Datagrid cellvaluechanged 动态对象的事件处理程序

Question

我正在以编程方式创建一个数据网格，我想从用户那里获取已更改的单元格的值，以便将其添加到另一个数据网格中。

我的代码是这样的：

connTo.Open();
SqlDataReader sqlFromReader1 = null;
SqlDataReader sqlFromReader2 = null;
SqlDataReader sqlFromReader3 = null;
SqlCommand myFromCommand1 = new SqlCommand("select distinct m.catid1, c.descr "+
"from material m "+
"inner join cat1 c on c.id = m.catid1", connTo);
sqlFromReader1 = myFromCommand1.ExecuteReader();
DataTable dt1 = new DataTable();
dt1.Load(sqlFromReader1);
for (i = 0; i < dt1.Rows.Count; i++)
{
    //int c1 = (int)(dt1.Rows[i]["catid1"]);
    TabPage tbg = new TabPage(dt1.Rows[i]["descr"].ToString());
    tabControl1.Controls.Add(tbg);
    TabControl tbi = new TabControl();
    tbi.Name = i.ToString() + i.ToString();
    SqlCommand myFromCommand2 = new SqlCommand(
        "select distinct m.catid2, c.descr " +
        "from material m " +
        "inner join cat2 c on c.id = m.catid2 "+
        "and m.catid1 = " + dt1.Rows[i]["catid1"].ToString(), connTo);
        sqlFromReader2 = myFromCommand2.ExecuteReader();
    DataTable dt2 = new DataTable();
    dt2.Load(sqlFromReader2);
    for (int k = 0; k < dt2.Rows.Count; k++)
    {
        //int c2 = (int)(dt2.Rows[k]["catid2"]);
        TabPage tbgi = new TabPage(dt2.Rows[k]["descr"].ToString());
        tbi.Controls.Add(tbgi);
        tbi.Left = 1;
        tbi.Top = 1;
        tbi.Width = 880;
        tbi.Height = 400;

        DataGridView gv = new DataGridView();
        gv.Width = 850;
        gv.Height = 340;            
        gv.Left = 10;
        gv.Top = 10;
        gv.ColumnCount = 4;
        gv.Columns[0].Name = "code";
        gv.Columns[0].Width = 120;
        gv.Columns[0].ReadOnly = true;
        gv.Columns[1].Name = "name";
        gv.Columns[1].Width = 450;
        gv.Columns[1].ReadOnly = true;
        gv.Columns[2].Name = "price";
        gv.Columns[2].Width = 80;
        gv.Columns[2].ReadOnly = true;
        gv.Columns[3].Name = "qty";
        gv.Columns[3].Width = 120;
        SqlCommand myFromCommand3 = new SqlCommand(
            "select m.code, m.descr, m.cost1 price " +
            "from material m " +
            "where m.catid1 = " + dt1.Rows[i]["catid1"].ToString() + " " +
            "and m.catid2 = " + dt2.Rows[k]["catid2"].ToString(), connTo);
        sqlFromReader3 = myFromCommand3.ExecuteReader();
        DataTable dt3 = new DataTable();
        dt3.Load(sqlFromReader3);
        for (int l = 0; l < dt3.Rows.Count; l++)
        {
            gv.Rows.Add(dt3.Rows[l]["code"].ToString(), dt3.Rows[l]["descr"].ToString(), dt3.Rows[l]["price"].ToString(), "");
        }
        tbgi.Controls.Add(gv);                       
    }
    tbg.Controls.Add(tbi);

现在我想抓住用户何时更改 gv 的值。列[3]。名称 （"qty"） 将此值和行数据的其余部分添加到新数据列表中。

怎么能做到这一点？这可能吗？

Answer 1

在这种情况下，CellValueChanged事件应该有效。

创建每个新的DataGridView实例并将其添加到选项卡时，只需添加一个事件处理程序：

dataGridView1.CellValueChanged += new DataGridViewCellEventHandler(dataGridView1_CellValueChanged);

然后，您将方法dataGridView1_CellValueChanged在所有事件处理程序使用的位置。

CellValueChanged 事件处理程序的签名采用DataGridViewCellEventArgs，该签名具有更改的列索引和行索引的属性。所以你有这样的代码：

void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex == 3)
    {
        // Now you can cast sender to a DataGridView and copy the row at e.RowIndex
        DataGridView dgv = sender as DataGridView;
        if (dgv == null)
            return;
        // Here you get the cell value
        var cellValue = dgv.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
    }
}

我还建议将 dt3 分配为数据源。如果您确实使用数据源而不是未绑定的网格，则行的复制将更加干净。