在我的 ASP.NET MVC 应用程序模型中,我希望仅在选中特定复选框时才根据需要验证文本框。
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?
谢谢你。
最佳答案
看看这个:http://blogs.msdn.com/b/simonince/archive/2010/06/04/conditional-validation-in-mvc.aspx
我对代码进行了一些修改以满足我的需要。也许您也从这些变化中受益。
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; }
关于asp.net-mvc - 依赖于另一个字段的属性,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3713281/