我可以通过编程检查用户是否被授权使用给定的控制器方法吗?

是的,您可以在UI和控制器之间的中间层检查特定用户是否可以访问请求的控制器。

/ 我们需要在我们的视图中的某个地方添加Async方法 /

@if (await Url.HasAccessToController(urlActionContext))
{
    <p>You have access</p>
}

方法的实施:

public static async Task<bool> HasAccess(this IUrlHelper Helper, UrlActionContext ActionContext, string httpMethod = "GET" )
{
//U need to Implement this method as per your needs

    var httpContext = Helper.ActionContext.HttpContext;

    var routeValues = new RouteValueDictionary(ActionContext.Values);
    routeValues["action"] = ActionContext.Action;
    routeValues["controller"] = ActionContext.Controller;          

    var path = Helper.Action(ActionContext);

    var features = new FeatureCollection();
    features.Set<IHttpRequestFeature>(new HttpRequestFeature()
    {
        Method = httpMethod, 
        Path = path,

    });

    var ctx = new DefaultHttpContext(features);      

    var routeContext = new RouteContext(ctx);

    foreach (var entry in routeValues)
    {
        routeContext.RouteData.Values.Add(entry.Key, entry.Value);
    }

    var actionSelector = httpContext.RequestServices.GetRequiredService<IActionSelector>();

    var provider = httpContext.RequestServices.GetRequiredService<IActionDescriptorCollectionProvider>();       
    var actionDescriptors = actionSelector.SelectCandidates(routeContext);

    var actionDescriptor = actionSelector.SelectBestCandidate(routeContext, actionDescriptors);

    var authService = httpContext.RequestServices.GetRequiredService<IAuthorizationService>();

    var ok = await authService.AuthorizeAsync(httpContext.User, actionDescriptor, "YOUR_POLICY"); 

    return ok;

}