我正在尝试设置PostSharp方面RunOutOfProcessAttribute,以便它适用于：
>所有公共方法
>任何标有DoSpecialFunctionAttribute的方法,无论成员可访问性如何(public / protected / private / whatever).
到目前为止,我的RunOutOfProcessAttribute是这样定义的：
[Serializable]
[MulticastAttributeUsage(MulticastTargets.Method,TargetMemberAttributes = MulticastAttributes.Public)]
[AttributeUsage(AttributeTargets.Class)]
public class RunOutOfProcessAttribute : MethodInterceptionAspect
{
public override void OnInvoke(MethodInterceptionArgs args)
{
...
}
}
已经存在的MulticastAttributeUsageAttribute应该满足上面的标准1,但是我不知道如何满足标准2,而不是简单地将现有方面的行为复制到新属性中.
如何将此方面应用于标记有DoSpecialFunctionAttribute的任何方法,无论成员可访问性如何(public / protected / private / whatever)？
解决方法
这是解决方案：
>使用[MulticastAttributeUsage(MulticastTargets.Method)]定位所有方法
>覆盖CompileTimeValidate(MethodBase方法).设置返回值,使得CompileTimeValidate在适当的目标上返回true,在目标上为false以静默忽略,并在应警告用户Aspect使用不合适时抛出异常(这在PostSharp documentation中详述).
在代码中：
[Serializable]
[MulticastAttributeUsage(MulticastTargets.Method)]
[AttributeUsage(AttributeTargets.Class)]
public class RunOutOfProcessAttribute : MethodInterceptionAspect
{
protected static bool IsOutOfProcess;
public override void OnInvoke(MethodInterceptionArgs args)
{
...
}
public override bool CompileTimeValidate(MethodBase method)
{
if (method.DeclaringType.GetInterface("IDisposable") == null)
throw new InvalidAnnotationException("Class must implement IDisposable " + method.DeclaringType);
if (!method.Attributes.HasFlag(MethodAttributes.Public) && //if method is not public
!MethodMarkedWith(method,typeof(InitializerAttribute))) //method is not initialiser
return false; //silently ignore.
return true;
}
}
