C#解析指定dll的app.config配置文件

string configFile = System.IO.Path.Combin(AppDomain.CurrentDomain.BaseDirectory, System.Reflection.Assembly.GetExecutingAssembly().GetName().Name+".dll.config");
ConfigHelper configHelper = new ConfigHelper(configFile);
string ServiceName = configHelper.GetAppSettingsValue("ServiceName");
string DisplayName = configHelper.GetAppSettingsValue("DisplayName");
string Description = configHelper.GetAppSettingsValue("Description");

public class ConfigHelper
{
    string _configfile;
    private string ConfigFile
    {
        get
        {
            if (String.IsNullOrEmpty(_configfile))
            {
                string assemblyFile = System.Reflection.Assembly.GetExecutingAssembly().CodeBase;
                _configfile = assemblyFile + ".config";
            }
            return _configfile;
        }
    }

    public ConfigHelper(string configFile)
    {
        _configfile = configFile;
    }

    /// <summary>  
    /// 获取配置文件的属性  
    /// </summary>  
    /// <param name="key"></param>  
    /// <returns></returns>  
    public string GetAppSettingsValue(string key)
    {
        string value = string.Empty;

        try
        {
            //if (File.Exists(ConfigFile))
            {
                XmlDocument xml = new XmlDocument();

                xml.Load(ConfigFile);

                XmlNode xNode = xml.SelectSingleNode("//appSettings");

                XmlElement element = (XmlElement)xNode.SelectSingleNode("//add[@key='" + key + "']");

                value = element.GetAttribute("value").ToString();
            }
        }
        catch { }

        return value;
    }


    /// <summary>  
    /// 获取配置文件的属性  
    /// </summary>  
    /// <param name="key"></param>  
    /// <returns></returns>  
    public string GetConnectionStringValue(string key)
    {
        string value = string.Empty;

        try
        {
            //if (File.Exists(ConfigFile))
            {
                XmlDocument xml = new XmlDocument();

                xml.Load(ConfigFile);

                XmlNode xNode = xml.SelectSingleNode("//connectionStrings");

                XmlElement element = (XmlElement)xNode.SelectSingleNode("//add[@name='" + key + "']");

                value = element.GetAttribute("connectionString").ToString();
            }
        }
        catch { }

        return value;
    }
}