To open Web.config from within a web setup project:
string path = Context.Parameters["assemblypath"]; path = path.Substring(0, path.LastIndexOf( Path.DirectorySeparatorChar)); path = Path.Combine(path, "Web.config"); var config = ConfigurationManager.OpenExeConfiguration(path)
To open App.config from within a setup project:
var map = new ExeConfigurationFileMap(); map.ExeConfigFilename = Context.Parameters["assemblypath"] + ".config"; var config = ConfigurationManager.OpenMappedExeConfiguration( map, ConfigurationUserLevel.None);
To update settings in .config files
// update connection strings var cs = config.ConnectionStrings; cs.ConnectionStrings["cs1"].ConnectionString = BuildConnectionString(host, user, pass); // update app settings var appSettings = config.AppSettings; appSettings.Settings["key"].Value = "new value";
Finally, to save the .config file changes
config.Save();
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