asp.net-mvc – 从ModelMetaData获取另一个属性的值

我试图从自定义验证属性的GetClientValidationRules方法中获取另一个属性的值.

这是我的尝试(基于另一个问题的Darin’s response)：

public IEnumerable<ModelClientValidationRule> GetClientValidationRules(
    ModelMetadata metadata,ControllerContext context)
{
    var parentType = metadata.ContainerType;
    var parentMetaData = ModelMetadataProviders.Current
        .GetMetadataForType(null,parentTypE);

    var parentMetaData = ModelMetadataProviders.Current
        .GetMetadataForProperties(context.Controller.ViewData.model,parentTypE); 

    var otherProperty = parentMetaData.FirstOrDefault(p => 
        p.propertyName == "SomeProperty");

    var otherValue = otherProperty.Model;

    var rule = new ModelClientValidationRule
    {
        ValidationType = "customvalidatorattribute",Errormessage = this.FormatErrormessage(metadata.GetDisplayName()),};

    yield return rule;
}

但是,在尝试设置otherValue时,我得到：

var parentMetaData = ModelMetadataProviders.Current
    .GetMetadataForProperties(context.Controller.ViewData.model,parentTypE); 
var otherValue = (String)parentMetaData.FirstOrDefault(p => 
    p.propertyName == "SomeProperty").Model;