C# Winform DataGridView中一行数据的添加，删除，修改

DataGridView的添加一行数据

public partial class add : Form
    {
        private string server = "127.0.0.1";
        private string user = "sa";
        private string pwd = "123456";
        private string connstr = "";
        private string sql = "";
        public add()
        {
            InitializeComponent();
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            connstr = "server="+ server +";uid="+ user +";pwd="+ pwd +";database=ado";
            SqlConnection conn = new SqlConnection(connstr);
            conn.Open();
            sql = "insert into 员工管理表(name,sex,age,job) values(@name,@sex,@age,@job)";
            SqlCommand comm = new SqlCommand(sql,conn);
            comm.Parameters.AddWithValue("@name",txtName.Text);
            comm.Parameters.AddWithValue("@sex",txtSex.Text);
            comm.Parameters.AddWithValue("@age", txtAge.Text);
            comm.Parameters.AddWithValue("@job", txtJob.Text);
            if (comm.ExecuteNonQuery() > 0)
            {
                MessageBox.Show("添加员工成功！");
                
            }
            else
            {
                MessageBox.Show("error");
            }
            conn.Close();
        }
    }

删除DataGridView的当前选中行

private void btnDelete_Click(object sender, EventArgs e)
        {
            //删除选中行
            if (this.dataGridView1.SelectedRows.Count > 0)
            {
                int id = Convert.ToInt32(dataGridView1.CurrentRow.Cells["id"].Value.ToString());                
                connstr = "server=" + server + ";uid=" + user + ";pwd=" + pwd + ";database=ado";
                SqlConnection conn = new SqlConnection(connstr);
                conn.Open();
                sql = "delete from 员工管理表 where id=@id";
                SqlCommand comm = new SqlCommand(sql, conn);
                comm.Parameters.Add(new SqlParameter("@id", id));
                if (comm.ExecuteNonQuery() > 0)
                {
                    MessageBox.Show("ok");
                }
                conn.Close();
                conn.Dispose();
            }
            else
                MessageBox.Show("请先选中再操作");
            
        }

修改当前选中行的数据

1. 在form1当前选中的行的id传过去
2. 用form1传过来的值去数据库中查找并显示在TextBox中
3. 修改TextBox中的值并保存

form1中的代码如下：

 private void btnUpset_Click(object sender, EventArgs e)
        {
    
            if (this.dataGridView1.SelectedRows.Count > 0)
            {
                int index = Convert.ToInt32(dataGridView1.CurrentRow.Cells["id"].Value.ToString());
                change change = new change(index.ToString());
                change.ShowDialog();
            }
            else
                MessageBox.Show("请先选中再操作");

        }

form2中的代码如下：

    public partial class change : Form
    {
        private string server = "127.0.0.1";
        private string user = "sa";
        private string pwd = "123456";
        private string connstr = "";
        private string sql = "";
        public change(string index)//在这里接收index
        {
            InitializeComponent();
            var id = index;         
            connstr = "server=" + server + ";uid=" + user + ";pwd=" + pwd + ";database=ado";
            SqlConnection conn = new SqlConnection(connstr);
            conn.Open();
            sql = "select * from 员工管理表 where id ="+ id +"";
            SqlCommand comm = new SqlCommand(sql, conn);
            用dataset
            SqlDataAdapter ada = new SqlDataAdapter(comm);
            DataSet ds = new DataSet();
            ada.Fill(ds, "员工管理表");

            this.txtId.Text = ds.Tables["员工管理表"].Rows[0]["id"].ToString();
            this.txtName.Text = ds.Tables["员工管理表"].Rows[0]["name"].ToString();
            this.txtSex.Text = ds.Tables["员工管理表"].Rows[0]["sex"].ToString();
            this.txtAge.Text = ds.Tables["员工管理表"].Rows[0]["age"].ToString();
            this.txtJob.Text = ds.Tables["员工管理表"].Rows[0]["job"].ToString();
            //用reader
            //SqlDataReader reader = comm.ExecuteReader();
            //if (reader.Read())
            //{
            //    txtName.Text = reader["name"].ToString();
            //    txtSex.Text = reader["sex"].ToString();
            //    txtAge.Text = reader["age"].ToString();
            //    txtJob.Text = reader["job"].ToString();
            //    txtId.Text = reader["id"].ToString();
            //    reader.Close();
            //}
            conn.Close();
            conn.Dispose();
        }

        private void btnChange_Click(object sender, EventArgs e)
        {
            
            connstr = "server=" + server + ";uid=" + user + ";pwd=" + pwd + ";database=ado";
            SqlConnection conn = new SqlConnection(connstr);
            conn.Open();
            sql = "update 员工管理表 set name=@name,sex=@sex,age=@age,job=@job where id="+ txtId.Text +"";
            SqlCommand comm = new SqlCommand(sql,conn);
            comm.Parameters.AddWithValue("@name", txtName.Text);
            comm.Parameters.AddWithValue("@sex", txtSex.Text);
            comm.Parameters.AddWithValue("@age", txtAge.Text);
            comm.Parameters.AddWithValue("@job", txtJob.Text);
            if(comm.ExecuteNonQuery() > 0)
            {
                MessageBox.Show("修改成功！");
            }
            conn.Close();
            conn.Dispose();
        }

       
    }