MongoDB .NET: Mapping inherited generic property

Question

I have a generic class Parameter with a generic property Value:

abstract class Parameter<T> {
    public T Value { get; set; }
}

StringParameter class inherits the Parameter class:

class StringParameter : Parameter<string> {
    //...
}

Is it possible to properly map the StringParameter class so that it contains the generic Value property?

When trying to map the StringParameter class with the code below (and various other approaches) the best I could do is get an exception with the message: "The memberInfo argument must be for class StringParameter, but was for class Parameter`1."

BsonClassMap.RegisterClassMap<StringParameter>(cm => {
    cm.AutoMap();
    cm.MapMember(typeof(StringParameter).GetRuntimeProperty("Value"));
});

bklaric · Accepted Answer · 2016-08-08 10:59:22Z

2

Mapping the Parameter class with the specified type parameter for every subclass that inherits it and then automapping each subclass seems to have done the trick.

BsonClassMap.RegisterClassMap<Parameter<string>>(cm => {
    cm.AutoMap();
    cm.MapProperty("Value");
});
BsonClassMap.RegisterClassMap<Parameter<DateTime>>(cm => {
    cm.AutoMap();
    cm.MapProperty("Value");
});
BsonClassMap.RegisterClassMap<Parameter<int>>(cm => {
    cm.AutoMap();
    cm.MapProperty("Value");
});
BsonClassMap.RegisterClassMap<Parameter<decimal>>(cm => {
    cm.AutoMap();
    cm.MapProperty("Value");
});

BsonClassMap.RegisterClassMap<StringParameter>();
BsonClassMap.RegisterClassMap<DateParameter>();
BsonClassMap.RegisterClassMap<IntegerParameter>();
BsonClassMap.RegisterClassMap<DecimalParameter>();

Note that this maps all the Parameter classes into a single collection with appropriate discriminators.

edited Aug 8, 2016 at 10:59

answered Aug 3, 2016 at 11:30

bklaric

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