如何在asp.net中向动作过滤器添加参数

本文关键字:过滤器 添加 参数 asp net | 更新日期: 2023-09-27 18:04:31

我有以下过滤器属性,并且我可以将字符串数组传递给该属性,如[MyAttribute("string1", "string2")]

public class MyAttribute : TypeFilterAttribute
{
    private readonly string[] _ids;
    public MyAttribute(params string[] ids) : base(typeof(MyAttributeImpl))
    {
        _ids = ids;
    }
    private class MyAttributeImpl : IActionFilter
    {
        private readonly ILogger _logger;
        public MyAttributeImpl(ILoggerFactory loggerFactory)
        {
            _logger = loggerFactory.CreateLogger<MyAttribute>();
        }
        public void OnActionExecuting(ActionExecutingContext context)
        {
            // HOW DO I ACCESS THE IDs VARIABLE HERE ???
        }
        public void OnActionExecuted(ActionExecutedContext context)
        {
        }
    }
}

我如何将字符串数组_ids传递到动作过滤器的实现?我是不是错过了什么很明显的东西!?

如何在asp.net中向动作过滤器添加参数

TypeFilterAttribute具有Argument属性(类型为object[]),您可以将参数传递给实现的构造函数。因此,应用到您的示例中,您可以使用以下代码:

public class MyAttribute : TypeFilterAttribute
{        
    public MyAttribute(params string[] ids) : base(typeof(MyAttributeImpl))
    {
        Arguments = new object[] { ids };
    }
    private class MyAttributeImpl : IActionFilter
    {
        private readonly string[] _ids;
        private readonly ILogger _logger;
        public MyAttributeImpl(ILoggerFactory loggerFactory, string[] ids)
        {
            _ids = ids;
            _logger = loggerFactory.CreateLogger<MyAttribute>();
        }
        public void OnActionExecuting(ActionExecutingContext context)
        {
            // NOW YOU CAN ACCESS _ids
            foreach (var id in _ids)
            {
            }
        }
        public void OnActionExecuted(ActionExecutedContext context)
        {
        }
    }
}