Basic use of DataGridView 0526

Introduce data network view

rehearse Go to dgv Logic for binding data in

        private void Form1_Load(object sender, EventArgs e)
        {
    
            //  Get a warehouse with data 

            ///  Definition sql sentence 
            String sql = "select * from sanguo";

            ///  Get the connection object 
            String connStr = "Data Source=.;Initial Catalog=mySchool;Integrated Security=True";
            SqlConnection conn = new SqlConnection(connStr);

            ///  Get trolley object 
            SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);

            ///  Get the warehouse 
            DataSet ds = new DataSet();

            ///  The trolley is unloaded to the warehouse 
            adapter.Fill(ds, "hero_table");

            ///  Give Way datagridview The data source of points to the data table in the warehouse 
            ///  Data network view object . data source  =  Tables in the warehouse 
            dgvSanguo.DataSource = ds.Tables["hero_table"];
        }
    }

Column set

Add columns to the column set
At the same time, set the display text of the column object

Currently, only columns have been added
The system does not know what data this column should display

Tell the system what to display in the current column

according to sql Statement

Root us sql Statement to point to the column data

result

Disable automatic column generation

dgvSanguo.AutoGenerateColumns = false;

Close the leftmost column

Select the whole line

selectionMode
FullRowSelect

Let the column be covered with dgv

The user is not allowed to add rows at the least position

            ///  allow allow user user towards to add to add That's ok row Add data in the last row 
            dgvSanguo.AllowUserToAddRows = false;

Trolley update data

            //  Directly upgrade the trolley   Let the trolley return the updated data 
            new SqlCommandBuilder(adapter);

            //  Trolley update data 
            adapter.Update(ds, "hero_table");

Selected row set

Number of tests

        private void button2_Click(object sender, EventArgs e)
        {
    
            //  Get the selected row set , Be similar to listview Control selectedItems
            int c = dgvSanguo.SelectedRows.Count;
            MessageBox.Show(c.ToString());
        }

A collection of cells in rows

Number of test cells

        private void button2_Click(object sender, EventArgs e)
        {
    
            //  Get the selected row set , Be similar to listview Control selectedItems
            int c = dgvSanguo.SelectedRows[0].Cells.Count;
            MessageBox.Show(c.ToString());
        }

Get cell value

        private void button2_Click(object sender, EventArgs e)
        {
    
            String v = dgvSanguo.SelectedRows[0].Cells[1].Value.ToString();
            MessageBox.Show(v);
        }

Get the selected row in dgv Subscript positions of all rows in the

            int idx = dgvSanguo.SelectedRows[0].Index;
            MessageBox.Show(idx.ToString());