在模型中动态设置RegularExpression

问题描述

我需要在模型中动态设置RegularExpression.

I need to set RegularExpression Dynamically in Model.

我的意思是，我已经将RegularExpression存储在表中，然后将该值存储在一个变量中.

I mean, I have stored RegularExpression in table and then I will store that value in one variable.

现在，我想在Regular Express验证中提供该变量.

Now I want to supply that variable in Regular Express validation.

即

[RegularExpression(VariableValue, ErrorMessage = "Valid Phone is required")]

类似

即

string CustomExpress = "@"^(\+|\d)(?:\+?1[-. ]?)?\(?([0-9]{2})\)?[-. ]?([0-9]{1})[-. ]?([0-9]{9})$" (from Database's table)

[RegularExpression(CustomExpress, ErrorMessage = "Valid Phone is required")]
public string Phone { get; set; }

推荐答案

您有两个选择，要么创建自己的验证属性，要么将整个模型设置为"validatable".

You have two options, either you create your own validation attribute or you make your whole model "validatable".

public class RegexFromDbValidatorAttribute : ValidationAttribute
{
    private readonly IRepository _db;

    //parameterless ctor that initializes _db

    public override ValidationResult IsValid(object value, ValidationContext context)
    {
        string regexFromDb = _db.GetRegex();

        Regex r = new Regex(regexFromDb);

        if (value is string && r.IsMatch(value as string)){
            return ValidationResult.Success;
        }else{
            return new ValidationResult(FormatMessage(context.DisplayName));
        }
    }
}

然后在您的模型上:

[RegexFromDbValidator]
public string Telephone {get; set;}

选项2

public SomeModel : IValidatableObject
{
    private readonly IRepository _db;

    //don't forget to initialize _db in ctor

    public string Telephone {get; set;}

    public IEnumerable<ValidationResult> Validate(ValidationContext context)
    {

        string regexFromDb = _db.GetRegex();

        Regex r = new Regex(regexFromDb);

        if (!r.IsMatch(Telephone))
            yield return new ValidationResult("Invalid telephone number", new []{"Telephone"});
    }
}

在这里 一个很好的资源，解释了如何创建验证属性

Here's a good resource that explains how to create validation attributes

此处 IValidatableObject的使用

Here's an example of using IValidatableObject

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