[英]How to use Reflection in FluentValidation?
I have a scneario in which I want to use reflection to do validation using FluentValidation.我有一个场景,我想在其中使用反射来使用 FluentValidation 进行验证。 Someting like this:像这样:
public class FooValidator : AbstractValidator<Foo>
{
public FooValidator(Foo obj)
{
// Iterate properties using reflection
var properties = ReflectionHelper.GetShallowPropertiesInfo(obj);
foreach (var prop in properties)
{
// Create rule for each property, based on some data coming from other service...
//RuleFor(o => o.Description).NotEmpty().When(o => // this works fine when foo.Description is null
RuleFor(o => o.GetType().GetProperty(prop.Name)).NotEmpty().When(o =>
{
return true; // do other stuff...
});
}
}
}
The call to ReflectionHelper.GetShallowPropertiesInfo(obj)
returns "shallow" properties of object. Then, for each property I create a rule.对ReflectionHelper.GetShallowPropertiesInfo(obj)
的调用返回 object 的“浅”属性。然后,我为每个属性创建一个规则。 This is my code for get properties of object:这是我获取 object 属性的代码:
public static class ReflectionHelper
{
public static IEnumerable<PropertyInfo> GetShallowPropertiesInfo<T>(T o) where T : class
{
var type = typeof(T);
var properties =
from pi in type.GetProperties(BindingFlags.Public | BindingFlags.Instance)
where pi.PropertyType.Module.ScopeName == "CommonLanguageRuntimeLibrary"
&& !(pi.PropertyType.IsGenericType && pi.PropertyType.GetGenericTypeDefinition() == typeof(ICollection<>))
select pi;
return properties;
}
}
This code compile and can be executed此代码编译并可以执行
IValidator<Foo> validator = new FooValidator(foo);
var results = validator.Validate(foo);
But it doesn't work properly (validation never fails).但它不能正常工作(验证永远不会失败)。 Is there any way to achieve this?有什么办法可以做到这一点?
Note: Demo code can be found int Github at FluentValidationReflection注意:演示代码可以在 FluentValidationReflection 找到 int Github
Finally I've found a solution that works. 最后,我找到了一个可行的解决方案。 I've created a custom PropertyValidator that receives a PropertyInfo parameter: 我已经创建了一个接收PropertyInfo参数的自定义PropertyValidator:
public class CustomNotEmpty<T> : PropertyValidator
{
private PropertyInfo _propertyInfo;
public CustomNotEmpty(PropertyInfo propertyInfo)
: base(string.Format("{0} is required", propertyInfo.Name))
{
_propertyInfo = propertyInfo;
}
protected override bool IsValid(PropertyValidatorContext context)
{
return !IsNullOrEmpty(_propertyInfo, (T)context.Instance);
}
private bool IsNullOrEmpty(PropertyInfo property, T obj)
{
var t = property.PropertyType;
var v = property.GetValue(obj);
// Omitted for clarity...
}
}
And a extension method for IRuleBuilder
: 还有IRuleBuilder
的扩展方法:
public static class ValidatorExtensions
{
public static IRuleBuilderOptions<T, T> CustomNotEmpty<T>(
this IRuleBuilder<T, T> ruleBuilder, PropertyInfo propertyInfo)
{
return ruleBuilder.SetValidator(new CustomNotEmpty<T>(propertyInfo));
}
}
With this I can change my FooValidator
as follows: 这样,我可以如下更改FooValidator
:
public class FooValidator : AbstractValidator<Foo>
{
public FooValidator(Foo obj)
{
// Iterate properties using reflection
var properties = ReflectionHelper.GetShallowPropertiesInfo(obj);
foreach (var prop in properties)
{
// Create rule for each property, based on some data coming from other service...
RuleFor(o => o)
.CustomNotEmpty(obj.GetType().GetProperty(prop.Name))
.When(o =>
{
return true; // do other stuff...
});
}
}
}
And now I'm be able to use Reflection to add rules for specific properties 现在,我可以使用Reflection添加特定属性的规则
For reflection i use为了反思我使用
RuleFor(x => new obj().GetType().GetProperty(x.Filter.ColumnName)).NotNull(); RuleFor(x => new obj().GetType().GetProperty(x.Filter.ColumnName)).NotNull();
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