不能使用填充命令

Question

这是我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;
//db con
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Configuration;

namespace SOMaintenance.App_Code {
    public class readdata {
        string sConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        public void selectdata(DataSet dataset1, string sqlcommand) {
            string strConString = ConfigurationManager.ConnectionStrings["SOConnectionString"].ConnectionString;
            OleDbConnection conn = new OleDbConnection(strConString);
            OleDbCommand cmd = new OleDbCommand("SELECT * FROM USERMASTER", conn);
            cmd.Fill(dataset1);
            conn.Open();
            OleDbDataReader dr;
        }
    }
}

我想知道为什么cmd.Fill(dataset1);不能用。它告诉我添加 system.data.oledb.command 但是当我添加时问题仍然存在。有人可以帮忙吗？

Answer 1

试试这个：

DataTable dataTable = new DataTable("USERMASTER");  
using (var conn = new OleDbConnection(sConnectionString))
{
    conn.Open();
    var queryString = "SELECT * FROM USERMASTER";
    using (var comm = new OleDbCommand(queryString, conn))
    {
        using (OleDbDataAdapter da = new OleDbDataAdapter (comm))
        {
            da.Fill(dataTable);
            return dataTable;
        }
    }
    conn.Close();
}

不能使用填充命令

fill command cannot be used

c#

dataset

oledb

fill