c# - 如何从 MVC4 中的 web.config 获取字符串值

Question

我想获取一个 logFilePath 值，该值是我通过硬编码提供给 appSettings 的。我试图通过以下方式达到关键值

System.Configuration.Configuration rootWebConfig1 = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(null);
System.Configuration.KeyValueConfigurationElement customSetting = rootWebConfig1.AppSettings.Settings["azureLogUrl"];
string pathValue =  customSetting.Value;

但我收到了空引用异常。如何从 web.config 文件中获取值？

Answer 1

用途:

string pathValue = ConfigurationManager.AppSettings["azureLogUrl"];

您不需要将其转换为字符串并检查空值，因为文档指出:

Values read from the appSettings element of the Web.config file are always of type String. If the specified key does not exist in the Web.config file, no error occurs. Instead, an empty string is returned.