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请帮忙看看这个错误是怎么回事 RRS feed

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  • Question
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    麻烦大家帮忙看看怎么老是显示这句错误： OleDbCommand cmd = new OleDbCommand(sqlstr, conn);提示信息是：无法从OleDbConnection 转换为system.data.oledb.oledb OleDbConnection

    using System;
    using System.Collections.Generic;
    using System.Data.OleDb;
    using System.Drawing;
    using System.Linq;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;

    ……

    ……

    conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" +MapPath("App_Data /assumpsit.accdb)+"'");
                        conn.Open();
                        if (user_id == "" || user_password == "")
                        { Response.Redirect("login.aspx?mess=密码或工号必须填写"); }

                        try //检查是否合法用户
                        {

                            string sqlstr = "select * from teacher where 工号='" + user_id + "' and 密码='" + user_password + "'";
                            OleDbCommand cmd = new OleDbCommand(sqlstr, conn);
                            rs = cmd.ExecuteReader();

    2013年12月21日 12:30

答案

  • Question
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    你好,楼主

    看你代码应该没有什么问题,我照着你的程序写了个demo,跑起来ok. 楼主你试下我的代码呢:

    internal void Execute()
        {

            OleDbConnection objOleDbCon = null;
            OleDbCommand objOleDbCmd = new OleDbCommand();
            OleDbDataAdapter objOleDbDataAdapter = new OleDbDataAdapter();

            string xConnStr = "";
            //xConnStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";
            xConnStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\v-minbao\\Desktop\\SQL\\S20132011.accdb";


            objOleDbCon = new OleDbConnection(xConnStr);
            objOleDbCon.Open();
            try
            {
                objOleDbCmd = new OleDbCommand("SELECT * FROM tblBestemming2WNP", objOleDbCon);
                objOleDbDataAdapter = new OleDbDataAdapter(objOleDbCmd);
                DataTable dt = new DataTable();
                objOleDbDataAdapter.Fill(dt);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally { objOleDbCon.Close(); }
        }
    文件换成你的文件,查询语句也换成你的就可以了.

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    2013年12月23日 3:36
    版主