相关疑难解决方法(0)

我在互联网上关注了一些文章和教程,以便创建一个自定义验证属性,该属性也支持asp.net mvc 4网站中的客户端验证.这就是我现在所拥有的:

RequiredIfAttribute.cs

[AttributeUsage(AttributeTargets.Property, AllowMultiple = true)] //Added
public class RequiredIfAttribute : ValidationAttribute, IClientValidatable
{
    private readonly string condition;
    private string propertyName; //Added

    public RequiredIfAttribute(string condition)
    {
        this.condition = condition;
        this.propertyName = propertyName; //Added
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        PropertyInfo propertyInfo = validationContext.ObjectType.GetProperty(this.propertyName); //Added
        Delegate conditionFunction = CreateExpression(validationContext.ObjectType, _condition);
        bool conditionMet = (bool)conditionFunction.DynamicInvoke(validationContext.ObjectInstance);

        if (conditionMet)
        {
            if (value == null)
            {
                return new ValidationResult(FormatErrorMessage(null));
            }
        }

        return ValidationResult.Success;
    }

    private Delegate CreateExpression(Type objectType, string expression) …