如何正确关闭连接与 WNetCancelConnection2.

我想访问共享并在需要时取消访问权限。我使用以下代码：

class Program
{
    const string Share = "''''srv''share";
    static void ListFiles()
    {
        foreach (var dir in Directory.EnumerateDirectories(Share))
            Console.WriteLine(dir);
    }
    static void Main(string[] args)
    {
        using (var connection = new NetworkConnection(Share, new System.Net.NetworkCredential("user", "password")))
            ListFiles();
        ListFiles();
    }
}

第一个列表文件（） 调用成功。我希望第二个 ListFiles（） 调用失败，但它也会成功。如何正确取消连接？似乎 WNetCancelConnection2 不起作用。

这里也有说明。我想知道是否有人能让它工作。

FIY 下面是一个网络连接类：

public class NetworkConnection : IDisposable
{
    string _networkName;
    public NetworkConnection(string networkName,
        NetworkCredential credentials)
    {
        _networkName = networkName;
        var netResource = new NetResource()
        {
            Scope = ResourceScope.GlobalNetwork,
            ResourceType = ResourceType.Disk,
            DisplayType = ResourceDisplaytype.Share,
            RemoteName = networkName
        };
        var userName = string.IsNullOrEmpty(credentials.Domain)
            ? credentials.UserName
            : string.Format(@"{0}'{1}", credentials.Domain, credentials.UserName);
        var result = WNetAddConnection2(
            netResource,
            credentials.Password,
            userName,
            0);
        if (result != 0)
        {
            throw new Win32Exception(result, "Error connecting to remote share");
        }
    }
    ~NetworkConnection()
    {
        Dispose(false);
    }
    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
    protected virtual void Dispose(bool disposing)
    {
        WNetCancelConnection2(_networkName, 0, true);
    }
    [DllImport("mpr.dll")]
    private static extern int WNetAddConnection2(NetResource netResource,
        string password, string username, int flags);
    [DllImport("mpr.dll")]
    private static extern int WNetCancelConnection2(string name, int flags,
        bool force);
}
[StructLayout(LayoutKind.Sequential)]
public class NetResource
{
    public ResourceScope Scope;
    public ResourceType ResourceType;
    public ResourceDisplaytype DisplayType;
    public int Usage;
    public string LocalName;
    public string RemoteName;
    public string Comment;
    public string Provider;
}
public enum ResourceScope : int
{
    Connected = 1,
    GlobalNetwork,
    Remembered,
    Recent,
    Context
};
public enum ResourceType : int
{
    Any = 0,
    Disk = 1,
    Print = 2,
    Reserved = 8,
}
public enum ResourceDisplaytype : int
{
    Generic = 0x0,
    Domain = 0x01,
    Server = 0x02,
    Share = 0x03,
    File = 0x04,
    Group = 0x05,
    Network = 0x06,
    Root = 0x07,
    Shareadmin = 0x08,
    Directory = 0x09,
    Tree = 0x0a,
    Ndscontainer = 0x0b
}