c# – Cargo-cult编程：锁定System.Object

每当我需要创建一个类线程安全时,例如一个具有Dictionary或List的类(完全封装：永远不会直接访问并仅由我的类的成员方法修改),我创建了两个对象,如下所示：

public static class Recorder {

    private static readonly Object _devicesLock = new Object();
    private static readonly Dictionary<String,DeviceRecordings> _devices;

    static Recorder() {

        _devices = new Dictionary<String,DeviceRecordings>();

        WaveInCapabilities[] devices = AudioManager.GetInDevices();
        foreach(WaveInCapabilities device in devices) {

            _devices.Add( device.ProductName,new DeviceRecordings( device.ProductName ) );
        }
    }//cctor

    // For now,only support a single device.

    public static DeviceRecordings GetRecordings(String deviceName) {

        lock( _devicesLock ) {

            if( !_devices.ContainsKey( deviceName ) ) {

                return null;
            }

            return _devices[ deviceName ];
        }
    }//GetRecordings
}//class

在这种情况下,我将所有操作包装在一个锁(_devicesLock){block中的_devices上.我开始怀疑这是否必要.为什么我不直接锁定字典？