[英]create custom validation attribute in ASP.net core
I want to use attribute to make sure certain headers are present in my request. 我想使用属性来确保请求中存在某些标头。 This is not an authorize attribute. 这不是授权属性。 One of the use case is when a request is received, I want to make sure that there is X-Request-For header for older clients, that can be handled properly. 用例之一是当接收到请求时,我要确保为旧客户端提供X-Request-For标头,可以正确处理。 There are other use cases aswell, however all of them go around reading a specific http header value and taking appropriate action before controller takes the charge. 还有其他用例,但是所有这些用例都会四处读取特定的http标头值,并在控制器负责之前采取适当的措施。
[MyAttribute(HeaderOptions.RequestFor)
[httpPost]
public MyMethod(string data)
{
...
}
You can create such an attribute using MVC filters . 您可以使用MVC过滤器创建这样的属性。
For example create a filter like this: 例如,创建一个这样的过滤器:
public class CheckHeaderFilter : Attribute, IResourceFilter
{
private readonly string[] _headers;
public CheckHeaderFilter(params string[] headers)
{
_headers = headers;
}
public void OnResourceExecuting(ResourceExecutingContext context)
{
if (_headers == null) return;
if (!_headers.All(h => context.HttpContext.Request.Headers.ContainsKey(h)))
{
//do whatever you need to do when check fails
throw new Exception("Necessary HTTP headers not present!");
}
}
public void OnResourceExecuted(ResourceExecutedContext context)
{
}
}
and then use it on an action (or controller): 然后在动作(或控制器)上使用它:
[CheckHeaderFilter(HeaderOptions.RequestFor)]
public IActionResult Index()
{
...
}
I strongly recommend you read through the docs, so you know which type of filter to use. 我强烈建议您通读文档,以便知道使用哪种类型的过滤器。 In this example I used ResourceFilter as it's fairly early in the pipeline (right after auth and before model binding - which makes sense for your scenario). 在此示例中,我使用了ResourceFilter,因为它在管道中处于早期阶段(就在auth之后和模型绑定之前-这对您的情况而言很有意义)。
But depending on what you need to do you should use the appropriate filter. 但是,根据您需要执行的操作,应使用适当的过滤器。
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