ASP.NET MVC:添加自定义的ErrorMessage并入显示名称自定义ValidationAttribute
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18-09-2019 - |
题
我使用ASP.NET MVC与DataAnnotations。我创建了以下自定义ValidationAttribute工作正常。
public class StringRangeAttribute : ValidationAttribute
{
public int MinLength { get; set; }
public int MaxLength { get; set; }
public StringRangeAttribute(int minLength, int maxLength)
{
this.MinLength = (minLength < 0) ? 0 : minLength;
this.MaxLength = (maxLength < 0) ? 0 : maxLength;
}
public override bool IsValid(object value)
{
//null or empty is <em>not</em> invalid
string str = (string)value;
if (string.IsNullOrEmpty(str))
return true;
return (str.Length >= this.MinLength && str.Length <= this.MaxLength);
}
}
然而,出现的错误消息是标准的“的字段*无效”。我想改变这是:“在[显示名称]必须与[使用MINLENGTH]和[最大长度]”,但我无法弄清楚如何从这个类中获取字段的显示名称或连名字
任何人都知道?
解决方案
稍微修改StringLengthAttribute:
public class StringRangeAttribute : ValidationAttribute
{
// Methods
public StringRangeAttribute(int minimumLength, int maximumLength)
: base(() => "The {0} must be between {1} and {2} chars long.")
{
MaximumLength = maximumLength;
MinimumLength = minimumLength;
}
public override string FormatErrorMessage(string name)
{
return string.Format(CultureInfo.CurrentCulture, ErrorMessageString, new object[] { name, MinimumLength ,MaximumLength });
}
public override bool IsValid(object value)
{
if (value != null)
{
return (((string)value).Length <= MaximumLength) && (((string)value).Length >= MinimumLength);
}
return true;
}
public int MaximumLength { get; set; }
public int MinimumLength { get; set; }
}
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