How Can I Programmatically Modify a Web.config File's Connection String in ASP.NET?

Programmatically modify the Web.config file using C#

When working with web applications in ASP.NET, you often need to modify the web.config file. While manually editing the file is an option, for flexibility and automation it is recommended to manipulate web.config programmatically.

One way is to use configuration objects. Here is a complete example showing how to change the connection string in the web.config file:

<code class="language-csharp">using System.Configuration;

namespace WebConfigManipulation
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // 加载 web.config 文件
            var configuration = WebConfigurationManager.OpenWebConfiguration("~");

            // 获取连接字符串部分
            var section = (ConnectionStringsSection)configuration.GetSection("connectionStrings");

            // 更新连接字符串
            section.ConnectionStrings["MyConnectionString"].ConnectionString = "Data Source=...";

            // 保存更新后的 web.config 文件
            configuration.Save();
        }
    }
}</code>

In this example, we use WebConfigurationManager.OpenWebConfiguration to load the web.config file and then use GetSection to retrieve the "connectionStrings" section. Now we can modify the connection string as needed and finally use Save to save the updated configuration to disk.

Alternatively, you can use the System.Xml namespace to access the web.config file directly, but using a configuration object is generally considered a better practice.

For more complex scenarios or custom needs, you may need to delve deeper into simulation technology to ensure appropriate access.

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