我首先使用ASP.NET MVC 3和实体框架代码CTP 5.我想知道是否可以添加未映射到表列的其他属性？
我有一个新闻类,它定义如下：
public class News : Entity
{
public int NewsId { get; set; }
public string Title { get; set; }
public string Body { get; set; }
public bool Active { get; set; }
}
我的数据库上下文类：
public class MyContext : DbContext
{
public DbSet<News> Newses { get; set; }
}
在实体类中,我有一个定义为的属性：
public IList<RuleViolation> RuleViolations { get; set; }
我还没有对这部分进行编码,但我希望在验证对象时将所有破坏的规则添加到此列表中.我得到的错误是：
One or more validation errors were detected during model generation:
System.Data.Edm.EdmEntityType: : EntityType 'RuleViolation' has no key defined. Define the key for this EntityType.
System.Data.Edm.EdmEntitySet: EntityType: The EntitySet RuleViolations is based on type RuleViolation that has no keys defined.
这是我的重叠代码：
public News FindById(int newsId)
{
return context.Database.sqlQuery<News>("News_FindById @NewsId",new sqlParameter("NewsId",newsId)).FirstOrDefault();
}
更新2011-03-02：
这是我的实体类：
public class Entity
{
public IList<RuleViolation> RuleViolations { get; set; }
public bool Validate()
{
// Still needs to be coded
bool isValid = true;
return isValid;
}
}
这是我的RuleViolation类：
public class RuleViolation
{
public RuleViolation(string parameterName,string errorMessage)
{
ParameterName = parameterName;
ErrorMessage = errorMessage;
}
public string ParameterName { get; set; }
public string ErrorMessage { get; set; }
}
这是我的上下文类：
public class MyContext : DbContext
{
public DbSet<News> Newses { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<News>().Ignore(n => n.RuleViolations);
}
}
解决方法
您可以通过向MyContext类的OnModelCreating方法添加忽略规则来使用Fluent API忽略该类型
public class MyContext : DbContext {
public DbSet<News> Newses { get; set; }
protected override void OnModelCreating(ModelBuilder builder) {
builder.Ignore<RuleViolation>()
}
}
public class Enitity {
[NotMapped]
public IList<RuleViolation> RuleViolations { get; set; }
//other properties here
}
然后实体框架将忽略该属性.
