.NET Core中的DataAnnotations

引用

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

常用的 DataAnnotations
1.Required :属性值必须非空或者不能只是空格,如果允许全空格可以[Required(AllowEmptyStrings = true)]
2.DisplayName :显示名 – 定义表单字段的提示名称
3.StringLength :字符串长度不能超过给定的最大长度,也可以指定最小长度:[StringLength(10, MinimumLength=2)]
4.Range :范围 – 数字的可输入范围[Range(10, 20)] ,属性值必须在指定的数值范围内,可以使用数值类型的最大最小值比如int.MinValue、int.MaxValue
5.Bind :绑定 – 列出在将请求参数绑定到模型的时候,包含和不包含的字段
6.ScaffoldColumn :支架列 – 在编辑表单的时候,需要隐藏起来的的字符 [ScaffoldColumn(true|false)]
7.Compare: 比较 – 与制定的字段值进行比较 具体见代码 [Compare(“MyOtherProperty”)]两个属性必须相同值,比如我们要求用户重复输入两次邮件地址时有用
8.RegularExpre ssion: 正则表达式匹配,字符串值必须匹配正则表达式,默认大小写敏感,可以使用(?i)修饰符关闭大小写敏感,比如[RegularExpre ssion(“(?i)mypattern”)]
9.DataType :在前端显示的文本框类型
10. Remote :服务端验证
11. [Editable(false)] //放在主键上显示不可修改

客户端验证
关于Model层数据验证的一些验证规则与相关验证属性标签小集
(1)常规验证(必填字段、字符串长度、正则表达式验证、范围验证<数值、日期>等)
1. 必填字段
[Required]
public string FirstName { get; set; }
2. 字段长度 至多n位:
[StringLength(160)]
public string FirstName { get; set; }
要求至少n位:
[StringLength(160, MinimumLength=3)]
public string FirstName { get; set; }
3. 正则验证
[RegularExpre ssion(@”[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}”)]
public string Email { get; set; }
4. 范围
[Range(35,44, UIHint(“IntSlider”))] //左右托动块
public int Age { get; set; }
小数的情况:
[Range(typeof(decimal), “0.00”, “49.99”)]
public decimal Price { get; set; }
5. 服务端参与的验证
[Remote(“CheckUserName”, “Account”, ErrorMessage = “该姓名已存在”)]
public string UserName { get; set; }
Remote异步请求验证,在[HttpGet]时获取指定Controller里面的指定方法验证, 次方法必须是[HttpGet]标记的,返回类型为Json类型的JavaScript对象。
然后在AccountController里指定一个CheckUserName方法:
public JsonResult CheckUserName(string username)
{
var result = Membership.FindUsersByName(username).Count == 0;
return Json(result, JsonRequestBehavior.AllowGet);
}
6. 比较
[RegularExpre ssion(@”[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}”)]
public string Email { get; set; }
[Compare(“Email”)]
public string EmailConfirm { get; set; }
public string EmailConfirm { get; set; }
7. 自定义错误消息
正则:
[RegularExpre ssion(@”[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}”,ErrorMessage=”Email doesn’t look like a valid email address.”)]
public string Email { get; set; }
具体示例如下:
[DisplayName(“分组名称”)]
[Required(ErrorMessage = “请输入账号”)]
[StringLength(50, ErrorMessage = “请勿输入超过 50 个字”)]
public string Name { get; set; }

[DisplayName(“排序字段”)]
[DataType(DataType.Password)]
[Required(ErrorMessage = “请输入排序字段”)]
[RegularExpre ssion(@”^([\d]+)$”, ErrorMessage = “请输入正确的Email.”)]
public string Sequence { get; set; }

[DisplayName(“备注”)]
[DataTyle(DataType.MultilineText)]//数据显示为多文本
[Required(AllowEmptyStrings=true, ErrorMessage = “请输入中文姓名”)]
[StringLength(50, ErrorMessage = “请勿输入超过 50 个字”)]
public string Describe { get; set; }

[DisplayName(“账号”)]
[Required(ErrorMessage = “请输入账号”)]
[StringLength(50, ErrorMessage = “请勿输入超过 50 个字”)]
public string Account { get; set; }

[DisplayName(“密码”)]
[DataType(DataType.Password)]
[Required(ErrorMessage = “请输入密码”)]
[StringLength(50, ErrorMessage = “请勿输入超过 50 个字”)]
public string Password { get; set; }

[Required]
[DataType(DataType.Password)]
[Display(Name = “Current password”)]
public string OldPassword { get; set; }(PMS已有

