当我首先将EF与数据库一起使用时，如何在asp.net mvc3中添加Validation内容?

问题描述

我的mvc3应用程序有问题，我需要创建一些Validation东西.但是我没有普通的模型类，因为我已经将EF与数据库优先方法结合使用了.

i have a problem with my mvc3 application, i need to create some Validation stuff. but i dont have a normal model class because i have used EF with the database first approach.

我不能只打开类并编写如下内容:

i can not just open the class and write something like:

[Required]
[StringLength(10)]

如何解决这个问题?

推荐答案

您可以使用 MetadataType属性.因此，让我们假设EF向您吐出了您无法修改的以下类:

You could use the MetadataType attribute. So let's suppose that EF spit at your face the following class which you cannot modify:

public partial class Foo
{
    public string Bar { get; set; }
}

现在您可以扩展它，因为它是部分类:

Now you could extend it since it is a partial class:

[MetadataType(typeof(FooMetadata))]
public partial class Foo
{
}

，然后定义元数据:

public class FooMetadata
{
    [Required]
    [StringLength(10)]
    public string Foo { get; set; }
}

或者，直接丢弃数据注释，并使用真实的验证框架，例如 FluentValidation.NET (我将使用并强烈建议)，允许您以流畅的方式在模型上表达复杂的验证规则，并具有与ASP.NET MVC完美集成，并且还允许您优雅地单独测试验证逻辑.

Or, simply throw data annotations away and use a real validation framework such as FluentValidation.NET (which I use and strongly recommend) allowing you to express complex validation rules on your models in a fluent manner, has an excellent integration with ASP.NET MVC and also allows you to elegantly unit test your vaildation logic in isolation.

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