我正在尝试创建自定义验证属性。
public class PhoneValidator : ValidationAttribute
{
public override bool IsValid(object value)
{
return new RegularExpressionAttribute(@"^[+0]\d+").IsValid(Convert.ToString(value).Trim());
}
}
我用这个来使用
[PhoneValidator]
public string PhoneNumber { get; private set; }
我从网站上复制了它,理论上这应该可行。但我无法让它发挥作用。
最佳答案
这是来自 MSDN 的示例:
PhoneMaskAttribute .cs:
using System;
using System.Globalization;
using System.ComponentModel.DataAnnotations;
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]
sealed public class PhoneMaskAttribute : ValidationAttribute
{
// Internal field to hold the mask value.
readonly string _mask;
public string Mask
{
get { return _mask; }
}
public PhoneMaskAttribute(string mask)
{
_mask = mask;
}
public override bool IsValid(object value)
{
var phoneNumber = (String)value;
bool result = true;
if (this.Mask != null)
{
result = MatchesMask(this.Mask, phoneNumber);
}
return result;
}
// Checks if the entered phone number matches the mask.
internal bool MatchesMask(string mask, string phoneNumber)
{
if (mask.Length != phoneNumber.Trim().Length)
{
// Length mismatch.
return false;
}
for (int i = 0; i < mask.Length; i++)
{
if (mask[i] == 'd' && char.IsDigit(phoneNumber[i]) == false)
{
// Digit expected at this position.
return false;
}
if (mask[i] == '-' && phoneNumber[i] != '-')
{
// Spacing character expected at this position.
return false;
}
}
return true;
}
public override string FormatErrorMessage(string name)
{
return String.Format(CultureInfo.CurrentCulture,
ErrorMessageString, name, this.Mask);
}
}
用法:
客户元数据.cs:
using System.Web.DynamicData;
using System.ComponentModel.DataAnnotations;
[MetadataType(typeof(CustomerMetadata))]
public partial class Customer
{
}
public class CustomerMetadata
{
[PhoneMask("999-999-9999",
ErrorMessage = "{0} value does not match the mask {1}.")]
public object Phone;
}
链接:
How to: Customize Data Field Validation in the Data Model Using Custom Attributes
关于c# - 如何创建自定义验证属性?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23780943/