Question

我对c＃语言更新。现在我的项目是将数据从数据库提取到datagridview并添加编辑和删除列。

我在表学生中有5个字段（id，姓名，学位，大学，城市）

这里是我的代码：

        MySqlConnection connection = new MySqlConnection("SERVER=hostaddress","DATABASE=DTBS","UID=UID","PASSWORD=PWDS");
        MySqlCommand command = new MySqlCommand("SELECT * from student;", connection);
        connection.Open();
        DataTable dataTable = new DataTable();
        MySqlDataAdapter da = new MySqlDataAdapter(command);
        da.Fill(dataTable);
        dataGridView1.DataSource = dataTable;

现在我需要在datagridview上添加编辑和删除列的帮助。当我点击datagridview上的编辑时，我需要在表单2上获取行数据，我不明白它是什么，我该怎么做。我在谷歌搜索更多。但我没有得到一个明确的解释，它有助于我进行一些编码。

Answer 1

试试这个编码：

public partial class Form2 : Form
{
// for this we can reload after closing the form 2 the datagridview get refresh
        Form1 _owner;
        public Form2()
        {
            InitializeComponent();
        }
        public Form2(Form1 owner)
        {
            InitializeComponent();
            _owner = owner;
            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form2_FormClosing);
        }

        String MyCon = "SERVER=*******;" +
               "DATABASE=dtbas;" +
               "UID=userid;" +
               "PASSWORD=paswrd;" + "Convert Zero Datetime = True";
        public string a
        {
            get { return txtid.Text; }
            set { txtid.Text = value; }
        }
private void Form2_FormClosing(object sender, FormClosingEventArgs e)
        {
            _owner.data();
        }

 private void Form2_Load(object sender, EventArgs e)
        {
MySqlConnection con = new MySqlConnection(MyCon);
            con.Open();
            MySqlCommand Com = new MySqlCommand("Select * from student where id ='" + txtid.Text + "'", con);
            MySqlDataReader dt = Com.ExecuteReader();
            if (dt.Read())
            {
            // i assume (id textBox as txtid),(name textbox as txtname),(degree textbox as txtdegree),(college textbox as txtcollege),(city textbox as txtcity)
                txtid.Text = dt.GetValue(0).ToString();
                txtname.Text = dt.GetValue(1).ToString();
                txtdegree.Text = dt.GetValue(2).ToString();
                txtcollege.Text = dt.GetValue(3).ToString();
                txtcity.Text = dt.GetValue(4).ToString();
           con.Close();
        }

//button in form2 to save it in the database. (button as btnsave)

 private void btnsave_Click(object sender, EventArgs e)
 {

 MySqlConnection con = new MySqlConnection(MyCon);
            con.Open();
            string query = string.Format("Update student set id='" + txtid.Text + "' , name='" + txtname.Text + "' , degree='" + txtdegree.Text + "' , college='" + txtcollege.Text + "' , city='" + txtcity.Text + "'where id='" + txtid.Text + "'");
            MySqlCommand cmd = new MySqlCommand(query, con);
            cmd.ExecuteNonQuery();

}
}
}

表格2：

import csv
lines = ['"hello world." here are some words. "and more"']

list(csv.reader(lines, delimiter=' ', quotechar='"'))

Refrence：http://www.dotnetsharepoint.com/2013/07/how-to-add-edit-and-delete-buttons-in.html

它会帮助你。

c＃中datagridview列中的编辑和删除选项

1 个答案: