我正在尝试使用类似这样的方法在“ C：\”文件夹中找到文件：
var allFiles = Directory.GetFiles("C:\\", "VBoxManage.exe", SearchOption.AllDirectories);
如果我不尝试读取需要管理员权限的目录，则代码可以正常工作。我在app.manifest中添加了以下行：
<requestedExecutionLevel level="highestAvailable" uiAccess="false" />
该应用在运行时会要求管理员特权，但仍然会出现这样的错误：
System.UnauthorizedAccessException: 'Permission to 'C:\Documents and Settings' denied.'
有什么建议吗？
我写了这些扩展方法来处理无法访问的文件和文件夹的跳跳：
public static class SafeWalk {
[Flags]
public enum ReturnOptions {
ReturnFiles = 1, ReturnDirectories = 2, ReturnBoth = 3
}
const string AllFiles = "*.*";
// File and Directory Name Tree Walkers
public static IEnumerable<string> SafeEnumerateFileAndDirNames(this DirectoryInfo di, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
di.FullName.SafeEnumerateFileAndDirNames(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnBoth);
public static IEnumerable<string> SafeEnumerateFileAndDirNames(this DirectoryInfo di, string filePattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
di.FullName.SafeEnumerateFileAndDirNames(filePattern, AllFiles, searchOpt, ReturnOptions.ReturnBoth);
public static IEnumerable<string> SafeEnumerateFileAndDirNames(this DirectoryInfo di, string filePattern, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
di.FullName.SafeEnumerateFileAndDirNames(filePattern, dirPattern, searchOpt, ReturnOptions.ReturnBoth);
public static IEnumerable<string> SafeEnumerateFileAndDirNames(this string path, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.SafeEnumerateFileAndDirNames(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnBoth);
public static IEnumerable<string> SafeEnumerateFileAndDirNames(this string path, string filePattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.SafeEnumerateFileAndDirNames(filePattern, AllFiles, searchOpt, ReturnOptions.ReturnBoth);
public static IEnumerable<string> SafeEnumerateFileAndDirNames(this string path, string filePattern, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly, ReturnOptions returnOpt = ReturnOptions.ReturnBoth) {
var searchQueue = new Queue<string>() { path };
while (searchQueue.Count > 0) {
var cdn = searchQueue.Dequeue();
IEnumerable<string> cdiFiles = null;
if (returnOpt.HasFlag(ReturnOptions.ReturnFiles)) {
try {
cdiFiles = Directory.EnumerateFiles(cdn, filePattern, SearchOption.TopDirectoryOnly);
}
catch (Exception) {
}
if (cdiFiles != null)
foreach (var filename in cdiFiles)
yield return filename;
}
if ((!returnOpt.HasFlag(ReturnOptions.ReturnFiles) || cdiFiles != null) && (returnOpt.HasFlag(ReturnOptions.ReturnDirectories) || searchOpt.HasFlag(SearchOption.AllDirectories))) { // skip if file enumeration failed
IEnumerable<string> cdiDirs = null;
try {
cdiDirs = Directory.EnumerateDirectories(cdn, dirPattern, SearchOption.TopDirectoryOnly);
}
catch (Exception) {
}
if (cdiDirs != null) {
foreach (var dirname in cdiDirs) {
if (searchOpt == SearchOption.AllDirectories)
searchQueue.Enqueue(dirname);
if (returnOpt.HasFlag(ReturnOptions.ReturnDirectories))
yield return dirname;
}
}
}
}
}
public static IEnumerable<string> SafeEnumerateFileNames(this string path, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.SafeEnumerateFileAndDirNames(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnFiles);
public static IEnumerable<string> SafeEnumerateFileNames(this string path, string filePattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.SafeEnumerateFileAndDirNames(filePattern, AllFiles, searchOpt, ReturnOptions.ReturnFiles);
public static IEnumerable<string> SafeEnumerateFileNames(this string path, string filePattern, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.SafeEnumerateFileAndDirNames(filePattern, dirPattern, searchOpt, ReturnOptions.ReturnFiles);
public static IEnumerable<string> SafeEnumerateFileNames(this DirectoryInfo path, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.FullName.SafeEnumerateFileAndDirNames(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnFiles);
public static IEnumerable<string> SafeEnumerateFileNames(this DirectoryInfo path, string filePattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.FullName.SafeEnumerateFileAndDirNames(filePattern, AllFiles, searchOpt, ReturnOptions.ReturnFiles);
public static IEnumerable<string> SafeEnumerateFileNames(this DirectoryInfo path, string filePattern, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.FullName.SafeEnumerateFileAndDirNames(filePattern, dirPattern, searchOpt, ReturnOptions.ReturnFiles);
public static IEnumerable<string> SafeEnumerateDirectoryNames(this string path, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.SafeEnumerateFileAndDirNames(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnDirectories);
public static IEnumerable<string> SafeEnumerateDirectoryNames(this string path, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.SafeEnumerateFileAndDirNames(AllFiles, dirPattern, searchOpt, ReturnOptions.ReturnDirectories);
public static IEnumerable<string> SafeEnumerateDirectoryNames(this DirectoryInfo path, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.FullName.SafeEnumerateFileAndDirNames(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnDirectories);
public static IEnumerable<string> SafeEnumerateDirectoryNames(this DirectoryInfo path, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
path.FullName.SafeEnumerateFileAndDirNames(AllFiles, dirPattern, searchOpt, ReturnOptions.ReturnDirectories);
// File and Directory Info Tree Walkers
public static IEnumerable<FileSystemInfo> SafeEnumerateFileSystemInfos(this string path, SearchOption searchOpt = SearchOption.TopDirectoryOnly, ReturnOptions returnOpt = ReturnOptions.ReturnBoth) =>
new DirectoryInfo(path).SafeEnumerateFileSystemInfos(AllFiles, AllFiles, searchOpt, returnOpt);
public static IEnumerable<FileSystemInfo> SafeEnumerateFileSystemInfos(this string path, string searchPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly, ReturnOptions returnOpt = ReturnOptions.ReturnBoth) =>
new DirectoryInfo(path).SafeEnumerateFileSystemInfos(searchPattern, searchPattern, searchOpt, returnOpt);
public static IEnumerable<FileSystemInfo> SafeEnumerateFileSystemInfos(this string path, string filePattern, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly, ReturnOptions returnOpt = ReturnOptions.ReturnBoth) =>
new DirectoryInfo(path).SafeEnumerateFileSystemInfos(filePattern, dirPattern, searchOpt, returnOpt);
public static IEnumerable<FileSystemInfo> SafeEnumerateFileSystemInfos(this DirectoryInfo di, SearchOption searchOpt = SearchOption.TopDirectoryOnly, ReturnOptions returnOpt = ReturnOptions.ReturnBoth) =>
di.SafeEnumerateFileSystemInfos(AllFiles, AllFiles, searchOpt, returnOpt);
public static IEnumerable<FileSystemInfo> SafeEnumerateFileSystemInfos(this DirectoryInfo di, string searchPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly, ReturnOptions returnOpt = ReturnOptions.ReturnBoth) =>
di.SafeEnumerateFileSystemInfos(searchPattern, searchPattern, searchOpt, returnOpt);
public static IEnumerable<FileSystemInfo> SafeEnumerateFileSystemInfos(this DirectoryInfo di, string filePattern, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly, ReturnOptions returnOpt = ReturnOptions.ReturnBoth) {
var searchQueue = new Queue<DirectoryInfo>();
searchQueue.Enqueue(di);
while (searchQueue.Count > 0) {
var cdi = searchQueue.Dequeue();
IEnumerable<string> cdiFiles = null;
if (returnOpt.HasFlag(ReturnOptions.ReturnFiles)) {
try {
cdiFiles = Directory.EnumerateFiles(cdi.FullName, filePattern, SearchOption.TopDirectoryOnly);
}
catch (Exception) {
}
if (cdiFiles != null) {
var cfis = new ConcurrentBag<FileInfo>();
cdiFiles.AsParallel()
.ForAll(f => {
try {
cfis.Add(new FileInfo(f));
}
catch (Exception) {
}
});
foreach (var fi in cfis)
yield return fi;
}
}
if ((!returnOpt.HasFlag(ReturnOptions.ReturnFiles) || cdiFiles != null) && (returnOpt.HasFlag(ReturnOptions.ReturnDirectories) || searchOpt.HasFlag(SearchOption.AllDirectories))) { // skip if file enumeration failed
IEnumerable<string> cdiDirs = null;
try {
cdiDirs = Directory.EnumerateDirectories(cdi.FullName, dirPattern, SearchOption.TopDirectoryOnly);
}
catch (Exception) {
}
if (cdiDirs != null) {
var cdis = new ConcurrentBag<DirectoryInfo>();
cdiDirs.AsParallel()
.ForAll(d => {
try {
cdis.Add(new DirectoryInfo(d));
}
catch (Exception) {
}
});
foreach (var rdi in cdis) {
if (returnOpt.HasFlag(ReturnOptions.ReturnDirectories))
yield return rdi;
if (searchOpt == SearchOption.AllDirectories)
searchQueue.Enqueue(rdi);
}
}
}
}
}
public static IEnumerable<FileInfo> SafeEnumerateFileInfos(this string path, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
new DirectoryInfo(path).SafeEnumerateFileSystemInfos(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnFiles).Cast<FileInfo>();
public static IEnumerable<FileInfo> SafeEnumerateFileInfos(this string path, string filePattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
new DirectoryInfo(path).SafeEnumerateFileSystemInfos(filePattern, AllFiles, searchOpt, ReturnOptions.ReturnFiles).Cast<FileInfo>();
public static IEnumerable<FileInfo> SafeEnumerateFileInfos(this string path, string filePattern, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
new DirectoryInfo(path).SafeEnumerateFileSystemInfos(filePattern, dirPattern, searchOpt, ReturnOptions.ReturnFiles).Cast<FileInfo>();
public static IEnumerable<FileInfo> SafeEnumerateFileInfos(this DirectoryInfo di, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
di.SafeEnumerateFileSystemInfos(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnFiles).Cast<FileInfo>();
public static IEnumerable<FileInfo> SafeEnumerateFileInfos(this DirectoryInfo di, string filePattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
di.SafeEnumerateFileSystemInfos(filePattern, AllFiles, searchOpt, ReturnOptions.ReturnFiles).Cast<FileInfo>();
public static IEnumerable<FileInfo> SafeEnumerateFileInfos(this DirectoryInfo di, string filePattern, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
di.SafeEnumerateFileSystemInfos(filePattern, dirPattern, searchOpt, ReturnOptions.ReturnFiles).Cast<FileInfo>();
public static IEnumerable<DirectoryInfo> SafeEnumerateDirectoryInfos(this string path, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
new DirectoryInfo(path).SafeEnumerateFileSystemInfos(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnDirectories).Cast<DirectoryInfo>();
public static IEnumerable<DirectoryInfo> SafeEnumerateDirectoryInfos(this string path, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
new DirectoryInfo(path).SafeEnumerateFileSystemInfos(AllFiles, dirPattern, searchOpt, ReturnOptions.ReturnDirectories).Cast<DirectoryInfo>();
public static IEnumerable<DirectoryInfo> SafeEnumerateDirectoryInfos(this DirectoryInfo di, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
di.SafeEnumerateFileSystemInfos(AllFiles, AllFiles, searchOpt, ReturnOptions.ReturnDirectories).Cast<DirectoryInfo>();
public static IEnumerable<DirectoryInfo> SafeEnumerateDirectoryInfos(this DirectoryInfo di, string dirPattern, SearchOption searchOpt = SearchOption.TopDirectoryOnly) =>
di.SafeEnumerateFileSystemInfos(AllFiles, dirPattern, searchOpt, ReturnOptions.ReturnDirectories).Cast<DirectoryInfo>();
}
有了这些定义，您可以做：
var ans = @"C:\".SafeEnumerateFileNames("VBoxManage.exe", SearchOption.AllDirectories);