Question

我在标题中收到了这个错误。

对于我的

cmd.Connection = Conn;

我有这个

 public string Conn = connection.getConnection();

我正在使用Windows应用程序，我该如何解决这个问题？

这是我的完整代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;



namespace WindowsFormsApplication3
{
    public partial class Room : Form
    {
        public SqlDataReader re;
        public string Conn = connection.getConnection();

        public Room()
        {
            InitializeComponent();
        }

        private void Room_Load(object sender, EventArgs e)
        {
          ..
          ..
          ..
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {

            try
            {
                if (textBox1.Text.Length != 0 && textBox2.Text.Length != 0)
                {

                    SqlCommand cmd = new SqlCommand();
                    cmd.Connection = Conn;
                    cmd.CommandType = System.Data.CommandType.StoredProcedure;
                    cmd.CommandText = "insertToRoom";
                    cmd.Parameters.AddWithValue("@room_name", textBox1);
                    cmd.Parameters.AddWithValue("@room_rate", textBox2);
                    cmd.ExecuteNonQuery();

                }
                else
                {
                    MessageBox.Show("Please fill in all the textbox.", "Wrong Input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }

            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
}
}

Answer 1

试试这种方式。首先从web.conf或app.conf获取连接字符串，然后创建一个sqlconnection以分配给sqlcommand。

 var connectionString =  
     ConfigurationManager.ConnectionStrings["NameofConstringFromWebconfig"].ConnectionString;
 SqlCommand cmd = new SqlCommand();
 cmd.Connection =new SqlConnection(connectionString);

连接字符串。无法隐式转换＆＃39; String＆＃39; to＆＃39; System.Data.SqlClient.SqlConnection＆＃39;

1 个答案: