public class FluentBuilder : IFluentBuilder
{
    public FluentBuilder()
    {
        this.Convention = new TestExportConvention();
    }
 
    private ITestExportConvention Convention { get; set; }
 
    public IFluentBuilder Export<T>(Expression<Func<T, object>> expression)
    {
        var member =
            GetMemberFromExpression(expression);
 
        Convention.Member = t => new[] { member };
 
        return this;
    }
 
    public IFluentBuilder ExportAllPublicMembers()
    {
        this.Convention.Member = t => t.GetMembers(BindingFlags.Instance | BindingFlags.Public);
        return this;
    }
}