C# 将Access数据库中的数据读取到列表框中

有人能告诉我如何修复这个错误吗

 SqlCommand cmd = new SqlCommand(sqlCmd, conn)
 --> conn: Aurgument type 'System.Data.OleDb.OleDbConnection' is not assignable to parameter type 'System.Data.SqlClient.SqlConnection'.

  private void Form1_Load(object sender, EventArgs e)
    {
        string connString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=C:\\Users\\KevinDW\\Desktop\\dotNET\\Week 5\\Prak1\\demo1.accdb";

        OleDbConnection conn = new OleDbConnection(connString);

        conn.Open();

        string sqlCmd = "SELECT CursusNaam FROM tblCursus";

        SqlCommand cmd = new SqlCommand(sqlCmd, conn);

        using (SqlDataReader reader = cmd.ExecuteReader())
        {
            listBox1.Items.Add(reader);
        }

        conn.Close();
    }
}

---

你把Sql和OleDb混在一起了

使用

OleDbCommand

而不是

SqlCommand

并使用

OleDBDataReader

而不是

SqlDataReader

例如：

  private void Form1_Load(object sender, EventArgs e)
    {
        string connString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=C:\\Users\\KevinDW\\Desktop\\dotNET\\Week 5\\Prak1\\demo1.accdb";

        OleDbConnection conn = new OleDbConnection(connString);

        conn.Open();

        string sqlCmd = "SELECT CursusNaam FROM tblCursus";

        OleDbCommand cmd = new OleDbCommand(sqlCmd, conn);

        using (OleDBDataReader reader = cmd.ExecuteReader())
        {
            listBox1.Items.Add(reader);
        }

        conn.Close();
    }
}

---

您使用的是SqlCommand/etc，它需要使用SqlConnection对象而不是OleDbConnection

您要连接的是SQL数据库吗？如果是这样，请改用

SqlConnection

---

编辑：显然不是，读取连接字符串…：D

使用OleDbCommand class.OleCommand和OLEDATReader更改SqlCommand以使用OleDbConnection