How Can I Programmatically Modify a Web.config File's Connection String Using C#?

Use C# (.NET) programming to modify the Web.config file

This article explores ways to modify the web.config file from within C# code, specifically using configuration objects to modify connection strings.

To do this, you can use the WebConfigurationManager class in conjunction with a configuration section. Here's an example:

using System.Configuration;

// 将web.config加载到配置对象中
var configuration = WebConfigurationManager.OpenWebConfiguration("~");

// 访问连接字符串节
var section = (ConnectionStringsSection)configuration.GetSection("connectionStrings");

// 更改连接字符串值
section.ConnectionStrings["MyConnectionString"].ConnectionString = "Data Source=...";

// 保存修改后的配置
configuration.Save();

This code snippet demonstrates how to programmatically modify the connection string in the web.config file, replacing the original value with the new data source.

For more examples and insights, see the article mentioned in the answer. It details other scenarios, including the need for impersonated authentication.

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