基于另一个属性的范围验证 [英] Range validation based on another property

问题描述

目前，我有FooModel模型

Currently I have the model FooModel

public class FooModel
{
    [Range(0.001, 10000, ErrorMessage = "{0} must be a decimal/number between {1} and {2}.")]
    [RangeValidator("BarMax")]
    public decimal? Bar { get; set; }

    public decimal BarMax { get; set; }
}

根据建议，我创建了一个自定义范围验证器

Following suggestions I created a custom range validator

public class RangeValidator : ValidationAttribute
{
    private readonly string dependentPropery;

    public RangeValidator(string dependentpropery)
        : base()
    {
        this.dependentPropery = dependentpropery;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        System.Reflection.PropertyInfo property = validationContext.ObjectType.GetProperty(this.dependentPropery);
        if (property == null)
        {
            return new ValidationResult(string.Format("Unknown Property {0}", this.dependentPropery));
        }

        var value1 = property.GetValue(validationContext.ObjectInstance, null) as decimal?;
        if (!value1.HasValue)
        {
            return null;
        }

        decimal actualValue;

        if (value == null)
        {
            return new ValidationResult("Value can not be empty.");
        }

        decimal.TryParse(value.ToString(), out actualValue);
        if (actualValue <= 0)
        {
            return new ValidationResult(string.Format("{0} Value can not be empty.", this.dependentPropery));
        }

        return actualValue > value1.Value ? new ValidationResult(string.Format("Value cannot exceed {0} {1}.", this.dependentPropery, value1.Value)) : null;
    }
} 

推荐答案

您不能在range属性中，但是可以添加

You can't in the range attribute, but you could add the MVC Foolproof Validation library. Then you can set your range to be the max that your storage or primitive type will hold, then use foolproof's lessthan to constrain it to the BarMax property.

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