问题描述
[EmailAddress] 和 [DataType(DataType.Email)] 属性之间有什么区别?
What is the difference between the [EmailAddress] and the [DataType(DataType.Email)] attribute?
[电话] 和 [DataType(DataType.PhoneNumber)] 属性之间有什么区别?
What is the difference between the [Phone] and [DataType(DataType.PhoneNumber)] attribute?
[EmailAddress]
public string Email { get; set; }
[Phone]
public string Phone { get; set; }
和
[DataType(DataType.Email)]
public string Email { get; set; }
[DataType(DataType.PhoneNumber)]
public string Phone { get; set; }
这些相同还是有区别?有什么区别?哪个是首选方式?什么时候应该使用?
Are these the same or is there any difference? What is the difference? Which is the preferred way? When should which be used?
推荐答案
DataTypeAttribute 更改< input> 元素的 type 属性由MVC渲染.
DataTypeAttribute changes the type attribute of the <input> elements rendered by MVC.
@David是正确的，因为 EmailAddressAttribute 是从 DataTypeAttribute 派生的，因此使用 [DataType(DataType.Email)] 获得的所有功能也是正确的使用 [EmailAddress] 时显示.这两个属性都会导致MVC呈现HTML < input type ="email"> 元素.
@David is right that EmailAddressAttribute derives from DataTypeAttribute, so all functionality you get with [DataType(DataType.Email)] is also present when you use [EmailAddress]. Both attributes cause MVC to render HTML <input type="email"> elements.
但是， EmailAddressAttribute 在此之上添加了服务器端验证.即如果仅使用 DataTypeAttribute ，则不会进行服务器端验证！您可以轻松地使用每个属性来测试模型.对于它们中的每一个，您都应该获得客户端验证，并且应该不可能使用无效的电子邮件地址提交表单.但是，如果将< input> 元素类型更改为 text (通过Firebug或诸如此类)，则将删除该验证，并将能够提交带有任何内容的表单您喜欢的文字.然后，在提交表单所调用的操作中放置一个断点，并检查 ModelState.IsValid 的值-当您使用 DataTypeAttribute 时，它是 true .当您使用 EmailAddressAttribute 时，它为 false .这是因为后者添加了一些基于正则表达式的服务器端验证.
However, EmailAddressAttribute adds server-side validation on top of that. I.e. there is no server-side validation if you only use DataTypeAttribute! You can easily test your model with each of those attributes. For each of them, you should get client-side validation and it shouldn't be possible to submit the form with invalid email address. However, if you change the <input> element type to text (via Firebug or whatnot), you will remove that validation and will be able to submit the form with whatever text you like. Then, put a breakpoint in the action invoked by submitting the form and examine the value of ModelState.IsValid - when you use DataTypeAttribute, it is true. When you use EmailAddressAttribute, it is false. This is because the latter adds some regex-based server-side validation.
结论:您应该使用 EmailAddressAttribute 等，否则，您实际上并没有真正在进行验证，而是依靠客户端来完成验证(Bad Thing™).
Conclusion: you should use EmailAddressAttribute et al., otherwise you're not really doing the validation on your end and rely on the client to do it (a Bad Thing™).
当然，您也可以使用 DataTypeAttribute 并实现自己的服务器端验证(例如，由于任何原因， EmailAddressAttribute 中的验证都不起作用).
Of course you can also use DataTypeAttribute and implement your own server-side validation (e.g. because the one in EmailAddressAttribute doesn't work for you for whatever reason).
这篇关于EmailAddress或DataType.Email属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！