在我的ASP.NET MVC应用程序的模型中,我想要验证一个文本框,只有当选中了一个特定的复选框时才需要。
就像是
public bool retired {get,set}; [requiredIf("retired",true)] public string retirementAge {get,set};
我怎样才能做到这一点?
谢谢。
解决方法
看看这个:
http://blogs.msdn.com/b/simonince/archive/2010/06/04/conditional-validation-in-mvc.aspx
public class requiredIfAttribute : ValidationAttribute { private requiredAttribute innerAttribute = new requiredAttribute(); public string DependentUpon { get; set; } public object Value { get; set; } public requiredIfAttribute(string dependentUpon,object value) { this.DependentUpon = dependentUpon; this.Value = value; } public requiredIfAttribute(string dependentUpon) { this.DependentUpon = dependentUpon; this.Value = null; } public override bool IsValid(object value) { return innerAttribute.IsValid(value); } } public class requiredIfValidator : DataAnnotationsModelValidator<requiredIfAttribute> { public requiredIfValidator(ModelMetadata Metadata,ControllerContext context,requiredIfAttribute attribute) : base(Metadata,context,attribute) { } public override IEnumerable<ModelClientValidationRule> GetClientValidationRules() { // no client validation - I might well blog about this soon! return base.GetClientValidationRules(); } public override IEnumerable<ModelValidationResult> Validate(object container) { // get a reference to the property this validation depends upon var field = Metadata.ContainerType.GetProperty(Attribute.DependentUpon); if (field != null) { // get the value of the dependent property var value = field.GetValue(container,null); // compare the value against the target value if ((value != null && Attribute.Value == null) || (value != null && value.Equals(Attribute.Value))) { // match => means we should try validating this field if (!Attribute.IsValid(Metadata.Model)) // validation Failed - return an error yield return new ModelValidationResult { Message = ErrorMessage }; } } } }
然后使用它:
public DateTime? DeptDateTime { get; set; } [requiredIf("DeptDateTime")] public string DeptAirline { get; set; }