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：

System.Reflection.TargetException: Object does not match target type.