Question

但是，仍然没有回答这个问题！我需要修改连接字符串而不是添加新字符串。

Answer 1

这会帮助你！

        /// <summary>
        /// Add a connection string to the connection
        /// strings section and store it in the
        /// configuration file. 
        /// </summary>
        /// <param name="csName">The name of the property.</param>
        /// <param name="connectionString">The connectionstring as specified.</param>
        public static void AddConnectionStrings(string csName, string connectionString)
        {

            // Get the configuration file.
            System.Configuration.Configuration config =
                ConfigurationManager.OpenExeConfiguration(
                ConfigurationUserLevel.None);

            // Add the connection string.
            ConnectionStringsSection csSection = config.ConnectionStrings;
            csSection.ConnectionStrings.Add(
                new ConnectionStringSettings(csName,
                    connectionString, "System.Data.SqlClient"));

            // Save the configuration file.
            config.Save(ConfigurationSaveMode.Full);       
        }

好的更新很难找到任何有用的东西用于更新连接字符串的代码。这是不可能的更新一个连接字符串，所以我删除了 connectionstring，并添加一个新的。那不是很奇怪？微软留下了一些东西...好吧也许它没用改变你的app.config，但是，无论如何我必须做到。所以动态的app.config或web.config文件有点奇怪，因为你无法动态更新它。不，你必须先通过配置管理器将其删除。

        /// <summary>
        /// First remove the old connectionstring and after that
        /// add a connection string to the connectionstrings
        /// section and store it in the configuration file. 
        /// </summary>
        /// <param name="csName">The name of the property.</param>
        /// <param name="connectionString">The connectionstring as specified.</param>
        public static void UpdateConnectionStrings(string csName, string connectionString)
        {
            // Get the configuration file
            System.Configuration.Configuration config =
                ConfigurationManager.OpenExeConfiguration(
                ConfigurationUserLevel.None);

            // Remove the existing connectionstring.
            config.ConnectionStrings.ConnectionStrings.Remove(csName);
            // Add the connectionstring
            ConnectionStringsSection csSection = config.ConnectionStrings;
            csSection.ConnectionStrings.Add(
                new ConnectionStringSettings(csName, 
                connectionString, "System.Data.SqlClient"));

            // Save the configuration file
            config.Save(ConfigurationSaveMode.Full);
        }

Answer 2

这是一个古老的问题，我想知道最终为您解决的解决方案。如果你还没有解决，this question会尝试回答它。

在VS2005中更改ConnectionString（C＃）

2 个答案: