在LINQ C＃拉手System.UnauthorizedAccessException的 [英] C# Handle System.UnauthorizedAccessException in LINQ

问题描述

我使用下面的LINQ查询，以获得目录列表。我得到一个错误（System.UnauthorizedAccessException的是由用户代码未处理）。如何加载只对那些我曾访问的目录。

I am using below LINQ query to get the directory list. I am getting an error (System.UnauthorizedAccessException was unhandled by user code). How to load only the directories to which I have access to.

var files = from f in System.IO.Directory.GetDirectories(@"\\testnetwork\abc$",
                                   "*.*",
                                   SearchOption.AllDirectories)
            select System.IO.Path.GetDirectoryName(f);

错误：

Error:

访问路径\testnetwork\abc $ \DemoFolder\'被拒绝。

Access to the path '\testnetwork\abc$\DemoFolder\' is denied.

推荐答案

使用捕捉赶上UnauthorizedAccessException。

Catch the UnauthorizedAccessException using Catch. .

  string[] directories = Directory.EnumerateDirectories(@"\\testnetwork\abc$","*.*", SearchOption.AllDirectories).Catch(typeof(UnauthorizedAccessException)).ToArray();

ExceptionExtensions：

ExceptionExtensions:

   static class ExceptionExtensions
{
public static IEnumerable<TIn> Catch<TIn>(
            this IEnumerable<TIn> source,
            Type exceptionType)
{   
    using (var e = source.GetEnumerator())
    while (true)
    {
        var ok = false;

        try
        {
            ok = e.MoveNext();
        }
        catch(Exception ex)
        {
            if (ex.GetType() != exceptionType)
                throw;
            continue;
        }

        if (!ok)
            yield break;

        yield return e.Current;
    }
}
}

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