依赖注入接受构造PARAMS设置筛选器属性 [英] Setup filter attribute for dependency injection to accept params in constructor

问题描述

我下面这个页面一个ninject过滤属性设置。

对于他们来说，他们有：

  .WithConstructorArgumentFromControllerAttribute＆LT; LogAttribute＆GT;（
      LOGLEVEL属性=＆GT; attribute.LogLevel）;
 

第二个参数期待一个 Func键＆LT; LogAttribute，对象＆gt;回调。他们的实际参数列表的设置如下：

 日志（LogLevel的= Level.Debug）
 

但我的过滤属性的设置如下：

 公共类AuthAttribute：FilterAttribute {}公共类AuthFilter：个IAuthorizationFilter
{    私人只读IUserService userService;
    私人的String []的作用;    //停留在构造函数也。如何接受PARAMS？
    公共AuthFilter（IUserService userService，PARAMS字符串[]的角色）
    {
        this.userService = userService;
        this.roles =角色;
    }
    公共无效OnAuthorization（AuthorizationContext filterContext）
    {
        抛出新NotImplementedException（）;
    }
}
 

不知怎的，这是错误的。因为我希望我的过滤器看起来像：

  [验证（管理，的Contrib）]
 

我的绑定：

  kernel.BindFilter＆LT; AuthFilter＆GT;（FilterScope.Controller，0）
            .WhenControllerHas＆LT; AuthAttribute＆GT;（）
            .WithConstructorArgumentFromControllerAttribute＆LT; AuthAttribute＆GT;（角色，/ *困在这里* /）
 

解决方案

您需要让角色进入你的属性的属性。

属性：

 公共类AuthAttribute：FilterAttribute
{
  公共字符串[] {角色获得;组; }  公共AuthAttribute（PARAMS字符串[]的角色）
  {
      this.Roles =角色;
  }
}
 

过滤器：

 公共类AuthFilter：个IAuthorizationFilter
{  私人只读IUserService userService;
  私人只读字符串[]的作用;  公共AuthFilter（IUserService userService，字符串[]的角色）
  {
    this.userService = userService;
    this.roles =角色;
  }  公共无效OnAuthorization（AuthorizationContext filterContext）
  {
    //做东西
  }
}
 

控制器

  [AuthAttribute（A，B）
   公共类YourController：控制器
   {   }
 

绑定：

  kernel.BindFilter＆LT; AuthFilter＆GT;（FilterScope.Controller，0）
            .WhenControllerHas＆LT; AuthAttribute＆GT;（）
            .WithConstructorArgumentFromControllerAttribute＆LT; AuthAttribute＆GT;（角色，属性= GT; attribute.Roles）;
 

I'm following a ninject filter attribute setup on this page.

For them, they have:

.WithConstructorArgumentFromControllerAttribute<LogAttribute>(
      "logLevel", attribute => attribute.LogLevel);

The second parameter is expecting a Func<LogAttribute, object> callback. Their actual param list is setup as follows:

Log(LogLevel = Level.Debug)

But my filter attribute is setup as follows:

public class AuthAttribute : FilterAttribute { }

public class AuthFilter : IAuthorizationFilter
{

    private readonly IUserService userService;
    private string[] roles;

    //Stuck on the constructor also. How do I accept params?
    public AuthFilter(IUserService userService, params string[] roles)
    {
        this.userService = userService;
        this.roles = roles;
    }
    public void OnAuthorization(AuthorizationContext filterContext)
    {
        throw new NotImplementedException();
    }
}

Somehow this is wrong. Because I want my filter to look like:

[Auth("Admin", "Contrib")]

My bindings:

 kernel.BindFilter<AuthFilter>(FilterScope.Controller, 0)
            .WhenControllerHas<AuthAttribute>()
            .WithConstructorArgumentFromControllerAttribute<AuthAttribute>("roles", /*Stuck here*/)

解决方案

You need to make roles into a property in your attribute.

Attribute:

public class AuthAttribute : FilterAttribute 
{ 
  public string[] Roles { get; set; }

  public AuthAttribute(params string[] roles)
  {
      this.Roles = roles;
  }
}

Filter:

public class AuthFilter : IAuthorizationFilter
{

  private readonly IUserService userService;
  private readonly string[] roles;

  public AuthFilter(IUserService userService, string[] roles)
  {
    this.userService = userService;
    this.roles = roles;
  }

  public void OnAuthorization(AuthorizationContext filterContext)
  {
    //do stuff
  }
}

Controller

   [AuthAttribute("a", "b")]
   public class YourController : Controller 
   {

   }

Binding:

kernel.BindFilter<AuthFilter>(FilterScope.Controller, 0)
            .WhenControllerHas<AuthAttribute>()
            .WithConstructorArgumentFromControllerAttribute<AuthAttribute>("roles", attribute => attribute.Roles);

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