In my application, I have option to search a directory. If the user searching local drive then I'm searching the catalog first (searching the Index), then the directories
DirectoryInfo.GetDirectories("*" + AsearchString + "*",System.IO.SearchOption.AllDirectories).
In case of network searching (network folders), I am doing only directory search. Now the problem is, the user may or may not have access permission for files or folders. I am getting unauthorized exception and background worker stops right there, my confusion is how I can catch the exception (in case of PathTooLong or unauthorized exception, this happens when I am searching network drives ) so if there is an exception just log or omit it and continue working.
I am putting my work around below, I don't know why try/catch not working, or where I should move it so in case of exception it will disregard and keep going. I had to put the lots of code below, apologies for that, I appreciate any suggestions.
UPDATE: Ignoring the exception in do work will stop the bcw, so I figured out my exception handling was incorrect. I have updated my code.
private void bwSearch_DoWork(object sender, DoWorkEventArgs e)
{
if (e.Argument != null && e.Argument.GetType() == typeof(List<string>))
{
if (this.InvokeRequired)
{
this.BeginInvoke(new Action(() => this.Cursor = Cursors.WaitCursor));
}
else
{
this.Cursor = Cursors.WaitCursor;
}
listViewBWSearchStatus = true;
List<string> par = e.Argument as List<string>;
string path = par[0];
string searchString = par[1];
try
{
if (FileSystemHelper.PathIsNetworkPath(path))
{
DirectoryInfo dInfo = new DirectoryInfo(path);
foreach (FileInfo fi in dInfo.GetFiles("*" + searchString + "*.*", System.IO.SearchOption.AllDirectories))
{
if (bwSearch.CancellationPending)
{
e.Cancel = true;
if (this.InvokeRequired)
{
this.BeginInvoke(new Action(() => this.Cursor = Cursors.Default));
}
else
{
this.Cursor = Cursors.Default;
}
break;
}
bwSearch.ReportProgress(0, fi);
}
foreach (DirectoryInfo d in dInfo.GetDirectories("*" + searchString + "*", System.IO.SearchOption.AllDirectories))
{
if (bwSearch.CancellationPending)
{
e.Cancel = true;
break;
}
bwSearch.ReportProgress(0, d);
}
}
else
{
var connection = new OleDbConnection(@"Provider=Search.CollatorDSO;Extended Properties=""Application=Windows""");
string searchDirectoryFormated = path.Replace(@"\", @"/");
// Folder name search (case insensitive), does not search sub directories
var directorySearchQuery = @"SELECT System.ItemName,System.ItemPathDisplay FROM SystemIndex " +
@"WHERE directory = 'file:" + searchDirectoryFormated + "' AND System.ItemType = 'Directory' AND System.Itemname LIKE '%" + searchString + "%' ";
// File name search (case insensitive), does not search sub directories
var fileSearchQuery = @"SELECT System.ItemName,System.ItemPathDisplay FROM SystemIndex " +
@"WHERE directory = 'file:" + searchDirectoryFormated + "' AND System.ItemName LIKE '%" + searchString + "%' ";
connection.Open();
var command = new OleDbCommand(directorySearchQuery, connection);
Dictionary<string, string> directoryResult = new Dictionary<string, string>();
using (var r = command.ExecuteReader())
{
while (r.Read())
{
if (bwSearch.CancellationPending)
{
e.Cancel = true;
break;
}
if (!directoryResult.ContainsKey(r.GetString(1)))
{
directoryResult.Add(r.GetString(1), r.GetString(0));
DirectoryInfo dirInfoIndexed = new DirectoryInfo(r.GetString(1));
bwSearch.ReportProgress(0, dirInfoIndexed);
}
}
}
command = new OleDbCommand(fileSearchQuery, connection);
Dictionary<string, string> fileResult = new Dictionary<string, string>();
using (var r = command.ExecuteReader())
{
while (r.Read())
{
if (bwSearch.CancellationPending)
{
e.Cancel = true;
break;
}
if (!fileResult.ContainsKey(r.GetString(1)))
{
fileResult.Add(r.GetString(1), r.GetString(0));
FileInfo fileInfoIndexed = new FileInfo(r.GetString(1));
bwSearch.ReportProgress(0, fileInfoIndexed);
}
}
}
connection.Close();
DirectoryInfo dInfo = new DirectoryInfo(path);
foreach (DirectoryInfo d in dInfo.GetDirectories("*" + searchString + "*", System.IO.SearchOption.AllDirectories))
{
