Question

I'd like to pass varying number of parameters to an ActionFilter. example:

[TypeFilter(typeof(AuthorizeFilter), Arguments = new object[] {PolicyName.CanUpdateModule, PolicyName.CanReadModule })]
public async Task<IActionResult> PutModule([FromRoute] Guid id, [FromBody] Module module)

I defined filter like below and I get the error "InvalidOperationException: A suitable constructor for type 'MyApp.AuthFilters.AuthorizeFilter' could not be located. Ensure the type is concrete and services are registered for all parameters of a public constructor.". How do I get around this issue?

public class AuthorizeFilter : ActionFilterAttribute
{
    private readonly IAuthorizationService _authService;
    private readonly string[] _policyNames;

    public AuthorizeFilter(IAuthorizationService authService,params string[] policyNames)
    {
        _authService = authService;
        _policyNames = policyNames.Select(f => f.ToString()).ToArray();
    }...
}

Answer 1

关闭但没有雪茄。您使用错误的参数调用过滤器。您已将其称为TypeFilterAttribute，因为您需要传入DI 和参数。

现在你只需修复你的论点。你想传入一个字符串数组，但你传入了几个字符串。

[TypeFilter(typeof(AuthorizeFilter), 
    Arguments = new object[] {
        new string[] { PolicyName.CanUpdateModule,  PolicyName.CanReadModule }
    }
)]
public async Task<IActionResult> PutModule([FromRoute] Guid id, [FromBody] Module module) {
    /*do stuff*/
}

尽管如此，您的IAuthorizationService仍然需要在DI容器中注册才能得到解决。

然后，您需要从params课程中删除AuthorizeFilter关键字：

public class AuthorizeFilter : ActionFilterAttribute
{
    private readonly IAuthorizationService _authService;
    private readonly string[] _policyNames;

    public AuthorizeFilter(IAuthorizationService authService,string[] policyNames)
    {
        _authService = authService;
        _policyNames = policyNames;
    }
    /* ... */
}

Asp.Net core ActionFilter - how to pass varying number of parameters

1 个答案: