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 == 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 <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);
}
}
}
}
}
}