如何拦截，跳过方法执行并继续堆栈的其余部分

Question

有没有办法拦截方法调用，查找条件并跳过执行？该方法不返回任何内容，我想将其视为已成功完成并继续执行堆栈的其余部分。

public IMessageSink NextSink {
    get { return m_next; }
}

public IMessage SyncProcessMessage(IMessage msg) {
    if (//some condition is met) {
        // should skip the method execution
    } else {
        IMessage returnMethod = m_next.SyncProcessMessage(msg);
        return returnMethod;
    }
}

Answer 1

return语句终止方法的执行。在这种情况下，您应该使用return null，因为SyncProcessMessage()必须返回IMessage的值

public IMessage SyncProcessMessage(IMessage msg) {
    if (//some condition is met) {
        return null;
    } else {
        IMessage returnMethod = m_next.SyncProcessMessage(msg);
        return returnMethod;
    }
}

或类似的东西：

public IMessage SyncProcessMessage(IMessage msg) {
    IMessage returnMethod  = null;
    if (! //not some condition is met) {
        returnMethod = m_next.SyncProcessMessage(msg);            
    }
    return returnMethod;
}