不能引用来自匿名方法非静态方法 [英] can't reference non-static method from anonymous method

问题描述

我需要从一个异步操作调用非静态方法， 为便于我使用APM设计，通​​过定义一个委托给它分配一个匿名方法 并呼吁BeginInvoke的就可以了。

i need to call a non-static method from an async operation , for ease i'm using apm design , by defining a delegate assign it an anonymous method and calling beginInvoke on it .

让我吃惊我无法从我的执行引用非静态方法

to my surprise i could not reference a non-static method from my implementation

任何想法，这是为什么？

any idea why that is ?

public delegate void UpdatePlayersLogin(IServerCallback callback, Guid callback_playerId, Player player, List<IServerCallback> toRemove, ManualResetEvent handel);

[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Reentrant , InstanceContextMode = InstanceContextMode.PerSession)]
public class ServerService : IServer
{

    UpdatePlayersLogin updateLogin = (callback, callback_playerId, player, toRemove, handle) =>
    {
        try
        {
            callback.PlayerChangedStatus(player);
        }
        catch (Exception)
        {
            RemovePlayer(callback, callback_playerId, toRemove);
        }
        finally
        {
            handle.Set();
        }
    };

    .
    .
    private void RemovePlayer(IServerCallback callback, Guid playerId, List<IServerCallback> toRemove)
    { . . . . . . }

    private void NotifyPeersOfClientLogin(Player player)
    {
        . . . . .   
         foreach (var key_CallBackPair in players)
         {
                handels[i] = new ManualResetEvent(false);
                updateLogin.BeginInvoke(key_CallBackPair.Value, key_CallBackPair.Key, player, toRemove, handels[i], null, null);                     
                . . . . .
         }
        ..... 
    }

有没有办法我可以引用非静态方法？

is there a way i could reference the non-static method ?

推荐答案

这应该是罚款，如果在lambda EX pression本身是一个实例方法内......但如果​​它在一个静态方法，那么什么情况下做你期望 RemovePlayer 被称为呢？

That should be fine if the lambda expression itself is within an instance method... but if it's in a static method, then what instance do you expect RemovePlayer to be called on?

（顺便说一句， update_players_login 是一个非常非常规的类型名称。 UpdatePlayersLogin 会更好。）

(As an aside, update_players_login is a highly unconventional type name. UpdatePlayersLogin would be better.)

编辑：好的，我的猜测是，你声明的实例变量，像这样的：

Okay, my guess is that you're declaring an instance variable, like this:

class SomeClass
{
    Action action = () => Foo();

    void Foo()
    {
    }
}

如果这不是这种情况，请说明你的帖子，因为它缺少的那一刻的重要信息。

If that's not the case, please clarify your post, because it's missing important information at the moment.

如果说的是的情况下，这个问题就是这样一个实例变量初始化器不能引用这 ...但你可以在构造函数初始化，而不是：

If that is the case, the problem is just that an instance variable initializer can't refer to this... but you can initialize it in the constructor instead:

class SomeClass
{
    Action action;

    public SomeClass()
    {
        action = () => Foo();
    }

    void Foo()
    {
    }
}

我也会让现场只读除非你打算重新分配到其他地方。

I would also make the field readonly unless you intend to reassign it somewhere else.

这篇关于不能引用来自匿名方法非静态方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！