替代嵌套类型 Expression<Func<T>>

问题描述

我在调用服务时使用了一个函数.在调用服务之前，它会创建一个日志条目:

I have a function used when calling a service. Before it call the service, it will create a log entry:

protected TResult CallService<TService, TResult>(TService service,
    Expression<Func<TService, TResult>> functionSelector)
{
    Logger.LogServiceCall(service, functionSelector);
    return functionSelector.Compile()(service);
}

Visual Studio 2010 代码分析器在以下消息中通知我不应使用嵌套类型:

The Visual Studio 2010 Code Analyzer informs me that I shouldn't use Nested Type in the following message:

CA1006:Microsoft.Design:考虑一个设计在哪里'ServiceManager.CallService(TService,表达式<Func<TService, TResult>>)'不嵌套泛型类型'Expression'.

CA1006 : Microsoft.Design : Consider a design where 'ServiceManager.CallService<TService, Result>(TService, Expression<Func<TService, TResult>>)' doesn't nest generic type 'Expression<Func<TService, TResult>>'.

虽然我可以简单地为该条目创建一个禁止规则，但是否存在可以阻止显示此类警告的替代方法?

While I could simply create a suppression rule for this entry, is there is an alternative that exist that would prevent displaying such warning?

推荐答案

在这种情况下我会抑制它，原因是调用者不必处理嵌套泛型，他只是传递一个 lambda 表达式，它易于使用.

I would suppress it in this case, with the reason that the caller doesn't have to cope with nested generics, he is just passing a lambda expression, which is easy to use.

CA 不会为 lambda 表达式设置例外.有时最好是抑制它然后编写奇怪的代码.

CA does not make exceptions for lambda expressions. Sometimes It is better to suppress it then to write weird code.