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!?
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)
{
}
}
}