Map readonly fields with Automapper

I have two identical classes in different namespaces:

namespace ClassLibrary1
class Class1
{
    public readonly int field1;
    public Class1(int value) { field1 = value; }
}

And the same class definition in namespace ClassLibrary2 .

When I try to use AutoMapper, I get this exception:

Expression must be writeable Parameter name: left

This is the code of AutoMapper:

Mapper.CreateMap<ClassLibrary1.Class1, ClassLibrary2.Class1>();
var result = Mapper.Map<ClassLibrary2.Class1>(class1);

But if I try this AutoMapper Exclude Fields it doesn't work, using this:

Mapper.CreateMap<ClassLibrary1.Class1, ClassLibrary2.Class1>()
    .ForMember(a => a.field1, a => a.Ignore());

For sure it works to change it to a property with public get and private set (like in Automapper ignore readonly properties), but I want to prevent a future developer of setting the value after constructor.

Is there any way of solving this using AutoMapper?

---

如果您想在构造函数中设置属性，请使用.ConstructUsing ，然后忽略该字段：

Mapper.CreateMap<ClassLibrary1.Class1, ClassLibrary2.Class1>()
    .ConstructUsing(cls1 => new ClassLibrary2.Class1(cls1.field1))
    .ForMember(a => a.field1, a => a.Ignore());

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