C# 正则表达式错误信息
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Regular expression error message
提问by John
Using the RegularExpression(@"^\d{1,15}$")], I want the user to enter digits up to 15 in length, which returns the error message 'Please enter up to 15 digits for a contact number'if this is not correct
使用RegularExpression(@"^\d{1,15}$")]，我希望用户输入最长 15 位的数字，如果这不正确，则会返回错误消息“请输入最多 15 位的联系号码”
[Required(ErrorMessage = ("Please enter up to 15 digits for a contact number")), Display(Name = "Contact Number"), RegularExpression(@"^\d{1,15}$")]
public string ContactNumber { get; set; }
If the user fails to do this I am left with the error message:
如果用户未能做到这一点，我会留下错误消息：
The field Contact Number must match the regular expression '^\d{1,15}$'.
instead of 'Please enter up to 15 digits for a contact number'...does anyone know why?
thanks
而不是'Please enter up to 15 digits for a contact number'......有谁知道为什么？谢谢
采纳答案by Darin Dimitrov
You have assigned the ErrorMessageto the RequiredAttribute(which you absolutely don't need in this case because of the regular expression). So:
您已将 the 分配ErrorMessage给 the RequiredAttribute（在这种情况下，由于正则表达式，您绝对不需要）。所以：
[Display(Name = "Contact Number")]
[RegularExpression(@"^\d{1,15}$", ErrorMessage = "Please enter up to 15 digits for a contact number")]
public string ContactNumber { get; set; }
回答by Jakub Konecki
You need to place your message in RegularExpressionattribute, not Requiredattribute.
您需要将消息放在RegularExpression属性中，而不是Required属性中。
You've added your error message to Requiredattribute, which means it will be displayed when the field is empty.
您已将错误消息添加到Required属性，这意味着它将在该字段为空时显示。
