Question

我有这个代码，我正在尝试从Windows应用程序中的C＃gridview更改中更新数据库....

在更新按钮单击事件...

中声明适配器选择命令时会出现此问题

我不确定使用哪个select命令或更新命令，以便更新数据库表中的datagridview更改....

有人能指出我正确的方向来解决这个问题吗？

public partial class KnowledgeBaseForm : Form
{
    private SqlDataAdapter SDA = new SqlDataAdapter();

    private void button_retrievekb_Click(object sender, EventArgs e)
    {
        try
        {
            con.Open();
            SqlDataAdapter SDA = new SqlDataAdapter(@"SELECT * From Table1", con);

            DT = new DataTable();
            SDA.Fill(DT);

            bindingsource.DataSource = DT;
            dataGridView.DataSource = bindingsource;

            if (DT.Rows.Count > 0)
            {
                dataGridView.Columns[0].DefaultCellStyle.ForeColor = Color.Gray;
                dataGridView.Columns[0].ReadOnly = true;
            }
            else
            {
                MessageBox.Show("No Knowledge Base Rules Found");
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error : " + ex.Message);
        }
        finally
        {
            con.Close();
        }
    }   
}

private void button_update_Click(object sender, EventArgs e)
{
    if (MessageBox.Show("Do you really want to Update these values?", "Confirm Update", MessageBoxButtons.YesNo) == DialogResult.Yes)
    {
        //binding the datasource with the changes made in the gridview
        bindingsource.DataSource = dataGridView.DataSource;
        SDA.SelectCommand = (//some necessary command or NULL update command which needs to update my database);

        scb = new SqlCommandBuilder(SDA);                 
        SDA.Update((DataTable) bindingsource.DataSource);
        MessageBox.Show("Updates successfully submitted to CoSD");
    }
}

Answer 1

您可能需要考虑在对与其关联的数据源（例如DataSource）进行任何更改后更新网格的bindingSource属性。

可能类似以下内容：

SDA.Update((DataTable) bindingsource.DataSource);
// After updating everything, rebind your grid
dataGridView.DataSource = bindingsource.DataSource;

在c＃Winforms中，应该使用什么数据适配器命令通过gridview更新数据库表？

1 个答案: