c# - 获取对象列表的 MVC 客户端验证的完整属性名称

Question

我正在编写一个依赖于模型中另一个命名属性的自定义 MVC 验证属性。实现 IClientValidatable 我的代码如下所示:

public IEnumerable<ModelClientValidationRule> GetClientValidationRules
    (ModelMetadata metadata, ControllerContext context)
    {            
        var name = metadata.DisplayName ?? metadata.PropertyName;
        ModelClientValidationRule rule = new ModelClientValidationRule()
        { ErrorMessage = FormatErrorMessage(name), ValidationType = "mycustomvalidation" };
        rule.ValidationParameters.Add("dependentproperty", dependentProperty);

        yield return rule;
    }

问题是我试图在元素列表中使用它。依赖属性在 View 中呈现，名称为 MyListOfObjects[0].DependentProperty，验证规则呈现为 data-val-mycustomvalidation-dependentproperty="DependentProperty"

如何从 GetClientValidationRules(ModelMetadata metadata, ControllerContext context) 中访问依赖属性的全名，以便它呈现为 data-val-mycustomvalidation-dependentproperty="MyListOfObjects[ 0].DependentProperty"

模型看起来像这样:

public class MyClass
{
    public string SomeValue { get; set; }
    public List<Item> MyListOfObjects  { get; set; }

    public class Item
    {
        [MyCustomValidation("DependentProperty")]
        public int MyValidatedElement  { get; set; }

        public int DependentProperty  { get; set; }

    }
}  

Answer 1

您不需要验证属性中的完全限定属性名称，并且在任何情况下都无法确定它，因为验证上下文(在您的情况下)是 typeof Item(该属性没有上下文父 MyClass 的)。

您确实需要全名的地方是在客户端脚本中(当您将 adapter 添加到 $.validator.unobtrusive 时。以下脚本将返回 id依赖属性的属性

myValidationNamespace = {
  getDependantProperyID: function (validationElement, dependantProperty) {
    if (document.getElementById(dependantProperty)) {
      return dependantProperty;
    }
    var name = validationElement.name;
    var index = name.lastIndexOf(".") + 1;
    dependantProperty = (name.substr(0, index) + dependantProperty).replace(/[\.\[\]]/g, "_");
    if (document.getElementById(dependantProperty)) {
        return dependantProperty;
    }
    return null;
  }
}

然后您可以在初始化客户端验证时使用它

$.validator.unobtrusive.adapters.add("mycustomvalidation", ["dependentproperty"], function (options) {
  var element = options.element;
  var dependentproperty = options.params.dependentproperty;
  dependentproperty = myValidationNamespace.getDependantProperyID(element, dependentproperty);
  options.rules['mycustomvalidation'] = {
    dependentproperty: dependentproperty
  };
  options.messages['mycustomvalidation'] = options.message;
});