if (bwSearch.CancellationPending)
{
e.Cancel = true;
break;
}
bwSearch.ReportProgress(0, d);
}
foreach (FileInfo fi in dInfo.GetFiles("*" + searchString + "*.*", System.IO.SearchOption.AllDirectories))
{
if (bwSearch.CancellationPending)
{
e.Cancel = true;
break;
}
bwSearch.ReportProgress(0, fi);
}
}
}
//catch (UnauthorizedAccessException) { } // ignoring the exception will stop the background worker
catch (UnauthorizedAccessException) { throw;}
catch (System.Exception )
{
throw;// new Exception(ex.Message);
}
}
}
private void bwSearch_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
if (e.UserState != null && e.UserState.GetType() == typeof(FileInfo))
{
FileInfo fInfo = e.UserState as FileInfo;
ListViewItem[] searchInfo = this.listView.Items.Find(Path.GetFileNameWithoutExtension(fInfo.Name), false);
if (searchInfo == null || searchInfo.Count() == 0)
{
string fileFullName = fInfo.FullName;
string lastAccessTime = fInfo.LastAccessTime.ToShortDateString();
string imageKey = "";
if (this.listView.SmallImageList.Images.ContainsKey(fInfo.Extension.ToLower()))
imageKey = fInfo.Extension.ToLower();
else
imageKey = Explorer._Unknown;
string strFileType = Explorer._Unknown;
fileExtensionToFileType.TryGetValue(fInfo.Extension.ToString(), out strFileType);
if (String.IsNullOrWhiteSpace(strFileType))
strFileType = Explorer._Unknown;
ListViewItem itemL = new ListViewItem(Path.GetFileNameWithoutExtension(fInfo.Name), imageKey);
itemL.Name = fInfo.Name;
itemL.Tag = fInfo;
ListViewItem.ListViewSubItem[] subItem = new ListViewItem.ListViewSubItem[]
{
new ListViewItem.ListViewSubItem(itemL, lastAccessTime),
new ListViewItem.ListViewSubItem(itemL, strFileType),
new ListViewItem.ListViewSubItem(itemL, Explorer.SizeSuffix(fInfo.Length)),
new ListViewItem.ListViewSubItem(itemL, fileFullName)
};
itemL.SubItems.AddRange(subItem);
this.BeginInvoke(new MethodInvoker(delegate
{
this.listView.BeginUpdate();
this.listView.Items.Add(itemL);
this.listView.EndUpdate();
}));
}
}
else if (e.UserState != null && e.UserState.GetType() == typeof(DirectoryInfo))
{
DirectoryInfo dInfo = e.UserState as DirectoryInfo;
string fullName = dInfo.FullName;
ListViewItem[] searchDirectories = this.listView.Items.Find(dInfo.Name, false);
if (searchDirectories == null || searchDirectories.Count() == 0)
{
ListViewItem itemL = new ListViewItem(dInfo.Name, Strings.FolderOpen);
itemL.Name = dInfo.Name;
itemL.Tag = dInfo;
ListViewItem.ListViewSubItem[] subItem = new ListViewItem.ListViewSubItem[]
{
new ListViewItem.ListViewSubItem(itemL, dInfo.LastAccessTime.ToShortDateString()),
new ListViewItem.ListViewSubItem(itemL, "File folder"),
new ListViewItem.ListViewSubItem(itemL, ""),
new ListViewItem.ListViewSubItem(itemL, fullName)
};
itemL.SubItems.AddRange(subItem);
this.BeginInvoke(new MethodInvoker(delegate
{
this.listView.BeginUpdate();
this.listView.Items.Add(itemL);
this.listView.EndUpdate();
}));
}
}
}
private void bwSearch_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Error != null)
{
if (e.Error.GetType() == typeof(UnauthorizedAccessException))
{
}
if (e.Error.GetType() == typeof(Exception))
{ }
}
if (e.Error == null && e.Cancelled == false)
{
_ResetEventSearch.Set();
listViewBWSearchStatus = false;
if (this.InvokeRequired)
{
this.BeginInvoke(new Action(() => this.Cursor = Cursors.Default));
}
else
{
this.Cursor = Cursors.Default;
}
}
}
UPDATE :
This part of the code searches for files or folders based on the user defined string. I didn't want to stall users thread since searching will be a pile load of work, so I introduced background worker instead. I got exception when I was trying to read directories in foreach (DirectoryInfo d in dInfo.GetDirectories("*" + searchString + "*", System.IO.SearchOption.AllDirectories)). I think, when It was trying to get directory info or file info, it got stuck since user didn't had access permission.
Initially I wasn't throwing exception, hence, after getting the exception the bcw didn't move further. Instead it reported error and raised run worker completed event. After I have added throw bcw continued working for the rest of the directories.