[Required]
[StringLength(100, ErrorMessage = “The {0} must be at least {2} characters long.”, MinimumLength = 6)]
[DataType(DataType.Password)]
[Display(Name = “New password”)]
public string NewPassword { get; set; }(PMS已有)

[Display(Name = “确认密码”)]
[Compare(“LogPassword”, ErrorMessage = “密码必须一致”)]
public virtual string LogPasswordConfirm { get; set; }(PMS已有)

[Display(Name = “Remember me?”)]
public bool RememberMe { get; set; }(PMS已有)

[DisplayName(“姓名”)]
[Required(ErrorMessage = “请输入姓名”)]
[StringLength(50, ErrorMessage = “请勿输入超过 50 个字”)]
public string ChName { get; set; } (PMS已有)

[DisplayName(“昵称”)]
[Required(ErrorMessage = “请输入昵称”)]
[StringLength(50, ErrorMessage = “请勿输入超过 50 个字”)]
public string NickName { get; set; }

[Display(Name = “出生日期”)]
//[Range(typeof(DateTime), “2011-12-31”, “1950-1-1”, ErrorMessage = “{0}的范围是{1}到{2}”)]
[DisplayFormat(DataFormatString = “{0:yyyy-MM-dd}”, ApplyFormatInEditMode = true)]//显示格式
public virtual DateTime? Birthday { get; set; } //表示值可为Null

[DisplayName(“年龄”)]
[Range(1, int.MaxValue, ErrorMessage = “请输入大于等于1的数”)]
public int Age { get; set; }

[DisplayName(“Email”)]
[Required(ErrorMessage = “请输入Email”)]
[StringLength(255, ErrorMessage = “请勿输入超过 255 个字”)]
[RegularExpre ssion(@”^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4})$”, ErrorMessage = “请输入正确的Email.”)]
[DataType(DataType.EmailAddress)]
public string Email { get; set; } (PMS已有)

[DisplayName(“电话号码”)]
[RegularExpre ssion(@”^((0\d{2,5}-)|
0\d2,5
0\d2,5
)?\d{7,8}(-\d{3,4})?$”, ErrorMessage = “电话格式有误。\n有效格式为:\n①本区7或8位号码[-3或4位分机号码,可选]\n②(3~5位区号)7或8位号码[-3或4位分机号码,可选]\n③3~5位区号-7或8位号码[-3或4位分机号码,可选]\n示例:023-12345678;(023)1234567-1234”)]
public string Phone { get; set; }

[Display(Name = “身份证号码”)]
[RegularExpre ssion(@”\d{17}[\d|X]|\d{15}”, ErrorMessage = “{0}的格式不正确”)]
public virtual string IdentityNo { get; set; }

[DisplayName(“是否为管理员”)]
public bool IsAdmin { get; set; }

[DisplayName(“代表图示”)]
[Required(ErrorMessage = “请选择代表图示”)]
[Range(1, 3, ErrorMessage = “输入的值必须介于 1 到 3之间”)]
public int AvatarIcon { get; set; }

[Display(Name = “逻辑删除标识”)]
public virtual int IsLogicDelete { get; set; }

[DisplayName(“验证码”)]
public string AuthCode { get; set; }

[DisplayName(“创建日期”)]
public DateTime CreateTime { get; set; }

[DisplayName(“网址”)]
[RegularExpre ssion(@”http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?”, ErrorMessage = “请输入合法的网址!\n示例:
https://abc.a;http://www.abc.dd”) ]
public string Httpaddress { get; set; }

普通文本:
[Required(ErrorMessage=”Your last name is required”)]
[StringLength(160, ErrorMessage=”Your last name is too long”)]
public string LastName { get; set; }
占位符:
[Required(ErrorMessage=”Your {0} is required.”)]
[StringLength(160, ErrorMessage=”{0} is too long.”)]
public string LastName { get; set; }
(2)数据库约束验证
如果不希望用户使用123456这样的过于简单的密码,可以使用check约束来实现:
ALTER TABLE staffinfoes WITH NOCHECK ADD CONSTRAINT chk_logPassword
CHECK (logPassword NOT IN(‘123′,’123123′,’123456’))
其中,staffinfoes是表名称,chk_logPassword是约束名称,logPassword是列名称

Display 、ErrorMessage 国际化显示(使用资源文件)

[Required]
//[RegularExpression("\\D+", ErrorMessage = "Error")]
[RegularExpression("\\D+", ErrorMessageResourceName = "Error", ErrorMessageResourceType = typeof(APP_GlobalResources.Resource))]
[Display(Name = "First", ResourceType = typeof(APP_GlobalResources.Resource))]
public string FirstName
{
	get { return _firstName; }
	set
	{
		_firstName = value;
		InvokePropertyChanged("FirstName");
	}
}

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