conditional basis but don't know how to put some custom code , call a function or throw an Exception

Please Guide.

D Stanley · Accepted Answer · 2021-02-19 13:40:59Z

21

You can pass a lambda to ResolveUsing:

.ForMember(f => f.Value, o => o.ResolveUsing(b =>
    {
        if (b.Value1.StartsWith("A"))
        {
            return b.Value1;
        }
        return b.Value2;
    }
));

edited Feb 19, 2021 at 13:40

answered Nov 25, 2013 at 15:11

D Stanley

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6 Comments

N.K Over a year ago

I don't want to give the reference to memory so I cant use ResolveUsing , is there any option to use the same thing with MapFrom ?

D Stanley Over a year ago

What do you mean by "give the reference to memory"?

N.K Over a year ago

ResolveUsing uses the Reference where as MapFrom uses the Value of the property being mapped.

D Stanley Over a year ago

I'm still not sure I understand - MapFrom is designed to map straight from properties (it still pulls the value from the reference to the object being mapped from), while ResolveUsing is designed to allow virtually any mapping logic.

Razor23 Donetsk Over a year ago

there is a mistake in "if (b.Value1.StartsWith("A"));)". (excessive symbols in the end)

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