My WPF app is using the Microsoft.Win32.OpenFileDialog to select a SQL Server 2008 database to open.
It works OK but for one issue: When the database selected in the dialog was previously opened at some time since last boot, the file seems to be held open by SQL server in the background (even when it is not opened by my app and my app has been restarted). This causes a "file is used by another application" warning when OK is clicked in the OpenFileDialog and i can not use the dialog to open that particular database until the computer is rebooted. It seems the OpenFileDialog tries to open the file selected and doing that discovers that it is already opened by another app (SQL Server). How do i disable the OpenFileDialog from trying to open the selected file and just return the filename of the selected file without any checks?
My code looks like this:
public void OpenDatabase() {
// Let user select database to open from file browser dialog
// Configure open file dialog box
var dlg = new Microsoft.Win32.OpenFileDialog();
dlg.FileName = ""; // Default file name
dlg.DefaultExt = ".mdf"; // Default file extension
dlg.Filter = "Databases (.mdf)|*.mdf|All Files|*.*"; // Filter files by extension
dlg.CheckFileExists = false;
dlg.CheckPathExists = false;
// Show open file dialog box
bool? result = dlg.ShowDialog(); // Gives file in use warning second time!
// Process open file dialog box results
if (result == true) {
// Open document
string filename = dlg.FileName;
TryOpenDatabase(filename);
}
}
The underlying option is OFN_NOVALIDATE for early Windows versions, FOS_NOVALIDATE for the Vista dialog you get on later versions of Windows and .NET. The description from MSDN:
Do not check for situations that would prevent an application from opening the selected file, such as sharing violations or access denied errors.
Which is what you see happening now, the dialog sees a sharing violation on the database file. This option is in fact exposed on the OpenFileDialog wrapper class, add this line of code to fix your problem:
dlg.ValidateNames = false;
The MSDN forum has a post about this
It is in the OpenFileDialog API, you can turn that off using
ValidateNames = false
on the Dialog.
Related
I want to open a PDF with the default windows behaviour the user has saved (e.g. internet explorer, adobe, whatever).
I found this solution
Opening a .pdf file in windows form through a button click
and implemented it here:
ProcessStartInfo startInfo = new ProcessStartInfo("MyPdfPath");
Process.Start(startInfo);
Sadly I got an Error:
System.ComponentModel.Win32Exception: "The specified executable is not a valid application for this OS platform."
I tried to google this error, but nothing of the first ten solution ideas worked.
The system is treating it like an executable, one way to get the document behavior is to set UseShellExecute to true:
ProcessStartInfo startInfo = new ProcessStartInfo("MyPdfPath");
startInfo.UseShellExecute = true;
Process.Start(startInfo);
I recently started doing some WPF windows 8.1 apps and now I searched for a open file dialog. Some information is available at Microsoft and some blogs but the results are not that great.
Tried these lines:
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.FileName = "Document"; // Default file name
dlg.DefaultExt = ".txt"; // Default file extension
dlg.Filter = "Text documents (.txt)|*.txt"; // Filter files by extension
// Show open file dialog box
Nullable<bool> result = dlg.ShowDialog();
// Process open file dialog box results
if (result == true)
{
// Open document
string filename = dlg.FileName;
}
This should work greatly as there are way more examples like this one, unfortunately not in my case because of the missing assembly reference.. It does not know Win32 in the Microsoft using.
If in any way someone can clear this out to me, I would appreciate it.
I want to save (upload) a file in silverlight into the silverlight application folder.
I get the URI of the application
string str3 = App.Current.Host.Source.AbsoluteUri + "/Recording/";
but i don't know how to save file.
I use this code.....
string extension = "wav";
// Create an instance of the open file dialog box.
OpenFileDialog openFileDialog1 = new OpenFileDialog();
// Set filter options and filter index.
openFileDialog1.Filter = String.Format("{1} files (*.{0})|*.{0}|WAV FILES (*.*)|*.*", extension, "Audio");
openFileDialog1.FilterIndex = 1;
openFileDialog1.Multiselect = false;
// Call the ShowDialog method to show the dialog box.
bool? userClickedOK = openFileDialog1.ShowDialog();
// Process input if the user clicked OK.
if (userClickedOK == true)
{
string str = App.Current.Host.Source.AbsoluteUri + "/Recording/";
openFileDialog1.File.CopyTo(str);
}
That won't work by itself (I assume your application is hosted on a web server), you need an uploader that will send the content to the server, and a server side handler that will receive and store the file.
Take you pick from one of those Silverlight uploaders:
Silverlight File Uploader
Silverlight File Upload
Silverlight Multi File Uploader
Personally I went with the first one, but I believe they're all quite good.
I've parsed these files in regular C# applications, but the IO methods for the files are different in Silverlight, and I can't seem to find the right methods. Searches haven't turned up any information I can use. For the real application I'll be receiving XML from the server, but for the prototype I just need to parse a file with some sample data in it.
You can save the Excel file as XML. An example can be found in this link
This way you can keep your import procedure the same and process the data as when you go live.
To access files from the user's machine you are required to use the OpenFileDialog and SaveFileDialog. Without elevated trust (requires out of browser apps) you will not be able to know anything more than the filename the user selected for input/saving; you will have no idea what the path is to this file. This function can only be called as the result of a user taking an action such as clicking a button; otherwise it will fail because Silverlight does not want malicious code prompting a user with annoying dialogs automatically.
To do this you would do something as follows:
var openFile = new OpenFileDialog();
if ( open.ShowDialog() == true ) // Sadly this is a nullable bool so this is necessary
{
using( Stream myStream = openFile.File.OpenRead() )
using ( var reader = new StreamReader( myStream ))
{
...
}
}
I have a Silverlight app where I want to do an export of some data. The file output format is most likely going to be PDF or Word. But let's assume I can generate the file contents appropriately. I want to be able to pop up a Save dialog for the user to save this data or open it directly in the program.
Now obviously I could just launch the user to a URL and do the export on the server, and change the MIME type of the response to be either Word or PDF. This would work just fine. However, the sticking point is that I already have the correct data on the client (including complex filters and the like) and recreating this data set on the server just to send it back to the client again seems silly if I can avoid it.
Is there any way to take an existing set of data in Silverlight and generate a Word or PDF file and get it onto the user's computer? I could also do it from JavaScript using browser interop from Silverlight. I don't want to use out-of-browser Silverlight.
You need to use the SaveFileDialog class. Note that due to Silverlight's security settings, the SaveFileDialog needs to be opened as the result of a user event (e.g., a button click).
The dialog can be configured (if you want) using properties such as DefaultExt or Filter before you display it using the ShowDialog() method.
The ShowDialog() method will return true if the user correctly specified a file and clicked OK. If this is the case, you can then call the SaveFileDialog.OpenFile() method to access this file and write your data to it.
Example:
private void Button_Click(object sender, EventArgs e)
{
SaveFileDialog saveDialog = new SaveFileDialog();
if (saveDialog.ShowDialog())
{
System.IO.Stream fileStream = textDialog.OpenFile();
System.IO.StreamWriter sw = new System.IO.StreamWriter(fileStream);
sw.Write("TODO: Generate the data you want to put in your file");
sw.Flush();
sw.Close();
}
}