头晕脑涨地研究了一天,就为了实现在函数的参数中返回结构数组。

现供大家分享，节省学习时间。

实例:
  /// <summary>
  /// 用户信息结构
  /// </summary>
  public struct TUSER
  {
   public string LoginName;
   public string LoginPass;
   public string TrueName;
   public string EMail;
   public int Level;
  }

  /// <summary>
  /// 获得所有注册用户
  /// </summary>
  /// <param name="USERINFO">返回用户信息结构</param>
  public bool GetUsers(out TUSER[] G_USERINFO)
   {
   USEROP.TUSER[] f_TUSER;
   int CurRec = 0;  //初始化记录计数器
   int rec_count =0; //计算总记录数
   SqlConnection myConn = new SqlConnection(connectionString);
   string cmd="select * from " +m_Table;  //SQL查询语句
   SqlCommand mycmd=new SqlCommand(cmd,myConn);
   mycmd.Connection.Open(); //打开连接
   SqlDataReader adr = null; //创建数据读取器
   try
   {
    adr = mycmd.ExecuteReader();
    while(adr.Read ())
    {
     rec_count += 1;
    }
    myConn.Close();  //关闭数据库连接
    mycmd.Connection.Open (); //打开数据库连接
    try
    {
     adr = mycmd.ExecuteReader ();
     f_TUSER = new USEROP.TUSER[rec_count];
     while(adr.Read())
     {
      f_TUSER[CurRec].LoginName = adr["US_LOGINNAME"].ToString();
      f_TUSER[CurRec].LoginPass = adr["US_LOGINPASS"].ToString ();
      f_TUSER[CurRec].TrueName = adr["US_TrueName"].ToString ();
      f_TUSER[CurRec].EMail = adr["US_EMail"].ToString ();
      f_TUSER[CurRec].Level = Int32.Parse (adr["US_Level"].ToString ());   
      CurRec += 1;
     }
     G_USERINFO = f_TUSER;
     myConn.Close (); ///关闭连接
     return true;
    }
    catch
    {
     myConn.Close();
     f_TUSER = new USEROP.TUSER[1];
     f_TUSER[0].LoginName = "";
     f_TUSER[0].LoginPass = "";
     f_TUSER[0].TrueName = "";
     f_TUSER[0].EMail = "";
     f_TUSER[0].Level = 0;
     G_USERINFO = f_TUSER;
     return false;
    }
   }
   catch
   {
    myConn.Close ();
    f_TUSER = new USEROP.TUSER[1];
    f_TUSER[0].LoginName = "";
    f_TUSER[0].LoginPass = "";
    f_TUSER[0].TrueName = "";
    f_TUSER[0].EMail = "";
    f_TUSER[0].Level = 0;
    G_USERINFO = f_TUSER;