C# 模型包含字段而不将其添加到数据库中吗？
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Have model contain field without adding it to the database?
提问by Zebedee
In my Asp.NET MVC4 application I want to add a field to my model without adding it to the database.
在我的 Asp.NET MVC4 应用程序中，我想将一个字段添加到我的模型中而不将它添加到数据库中。
Sort of a field that only lives in c# instances of the model but not in the database itself.
某种仅存在于模型的 c# 实例中而不存在于数据库本身中的字段。
Is there any annotation or other way to exclude the field from the database itself?
是否有任何注释或其他方法可以从数据库本身中排除该字段？
I mean an object I can read and write in runtime which the database has no knowledge of.
我的意思是我可以在运行时读取和写入数据库不知道的对象。
采纳答案by haim770
Just decorate your field/property with [NotMapped].
只需用[NotMapped].
For example:
例如：
public class MyModel
{
public int Id { get; set; }
public string Name { get; set; }
[NotMapped]
public string Type { get; set; }
}
回答by Przemys?aw Kalita
That depends what framework you are using to access your data. I assume it's Entity Framework. Well, you can create partial class with the property that you wanty to not be mapped to your database.
这取决于您用于访问数据的框架。我假设它是实体框架。好吧，您可以使用不希望映射到数据库的属性创建分部类。
something like
就像是
public class Class1
{
string Text { get; set; }
int Number { get; set; }
}
public partial class Class1
{
bool IsSomething { get; set; }
}
but that is not advised. More: Entity Framework: add property that don't map to database
但不建议这样做。更多： 实体框架：添加不映射到数据库的属性
Or if you're using Code First: Ignoring a class property in Entity Framework 4.1 Code First
或者，如果您使用的是 Code First: Ignoring a class property in Entity Framework 4.1 Code First
