How to Programmatically Modify a Web.config File Using C#?

Use C# programming to operate the Web.config file

Question:

How to modify and operate the web.config file using C# programming? Can I use the configuration object to load and edit web.config? Please provide an example showing how to change the connection string in web.config.

Answer:

Yes, you can use the configuration object to load the web.config file and make changes programmatically. The following example demonstrates this process:

var configuration = WebConfigurationManager.OpenWebConfiguration("~");
var section = (ConnectionStringsSection)configuration.GetSection("connectionStrings");
section.ConnectionStrings["MyConnectionString"].ConnectionString = "Data Source=...";
configuration.Save();

This code snippet retrieves the web.config file, gets the "connectionStrings" section as a ConfigurationSection object, and then sets the connection string for the "MyConnectionString" key to a new value. Finally, it saves the modified configuration back to disk.

For more information on simulations and more complex examples, see the following articles:

Programmatically manipulate web.config

Note: The Microsoft document link provided is different from the original link, pointing to the security authorization document of ASP.NET Core, which is slightly related to the topic of modifying web.config, but is not directly relevant guidance. A more appropriate link would be to the Microsoft documentation on the WebConfigurationManager class. I can't provide a precise replacement link because the URL to the Microsoft documentation may change over time. Readers are recommended to search for "WebConfigurationManager C#" to find relevant official Microsoft documentation.

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