Question

我的Domain-project中有这个类：

public class Person: EntityObject
{
    public int ID { get; set; }
    public string Name { get; set; }
}

我的DataAccess项目中有一个存储库：

public class PersonRepository
{
    DatabaseContext DbContext { get; }

    public PersonRepository(DatabaseContext dbContext)
    {
        this.DbContext = dbContext;
    }

    public virtual IEnumerable<Person> GetAll()
    {
        return DbContext.Persons.ToList();
    }

    public virtual void SaveChanges(Person persoon)
    {

        // configure auditing
        DbContext.Audit<Person, PersonHistory>(
            (record, action) => new PersonHistory()
            {
                ID = record.Field<Person, int>(f => f.ID),
                Name = record.Field<Person, string>(f => f.Name),
                CreatedDate = DateTime.Now,
                CreatedBy = "Simon",
                ChangedBy = "Simon",
                ChangedDate = DateTime.Now,
                ChangeType = action.ToString()
            },
            (ph) => DbContext.PersonHistory.Add(ph));

        DbContext.SaveChanges();
    }
}

我的dbcontext也在DataAccess项目中，如下所示：

public class DatabaseContext : DbContext
{
    public DatabaseContext()
    {
        Database.SetInitializer<DatabaseContext>(null);
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
    }

    public virtual DbSet<Person> Persons { get; set; }

    public virtual DbSet<PersonHistory> PersonHistory { get; set; }
}

我添加了一个扩展方法来提供审计跟踪。

public static class DbContextExtension
{
    public static void Audit<TFromType, TToType>(this DbContext context,Func<IDataRecord, EntityState, TToType> mapping,Action<TToType> addToContext)
    {
        ObjectContext ctx = ((IObjectContextAdapter)context).ObjectContext;
        ctx.SavingChanges += new EventHandler((o, e) => CreateAuditRecord<TFromType, TToType>(ctx, mapping, addToContext));
    }

    private static void CreateAuditRecord<TFromType, TToType>(
       ObjectContext context,
       Func<IDataRecord, EntityState, TToType> mapping,
       Action<TToType> addToContext)
    {
        // get a list of changes to audit
        IEnumerable<ObjectStateEntry> entities =
            from e in context.ObjectStateManager.GetObjectStateEntries(
                EntityState.Modified | EntityState.Deleted)
            where
                e.IsRelationship == false &&
                typeof(TFromType).IsAssignableFrom(e.Entity.GetType())
            select e;

        foreach (ObjectStateEntry item in entities)
        {
            // map the changed item to an audit record entry
            TToType auditRecord = mapping(item.OriginalValues, item.State);
            // and add it to the object context so that it is persisted for us
            addToContext(auditRecord);
        }
    }

    public static T Field<E, T>(this IDataRecord record, Expression<Func<E, T>> propertySelector)
        where E : EntityObject
    {
        MemberExpression memberExpression = propertySelector.Body as MemberExpression;
        MemberInfo propertyInfo = memberExpression.Member;

        int fieldIndex = record.GetOrdinal(propertyInfo.Name);
        return Field<T>(record, fieldIndex);
    }

    public static T Field<T>(this IDataRecord record, int ordinal)
    {
        object value = record.IsDBNull(ordinal) ? null : record.GetValue(ordinal);
        return (T)value;
    }
}

现在，当我运行我的应用程序时，我收到以下错误：

类型＆＃39; System.InvalidOperationException＆＃39;的例外情况发生在   EntityFramework.dll但未在用户代码中处理

其他信息：类型＆＃39; CoBen.Dossier.Domain.Person＆＃39;不是   映射。检查是否未使用明确排除类型   Ignore方法或NotMappedAttribute数据注释。验证   类型被定义为一个类，不是原始的或通用的，并且确实如此   不是从EntityObject继承。

我做错了什么？

类型未映射的问题

0 个答案: