Write values in app config file

Question

can anyone please help me how can I set store values in the app config file using c   is it possible at all

User · Answer

I struggled with this for a while and finally figured it out on my own. I didn't find any help at the time, but wanted to share my approach. I have done this several times and used a different method than what is above. Not sure how robust it is, but it has worked for me.

Let's say you have a textbox named "txtName", a button named "btnSave" and you want to save the name so the next time you run your program the name you typed appears in that textbox.

Go to Project>Properties>Settings and create a setting -

name = "Name"
type = "string"
scope = "user"
value you can leave blank.

Save your settings file.

Go to your form where textbox and button exist. Double click your button and put this code in;

    //This tells your program to save the value you have to the properties file (app.config);
    //"Name" here is the name you used in your settings file above.
    Properties.Settings.Default.Name = txtName.txt;
    //This tells your program to make these settings permanent, otherwise they are only
    //saved for the current session
    Properties.Settings.Default.Save();

Go to your form_load function and add this in there;

    //This tells your program to load the setting you saved above to the textbox
    txtName.txt = Properties.Settings.Default.Name;

Debug your application and you should see the name you typed in.
Check your application debug directory and you should see a .config file named after your program. Open that with a text editor and you will see your settings.

Notes -

"Name" refers to the actual name of the setting you created.
Your program will take care of creating the actual XML file, you don't have to worry about it.

User · Answer

private static string GetSetting string key        return ConfigurationManager AppSettings key      private static void SetSetting string key  string value        Configuration configuration   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None       configuration AppSettings Settings key  Value   value      configuration Save ConfigurationSaveMode Full  true       ConfigurationManager RefreshSection  appSettings

User · Answer

For a  NET 4 0 console application  none of these worked for me  So I used the following below and it worked   private static void UpdateSetting string key  string value        Configuration configuration   ConfigurationManager          OpenExeConfiguration Assembly GetExecutingAssembly   Location       configuration AppSettings Settings key  Value   value      configuration Save         ConfigurationManager RefreshSection  appSettings

User · Answer

On Framework 4 5 the AppSettings Settings  key   part of ConfigurationManager is read only so I had to first Remove the key then Add it again using the following   Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath    config AppSettings Settings Remove  MySetting    config AppSettings Settings Add  MySetting    some value     config Save ConfigurationSaveMode Modified     Don t worry  you won t get an exception if you try to Remove a key that doesn t exist   This post gives some good advice

User · Answer

Try the following code       Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath       config AppSettings Settings Add  YourKey    YourValue        config Save ConfigurationSaveMode Minimal     It worked for me  -

User · Answer

Try the following    Configuration config   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None               config AppSettings Settings key  Value   value  config Save    ConfigurationManager RefreshSection  appSettings

User · Answer

If you are using App Config to store values in  lt add Key    Value      gt   or CustomSections section use ConfigurationManager class  else use XMLDocument class   For example    lt  xml version  1 0  encoding  utf-8    gt   lt configuration gt     lt appSettings gt       lt add key  server  value  192 168 0 1 xxx   gt       lt add key  database  value  DataXXX   gt       lt add key  username  value  userX   gt       lt add key  password  value  passX   gt     lt  appSettings gt   lt  configuration gt    You could use the code posted on CodeProject

User · Answer

if you want change Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath   config AppSettings Settings key  Value   value     if you want add Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath   config AppSettings Settings Add  key   value

User · Answer

string filePath   System IO Path GetFullPath  settings app config     var map   new ExeConfigurationFileMap   ExeConfigFilename   filePath    try          Open App Config of executable     Configuration config   ConfigurationManager OpenMappedExeConfiguration map  ConfigurationUserLevel None           Add an Application Setting if not exist          config AppSettings Settings Add  key1    value1            config AppSettings Settings Add  key2    value2            Save the changes in App config file      config Save ConfigurationSaveMode Modified           Force a reload of a changed section      ConfigurationManager RefreshSection  appSettings      catch  ConfigurationErrorsException ex        if  ex BareMessage     Root element is missing                  File Delete filePath           return            MessageBox Show ex Message

User · Answer

Yes you can - see ConfigurationManager     The ConfigurationManager class   includes members that enable you to   perform the following tasks          Read and write configuration files as a whole       Learn to use the docs  they should be your first port-of call for a question like this

User · Answer

As others mentioned  you can do this with ConfigurationManager AppSettings Settings  But  Using Settings key    value will not work if the key doesn t exist  Using Settings Add key  value   if the key already exists  it will join the new value to its value s  separated by a comma  something like  lt add key  myKey  value  value1  value2  value3    gt   To avoid these unexpected results  you have to handle two scenario s   If entry with the given key exists  then update its value if entry with the given key doesn t exist  then create new entry key value    Code    public static void Set string key  string value        var config   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None        var entry   config AppSettings Settings key       if  entry    null          config AppSettings Settings Add key  value       else         config AppSettings Settings key  Value   value       config Save ConfigurationSaveMode Modified       For more info about the check entry    null  check this post  Hope this will help someone

[c#] Write values in app.config file

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