C# 将int数据类型转换为字符串数据类型c access数据库

我从我的项目中创建了Windows应用程序，现在我面临一个问题。 问题是：我已经有一个文本框数组，并且想要连接那些数据库文本框，但是，我无法获取数据，因为我想要连接的数据是int数据类型

我已经创建了两个表单，一个用于登录表单，对于登录表单，数据库是字符串，因此自动完成正在工作。第二个是第二个表单，对于第二个表单，数据库是int，因此自动完成不起作用

我的问题是：如何将int数据类型转换为string数据类型

这是我第二张表格的代码：

string connectionString = (@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\Archives\Projects\Program\Sell System\Sell System\App_Data\db1.accdb;Persist Security Info=False;");

    private List<List<TextBox>> textBoxCodeContainer = new List<List<TextBox>>();

    OleDbDataReader dReader;
    OleDbConnection conn = new OleDbConnection(connectionString);
    conn.Open();
    OleDbCommand cmd = new OleDbCommand("SELECT DISTINCT [Code] FROM [Data] ORDER BY [Code] ASC", conn);
    dReader = cmd.ExecuteReader();
    AutoCompleteStringCollection codesCollection = new AutoCompleteStringCollection();

    while (dReader.Read())
    {
    codesCollection.Add(Convert.ToString(dReader.GetInt32(dReader.GetOrdinal("Code")))); // This line is not working
    }

//****TextBox for Code****
            for (int y = 0; y <= 16; y++)
            {
                textBoxCodeContainer.Add(new List<TextBox>());
                textBoxCodeContainer[0].Add(new TextBox());
                textBoxCodeContainer[0][y].Size = new Size(100, 50);
                textBoxCodeContainer[0][y].Location = new Point(25, 150 + (y * 25));

                textBoxCodeContainer[0][y].AutoCompleteMode = AutoCompleteMode.Suggest;
                textBoxCodeContainer[0][y].AutoCompleteSource = AutoCompleteSource.CustomSource;
                textBoxCodeContainer[0][y].AutoCompleteCustomSource = codesCollection;

                dReader.Close();
                conn.Close();

                Controls.Add(textBoxCodeContainer[0][y]);
            }

编辑：代码的数据类型为数字，字段大小为长整数，格式为0000。。后面的零替换为数字1、2等

编辑： *完整代码****

我的问题是：如何将int数据类型转换为string数据类型

使用

所以

以字符串形式获取指定列的值

---

如果要在所有代码中使用代码作为字符串，为什么不从查询中更改它

由[Code]ASC从[Data]订单中选择不同的CStr[Code]

---

ACCESS支持一些VBscript，因此CStr可以实现这一点。如果这样做，DBReader会将代码视为字符串

我简直不敢相信，在这里发布问题之前，你会花一秒钟的时间搜索这个问题……你说“codesCollection.AddConvert.ToStringReader.GetInt32dReader.GetOrdinalCode；”它不起作用。假设代码字段是整数，而不是null@Steve：我的意思是，不工作是int数据类型的autocomplete不工作，跟踪时的代码给了我autos，所以这意味着没有错误，对吗？AutoCompleteStringCollection需要字符串而不是int。所以我还是不明白你的问题在哪里。如果您开始在文本框中键入数字，则自动完成功能是否有效？否，当我在文本框中键入数字时，自动完成功能不起作用，但当我将代码更改为：OleDbCommand cmd=new OleDbCommand从[Member]ORDER BY[Username]ASC，conn；我已经尝试过该代码，但它不起作用，我的值在数据库中，所以我如何填写yourIntValue为什么不填写yourIntValue.ToString？codesCollection.AddConvert.ToString.GetOrdinalCode@EhsanUllah：不，在我在这个论坛上发布之前，我已经试过了你给我的代码，但它不起作用either@FuhansPujiSaputradReader.GetOrdinalCode返回什么？它给了我几个错误，它们是：无法将字符串类型转换为int类型，并且dbdatareader.getstringint的最佳重载方法有一些无效参数

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.Security.Principal;
using System.Data.OleDb;

namespace Sell_System
{
    public partial class Form2 : Form
    {
        string connectionString = (@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\Archives\Projects\Program\Sell System\Sell System\App_Data\db1.accdb;Persist Security Info=False;");
        private Form1 firstForm;
        private List<List<TextBox>> textBoxCodeContainer = new List<List<TextBox>>();
        private List<List<TextBox>> textBoxQuantityContainer = new List<List<TextBox>>();
        private List<List<TextBox>> textBoxDescContainer = new List<List<TextBox>>();
        private List<List<TextBox>> textBoxSubTotalContainer = new List<List<TextBox>>();
        private List<List<TextBox>> textBoxTotalContainer = new List<List<TextBox>>();

        public Form2()
        {
            InitializeComponent();
        }

        public Form2(Form1 firstForm)
            : this()
        {
            this.firstForm = firstForm;
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            //var int num = 10;

            OleDbDataReader dReader;
            OleDbConnection conn = new OleDbConnection(connectionString);
            conn.Open();
            OleDbCommand cmd = new OleDbCommand("SELECT DISTINCT [Code] FROM [Data] ORDER BY [Code] ASC", conn);
            dReader = cmd.ExecuteReader();
            AutoCompleteStringCollection codesCollection = new AutoCompleteStringCollection();

            while (dReader.Read())
            {
                codesCollection.Add(Convert.ToString(dReader.GetInt32(dReader.GetOrdinal("Code"))));
                //codesCollection.Add(Convert.ToString(num);
            }

            if (firstForm.comboBox1.SelectedIndex == 0)
            {
                label1.Text = "Code:";
                label1.Location = new Point(60, 125);
                label2.Text = "Welcome to the Selling System.";
                label2.Location = new Point(600, 0);
                label3.Text = "Quantity:";
                label3.Location = new Point(155, 125);
                label4.Text = "Description:";
                label4.Location = new Point(580, 125);
                label5.Text = "Sub Total on Rp:";
                label5.Location = new Point(1020, 125);
                label6.Text = "Total on Rp:";
                label6.Location = new Point(1210, 125);
                label7.Text = "Total on Rp:";
                label7.Location = new Point(1080, 580);
            }

            else if (firstForm.comboBox1.SelectedIndex == 1)
            {
                label1.Text = "Kode:";
                label1.Location = new Point(60, 125);
                label2.Text = "Selamat datang di Selling System.";
                label2.Location = new Point(600, 0);
                label3.Text = "Banyaknya:";
                label3.Location = new Point(145, 125);
                label4.Text = "Keterangan:";
                label4.Location = new Point(580, 125);
                label5.Text = "Sub Total di Rp:";
                label5.Location = new Point(1020, 125);
                label6.Text = "Total di Rp:";
                label6.Location = new Point(1210, 125);
                label7.Text = "Total di Rp:";
                label7.Location = new Point(1080, 580);
            }

            //****TextBox for Code****
            for (int y = 0; y <= 16; y++)
            {
                textBoxCodeContainer.Add(new List<TextBox>());
                textBoxCodeContainer[0].Add(new TextBox());
                textBoxCodeContainer[0][y].Size = new Size(100, 50);
                textBoxCodeContainer[0][y].Location = new Point(25, 150 + (y * 25));

                textBoxCodeContainer[0][y].AutoCompleteMode = AutoCompleteMode.Suggest;
                textBoxCodeContainer[0][y].AutoCompleteSource = AutoCompleteSource.CustomSource;
                textBoxCodeContainer[0][y].AutoCompleteCustomSource = codesCollection;

                dReader.Close();
                conn.Close();

                Controls.Add(textBoxCodeContainer[0][y]);
            }

            //****TextBox for Quantity****
            for (int y = 0; y <= 16; y++)
            {
                textBoxQuantityContainer.Add(new List<TextBox>());
                textBoxQuantityContainer[0].Add(new TextBox());
                textBoxQuantityContainer[0][y].Size = new Size(100, 50);
                textBoxQuantityContainer[0][y].Location = new Point(125, 150 + (y * 25));

                Controls.Add(textBoxQuantityContainer[0][y]);
            }

            //****TextBox for Description****
            for (int y = 0; y <= 16; y++)
            {
                textBoxDescContainer.Add(new List<TextBox>());
                textBoxDescContainer[0].Add(new TextBox());
                textBoxDescContainer[0][y].Size = new Size(750, 50);
                textBoxDescContainer[0][y].Location = new Point(225, 150 + (y * 25));

                Controls.Add(textBoxDescContainer[0][y]);
            }

            //****TextBox for Sub Total****
            for (int y = 0; y <= 16; y++)
            {
                textBoxSubTotalContainer.Add(new List<TextBox>());
                textBoxSubTotalContainer[0].Add(new TextBox());
                textBoxSubTotalContainer[0][y].Size = new Size(175, 50);
                textBoxSubTotalContainer[0][y].Location = new Point(975, 150 + (y * 25));

                Controls.Add(textBoxSubTotalContainer[0][y]);
            }

            //****TextBox for Total****
            for (int y = 0; y <= 16; y++)
            {
                textBoxTotalContainer.Add(new List<TextBox>());
                textBoxTotalContainer[0].Add(new TextBox());
                textBoxTotalContainer[0][y].Size = new Size(175, 50);
                textBoxTotalContainer[0][y].Location = new Point(1150, 150 + (y * 25));

                Controls.Add(textBoxTotalContainer[0][y]);
            }

            //****TextBox for Total All****
            TextBox textBoxAllTotal = new TextBox();
            textBoxAllTotal.Size = new Size(175, 50);
            textBoxAllTotal.Location = new Point(1150, 575);

            Controls.Add(textBoxAllTotal);
        }
    }
}

string s = Convert.ToString(yourIntvalue);

 dReader.GetString("Code");

while (dReader.Read())
{
    codesCollection.Add(dReader.GetString("Code"));
}