.Ignore() for interface pairs throws ArgumentException

Suppose we have two interfaces which are identical except that one has a field the other does not.

public interface Interface1
{
    public string Inter { get; set; }
    
    public string Ignore { get; }
}

public interface Interface2
{
    public string Inter { get; set; }
}

When creating a mapping config we would simply ignore this field as:

config.NewConfig<Interface1, Interface2>() 
   .TwoWays()
   .Ignore(dest => dest.Ignore);

However this throws the error:
"System.ArgumentException : Incorrect number of arguments for constructor"

The only fix as far as i can tell is to explicitly map this property to something E.G:

string temp = null;
config.NewConfig<Interface1, Interface2>()
   .TwoWays()
   .Map(dest => dest.Ignore, src => temp);

Or to hardcode what class to use when this mapping pair is hit:

config.NewConfig<Interface1, Interface2>()
   .Twoways()
   .ConstructUsing(src => new DerivedClass());

Both of these fixes are suboptimal, are there any other way to get around this issue?

@luczito

Hello @luczito I think I found the place where this error occurs.
But are you sure about the specified configuration or the description of the interfaces provided?
On this basis, I can set the condition you specified only in the reverse configuration.

  TypeAdapterConfig<Interface2, Interface1>
      .NewConfig()
      .TwoWays()
      .Ignore(dest => dest.Ignore);

(And it doesn't make much sense. Since the value won't be transferred anyway. If this field is not in the source).

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.Ignore() for interface pairs throws ArgumentException #723

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.Ignore() for interface pairs throws ArgumentException #723

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DocSvartz commented on Jan 5, 2025

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