How to Best Access Configuration Settings in C# Class Libraries?

Read settings from configuration file in C# class library

When developing C# class libraries, retrieving settings from configuration files (such as web.config or app.config) is critical to maintaining flexibility and adaptability. However, the appropriate methods for achieving this have changed over time.

Deprecated and unavailable options

Using ConfigurationSettings.AppSettings.Get("MySetting") is no longer recommended due to deprecation. On the other hand, ConfigurationManager.AppSettings["MySetting"] doesn't seem to be available in the C# library.

Recommended method

For C# class libraries, the recommended approach is to directly utilize the System.Configuration.ConfigurationManager class, which provides access to configuration settings from various sources, including app.config and web.config files.

Achievement

To use ConfigurationManager, first add a reference to System.Configuration in your project. Once done, access your settings as follows:

<code>// app.config文件示例：

<?xml version="1.0" encoding="utf-8" ?><configuration><appSettings><add key="countoffiles" value="7"></add><add key="logfilelocation" value="abc.txt"></add></appSettings></configuration></code>

With the sample configuration file, you can access the settings using:

string configValue1 = ConfigurationManager.AppSettings["countoffiles"];
string configValue2 = ConfigurationManager.AppSettings["logfilelocation"];

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