I took a look at the AppDomain instead of the assembly. This has the benefit of working inside static methods of a library. Link seems to work great for getting the key value as suggested by the other answers here.
public class DLLConfig
{
public static string GetSettingByKey(AppDomain currentDomain, string configName, string key)
{
string value = string.Empty;
try
{
string exeConfigPath = (currentDomain.RelativeSearchPath ?? currentDomain.BaseDirectory) + "\\" + configName;
if (File.Exists(exeConfigPath))
{
using (Stream stream = File.OpenRead(exeConfigPath))
{
XDocument xdoc = XDocument.Load(stream);
XElement element = xdoc.Element("configuration").Element("appSettings").Elements().First(a => a.Attribute("key").Value == key);
value = element.Attribute("value").Value;
}
}
}
catch (Exception ex)
{
}
return value;
}
}
Use it within your library class like so;
namespace ProjectName
{
public class ClassName
{
public static string SomeStaticMethod()
{
string value = DLLConfig.GetSettingByKey(AppDomain.CurrentDomain,"ProjectName.dll.config", "keyname");
}
}
}