Question

我正在尝试创建一个方面来管理类的一些属性的安全性。但是，一个成员的安全性方面依赖于该类的另一个属性中的数据。我已经阅读了关于IntroduceAspect的一些教程，但我不确定这是我需要的。

public class ClassWithThingsIWantToSecure
{

    [SecurityAspectHere(inherits from LocationInterceptionAspect)]
    public int ThingIWantToSecure;

    public string ThingINeedToKnowAboutInSecurityAspect;
}

有人能指出我在SecurityAspect中提供ThingINeedToKnowAboutInSecurityAspect的运行时值的正确方向吗？

Answer 1

之前我做过类似的事情，我已经在安装了postharp的机器上进行了测试，只是试了一下，这里是代码......

    class Program
{
    static void Main(string[] args)
    {
        Baldrick baldrick = new Baldrick();
        baldrick.ThingINeedToKnowAboutInSecurityAspect = "Bob";
        Console.WriteLine("There are {0} beans", baldrick.ThingIWantToSecure);

        baldrick.ThingINeedToKnowAboutInSecurityAspect = "Kate";

        try
        {
            //This should fail
            Console.WriteLine("There are {0} beans", baldrick.ThingIWantToSecure);
        }
        catch (Exception ex)
        {
            //Expect the message from my invalid operation exception to be written out (Use your own exception if you prefer)
            Console.WriteLine(ex.Message);
        }
        Console.ReadLine();
    }


}

[Serializable]
public class SecurityAspect : LocationInterceptionAspect
{
    public override void OnGetValue(LocationInterceptionArgs args)
    {
        ISecurityProvider securityProvider = args.Instance as ISecurityProvider;
        if (securityProvider != null && securityProvider.ThingINeedToKnowAboutInSecurityAspect != "Bob")
            throw new InvalidOperationException("Access denied (or a better message would be nice!)");
        base.OnGetValue(args);
    }
}



public interface ISecurityProvider
{
    string ThingINeedToKnowAboutInSecurityAspect { get; }
}

public class Baldrick : ISecurityProvider
{
    public string ThingINeedToKnowAboutInSecurityAspect { get; set; }

    [SecurityAspect]
    public int ThingIWantToSecure{get { return 3; }}
}

因此，这里的想法是询问正在装饰的对象的实例的args.Instance属性。

使用实例成员发布锐利

1 个答案: