如何（快速）检查UNC路径可 [英] How to (quickly) check if UNC Path is available

问题描述

我如何检查是否UNC路径可用？
我有一个检查过程约半分钟，如果份额的不可以可用的问题：

How can I check if a UNC Path is available? I have the problem that the check takes about half a minute if the share is not available :

var fi = new DirectoryInfo(@"\\hostname\samba-sharename\directory");

if (fi.Exists)
//...

有没有检查，如果一个文件夹可用更快的方法？
我使用Windows XP和C＃。

Is there a faster way to check if a folder is available? I'm using Windows XP and C#.

推荐答案

这个怎么样的一个快速和肮脏的方法来检查 - 运行Windows NET USE 命令和解析对于感兴趣的网络路径的线路输出（如 \\\\ vault2 ）和确定。下面是输出的一个例子：

How's this for a quick and dirty way to check - run the windows net use command and parse the output for the line with the network path of interest (e.g. \\vault2) and OK. Here's an example of the output:

C:\>net use
New connections will be remembered.

Status       Local     Remote                    Network

-------------------------------------------------------------------------------
OK           O:        \\smarty\Data       Microsoft Windows Network
Disconnected P:        \\dummy\Data       Microsoft Windows Network
OK                     \\vault2\vault2           Microsoft Windows Network
The command completed successfully.

这不是一个很.netish的解决方案，但它的速度非常快，有时是更重要： - ）

It's not a very .netish solution, but it's very fast, and sometimes that matters more :-).

和这里的code做它（LINQPad告诉我，只需要 150ms的，所以这是很好的）

And here's the code to do it (and LINQPad tells me that it only takes 150ms, so that's nice)

void Main()
{
    bool available = QuickBestGuessAboutAccessibilityOfPath(@"\\vault2\vault2\dir1\dir2");
    Console.WriteLine(available);
}

public static bool QuickBestGuessAboutAccessibilityOfNetworkPath(string path)
{
    if (string.IsNullOrEmpty(path)) return false;
    string pathRoot = Path.GetPathRoot(path);
    if (string.IsNullOrEmpty(pathRoot)) return false;
    ProcessStartInfo pinfo = new ProcessStartInfo("net", "use");
    pinfo.CreateNoWindow = true;
    pinfo.RedirectStandardOutput = true;
    pinfo.UseShellExecute = false;
    string output;
    using (Process p = Process.Start(pinfo)) {
        output = p.StandardOutput.ReadToEnd();
    }
    foreach (string line in output.Split('\n'))
    {
        if (line.Contains(pathRoot) && line.Contains("OK"))
        {
            return true; // shareIsProbablyConnected
        }
    }
    return false;
}

或者，你也许可以去使用 WMI ，如提到的<一个HREF =htt​​p://stackoverflow.com/a/8993155/116891>这个答案以<一个href=\"http://stackoverflow.com/questions/8876022/how-to-ensure-network-drives-are-connected-for-an-application\">How确保网络驱动器连接为一个应用程序？

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