c# 配置文件App.config操作类库的方法

public class configoperator
  {
    #region 从配置文件获取value
    /// <summary>
    /// 从配置文件获取value
    /// </summary>
    /// <param name="key">配置文件中key字符串</param>
    /// <returns></returns>
    public static string getvaluefromconfig(string key)
    {
      try
      {
        configuration config = configurationmanager.openexeconfiguration(configurationuserlevel.none);
        //获取appsettings的节点 
        appsettingssection appsection = (appsettingssection)config.getsection("appsettings");
        return appsection.settings[key].value;
      }
      catch
      {
        return "";
      }
    }
    #endregion

    #region 设置配置文件
    /// <summary>
    /// 设置配置文件
    /// </summary>
    /// <param name="key">配置文件中key字符串</param>
    /// <param name="value">配置文件中value字符串</param>
    /// <returns></returns>
    public static bool setvaluefromconfig(string key, string value)
    {
      try
      {
        //打开配置文件 
        configuration config = configurationmanager.openexeconfiguration(configurationuserlevel.none);
        //获取appsettings的节点 
        appsettingssection appsection = (appsettingssection)config.getsection("appsettings");
        appsection.settings[key].value = value;
        config.save();

        return true;
      }
      catch
      {
        return false;
      }
    }
    #endregion