C# Configuration Files
Solution 1
Well, I figured it out myself after debugging for almost 5 hours, Damn!
The problem was when I used OpenFileDialog to get the file path, it changed the current directory to the one which is selected in the dialog, so the program couldn't find the config file. All I did was to set the RestoreDirectory property of OpenFileDialog to true and poof it worked
Thanks everyone, ChrisF, Eoin Campbell and pablito.
Solution 2
Are you accessing the file by its full path or just the file name?
If the latter then this will work when the file is in the same folder as the executable, but not otherwise.
UPDATE
It looks as though things are more complicated than I first thought and this doesn't seem to be the issue here - see the comments. The line that's raising the exception is:
externalConfig.AppSettings.Settings["ServerAddress"].Value = serverAddr;
So that means that there's a null reference somewhere along the chain. If you can identify which it is then that should give you a pointer to the problem.
akif
Updated on June 22, 2020Comments
-
akif almost 4 years
Okay, so a while ahead I posted how to read other config files of other programs (here is the link Previous Post. I managed to do it. But now there is another problem. The scenario is like this, I have two programs. Program A reads its configuration from a config file and program B is only used to modify the contents of the config file which A reads. The name of the config file is email.config. It is in the same directory in which program A & B resides.
The problem is that I get path of a file for attachment using open file dialog. If the path points to a file in the same directory, the program works perfect! But if it points to a file outside the directory it throws an exception of type System.NullReferenceException.
Here is the code
private void saveBtn_Click(object sender, EventArgs e) { try { // save everything and close string attachment = attachTxtBox.Text; var configMap = new ExeConfigurationFileMap { ExeConfigFilename = configFileName }; // it throws exception here when // the path points to a file outside the exes directory Configuration externalConfig = ConfigurationManager.OpenMappedExeConfiguration(configMap, ConfigurationUserLevel.None); externalConfig.AppSettings.Settings["ServerAddress"].Value = serverAddr; externalConfig.AppSettings.Settings["Port"].Value = port; externalConfig.AppSettings.Settings["SSL"].Value = ssl.ToString(); externalConfig.AppSettings.Settings["Sender"].Value = senderAddr; externalConfig.AppSettings.Settings["SenderPassword"].Value = password; externalConfig.AppSettings.Settings["Subject"].Value = subject; externalConfig.AppSettings.Settings["AttachmentPath"].Value = attachment; externalConfig.AppSettings.Settings["Body"].Value = messageBody; // Save values in config externalConfig.Save(ConfigurationSaveMode.Full); Application.Exit(); } catch (System.Exception ex) { MessageBox.Show("Error: " + ex.Message); Application.Exit(); } }
The content of email.config is:
<?xml version="1.0" encoding="utf-8" ?> <configuration> <appSettings file=""> <clear /> <add key="ServerAddress" value="" /> <add key="Port" value="" /> <add key="Sender" value="" /> <add key="SenderPassword" value="" /> <add key="Subject" value="" /> <add key="AttachmentPath" value="" /> <add key="Body" value="" /> </appSettings> </configuration>
What am I doing wrong here?
EDIT: The value of configFileName is "email.config"
-
akif almost 15 yearsWell, I think you interpreted me wrong. What I'm saying that the config file is in the same directory and I'm able to access it. The problem occurs when the file path which I get from the OpenFileDialog is outside the directory of the exe. But, but the file path which I get from the dialog is a full path and I don't use that file path. All I do is just store it in a key. But I cant do that
-
ChrisF almost 15 yearsWithout seeing the value of configMap I can't really think of anything else.
-
akif almost 15 yearsThe value of configFileName is "email.config"
-
ChrisF almost 15 yearsThat's my point. If it's in a different folder it needs to be something along the lines of: "C:\Folder1\Folder2\email.config"
-
akif almost 15 yearsBut the config file is in the same directory. The file which I get from other OpenFileDialog isn't used to open the config file. I just store it inside the config file.
-
ChrisF almost 15 yearsI'm confused now, though I think we're talking about different things here. OK - what's the value stored in the config file?
-
akif almost 15 yearsSorry, yes I know it is confusing. The file path which I get from OpenFileDialog is to be stored in the config file.
-
ChrisF almost 15 yearsLooking back at your code I'm not sure which line is throwing exception. Is it the creation of "configMap" or when it's used?
-
ChrisF almost 15 yearsAnd it's the full path that's stored?
-
ChrisF almost 15 yearsCan you clarify which line is raising the exception?
-
akif almost 15 yearsIt is this line externalConfig.AppSettings.Settings["ServerAddress"].Value = serverAddr;
-
fretje almost 15 yearsyou figured it out ;-) sorry couldn't resist :)