asp.net 连接oracle的DBHelper出现的“DBHelper的类型初始值设定项引发异常。”

Question

DBHelper代码：using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using System.Data.OracleClient;namespace CieccProduct.DAL
{
    public class DBHelper
    {
        
        #region Oracle
        public static OracleCommand cmd = null;
        public static OracleConnection conn = null;
        public static string connstr = ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;
        public DBHelper()
        { }
        #region 建立数据库连接对象
        /// <summary>
        /// 建立数据库连接
        /// </summary>
        /// <returns>返回一个数据库的连接OracleConnection对象</returns>
        public static OracleConnection init()
        {
            try
            {
                conn = new OracleConnection(connstr);
                if (conn.State != ConnectionState.Open)
                {
                    conn.Open();
                    System.Web.HttpContext.Current.Response.Write("连接成功！");
                }            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
                System.Web.HttpContext.Current.Response.Redirect("Bug.aspx");
            }
            return conn;
        }
        #endregion
        #region 设置OracleCommand对象
        /// <summary>
        /// 设置OracleCommand对象       
        /// </summary>
        /// <param name="cmd">OracleCommand对象 </param>
        /// <param name="cmdText">命令文本</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdParms">参数集合</param>
        private static void SetCommand(OracleCommand cmd, string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            cmd.CommandType = cmdType;
            if (cmdParms != null)
            {
                cmd.Parameters.AddRange(cmdParms);
            }
        }
        #endregion
        #region 执行相应的sql语句，返回相应的DataSet对象
        /// <summary>
        /// 执行相应的sql语句，返回相应的DataSet对象
        /// </summary>
        /// <param name="sqlstr">sql语句</param>
        /// <returns>返回相应的DataSet对象</returns>
        public static DataSet GetDataSet(string sqlstr)
        {
            DataSet set = new DataSet();
            try
            {
                init();
                OracleDataAdapter adp = new OracleDataAdapter(sqlstr, conn);
                adp.Fill(set);
                conn.Close();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
            }
            return set;
        }
        #endregion
        #region 执行相应的sql语句，返回相应的DataSet对象
        /// <summary>
        /// 执行相应的sql语句，返回相应的DataSet对象
        /// </summary>
        /// <param name="sqlstr">sql语句</param>
        /// <param name="tableName">表名</param>
        /// <returns>返回相应的DataSet对象</returns>
        public static DataSet GetDataSet(string sqlstr, string tableName)
        {
            DataSet set = new DataSet();
            try
            {
                init();
                OracleDataAdapter adp = new OracleDataAdapter(sqlstr, conn);
                adp.Fill(set, tableName);
                conn.Close();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
            }
            return set;
        }
        #endregion
        #region 执行不带参数sql语句，返回所影响的行数
        /// <summary>
        /// 执行不带参数sql语句，返回所影响的行数
        /// </summary>
        /// <param name="cmdstr">增，删，改sql语句</param>
        /// <returns>返回所影响的行数</returns>
        public static int ExecuteNonQuery(string cmdText)
        {
            int count;
            try
            {
                init();
                cmd = new OracleCommand(cmdText, conn);
                count = cmd.ExecuteNonQuery();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return count;
        }
        #endregion
        #region 执行带参数sql语句或存储过程，返回所影响的行数
        /// <summary>
        ///  执行带参数sql语句或存储过程，返回所影响的行数
        /// </summary>
        /// <param name="cmdText">带参数的sql语句和存储过程名</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdParms">参数集合</param>
        /// <returns>返回所影响的行数</returns>
        public static int ExecuteNonQuery(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            int count;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                count = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return count;
        }
        #endregion
        #region 执行不带参数sql语句，返回一个从数据源读取数据的OracleDataReader对象
        /// <summary>
        /// 执行不带参数sql语句，返回一个从数据源读取数据的OracleDataReader对象
        /// </summary>
        /// <param name="cmdstr">相应的sql语句</param>
        /// <returns>返回一个从数据源读取数据的OracleDataReader对象</returns>
        public static OracleDataReader ExecuteReader(string cmdText)
        {
            OracleDataReader reader;
            //try
            //{
                init();
                cmd = new OracleCommand(cmdText, conn);
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            //}
            //catch (Exception ex)
            //{
            //    throw new Exception(ex.Message.ToString());
            //}
            return reader;
        }
        #endregion
        #region 执行带参数的sql语句或存储过程，返回一个从数据源读取数据的OracleDataReader对象
        /// <summary>
        /// 执行带参数的sql语句或存储过程，返回一个从数据源读取数据的OracleDataReader对象
        /// </summary>
        /// <param name="cmdText">sql语句或存储过程名</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdParms">参数集合</param>
        /// <returns>返回一个从数据源读取数据的OracleDataReader对象</returns>
        public static OracleDataReader ExecuteReader(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            OracleDataReader reader;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return reader;
        }
        #endregion
        #region 执行不带参数sql语句,返回结果集首行首列的值object
        /// <summary>
        /// 执行不带参数sql语句,返回结果集首行首列的值object
        /// </summary>
        /// <param name="cmdstr">相应的sql语句</param>
        /// <returns>返回结果集首行首列的值object</returns>
        public static object ExecuteScalar(string cmdText)
        {
            object obj;
            try
            {
                init();
                cmd = new OracleCommand(cmdText, conn);
                obj = cmd.ExecuteScalar();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return obj;
        }
        #endregion
        #region 执行带参数sql语句或存储过程,返回结果集首行首列的值object
        /// <summary>
        /// 执行带参数sql语句或存储过程,返回结果集首行首列的值object
        /// </summary>
        /// <param name="cmdText">sql语句或存储过程名</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdParms">返回结果集首行首列的值object</param>
        /// <returns></returns>
        public static object ExecuteScalar(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            object obj;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                obj = cmd.ExecuteScalar();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return obj;
        }
        #endregion
        #endregion
    }
}
调用：OracleDataReader reader = DBHelper.ExecuteReader(sql);什么原因？  麻烦说的清楚点  谢谢

Answer 1

查看下你的数据库连接字符串是否正确。断点connstr的值。

Answer 2

断点打不进DBHelper   
OracleDataReader reader = DBHelper.ExecuteReader(sql);
在这打断点 F11进不去 直接出异常

Answer 3

呵呵 这个问题自己解决了 有会oracle 11g的吗？ 要设置java.exe怎么回事？

Answer 4

<connectionStrings>
    <!--<add name="ConnString" connectionString="Data Source=.;User ID=sa;Password=sa;Initial Catalog=CieccProduct" providerName="System.Data.SqlClient"/>-->
    <add name="ConneString" connectionString="Data Source=oracle;User ID=test; Password=test; Unicode=True" providerName="System.Data.OracleClient"/>
  </connectionStrings>这样接连oracle可以吗？