C# DataGridView不应用更改

我正在附上密码。 我正在尝试删除一个原始数据，并使用datagridview将其附加到原始数据库中。 我成功地获得了datagridview，但是修改没有保存

我不能让datagridview保存任何内容，它只会在下次发布时弹出。 事先非常感谢你

private void button2_Click(object sender, EventArgs e)
{
            SqlConnection myConnection = new SqlConnection("Data Source=MyServerName\\InstanceName;Initial Catalog="+ comboBox1.Text + ";Integrated Security=SSPI;");
                string sqlQuery = @"SELECT * from " + comboBox2.Text;
                SqlCommand cmd = new SqlCommand(sqlQuery, myConnection);

            SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataTable table = new DataTable();
                da.Fill(table);
                dataGridView1.DataSource = new BindingSource(table, null);
                myConnection.Close();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewRow item in this.dataGridView1.SelectedRows)
            {
                DialogResult question = MessageBox.Show("Are You Sure?", "Please Confirm", MessageBoxButtons.YesNo);
                if ( question == DialogResult.Yes)

                {

                   dataGridView1.Rows.RemoveAt(item.Index);
                   dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
                   myConnection.Close();

                }
                else
                {
                    myConnection.Close();
                    break;
                }
            }
        }
    }
}

尝试使用dataGridView1.Bind

代码应为：

private void button2_Click(object sender, EventArgs e)
{
            SqlConnection myConnection = new SqlConnection("Data Source=MyServerName\\InstanceName;Initial Catalog="+ comboBox1.Text + ";Integrated Security=SSPI;");
                string sqlQuery = @"SELECT * from " + comboBox2.Text;
                SqlCommand cmd = new SqlCommand(sqlQuery, myConnection);

            SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataTable table = new DataTable();
                da.Fill(table);
                dataGridView1.DataSource = new BindingSource(table, null);
                dataGridView1.DataBind();
                myConnection.Close();
}

---

从网格的SelectedRow中获取表的主键，并分别在DB table中执行删除操作

试试这个

DB脚本，在运行该脚本之前，创建一个名为TestDB的DB

C代码

用于网格绑定

 private void button2_Click(object sender, EventArgs e)
    {

        SqlConnection myConnection = new SqlConnection("Data Source=.\\;Initial Catalog=TestDB;Integrated Security=SSPI;");
        string sqlQuery = @"SELECT * from Student" ;
        SqlCommand cmd = new SqlCommand(sqlQuery, myConnection);

        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable table = new DataTable();
        da.Fill(table);
        dataGridView1.DataSource = new BindingSource(table, null);
        myConnection.Close();

    }

用于删除该行

  private void button3_Click(object sender, EventArgs e)
    {

        foreach (DataGridViewRow item in this.dataGridView1.SelectedRows)
        {
            DialogResult question = MessageBox.Show("Are You Sure?", "Please Confirm", MessageBoxButtons.YesNo);
            if ( question == DialogResult.Yes)

            {
                MessageBox.Show(item.Cells["ID"].Value.ToString());
                DeleteFromTable(Convert .ToInt32  (item.Cells["ID"].Value));

               //dataGridView1.Rows.RemoveAt(item.Index);
               //dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);




            }
            else
            {

                break;
            }
        }


    }


    public void DeleteFromTable(int primaryKey)
    {
        SqlConnection myConnection = new SqlConnection("Data Source=.\\;Initial Catalog=TestDB;Integrated Security=SSPI;");
        string sqlQuery = @"DELETE FROM Student WHERE ID = " + primaryKey + "(SELECT * from Student)";
        SqlCommand cmd = new SqlCommand(sqlQuery, myConnection);

        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable table = new DataTable();
        da.Fill(table);
        dataGridView1.DataSource = new BindingSource(table, null);
        myConnection.Close();
    }

---

我希望这能解决您的问题。

他的代码似乎是winforms。DataGridViews没有数据绑定方法。删除数据库中的行的代码在哪里，您展示的是如何从DataGridViews中删除这些行。您能举个例子吗？您能详细说明一下吗？可以举个例子吗？

  private void button3_Click(object sender, EventArgs e)
    {

        foreach (DataGridViewRow item in this.dataGridView1.SelectedRows)
        {
            DialogResult question = MessageBox.Show("Are You Sure?", "Please Confirm", MessageBoxButtons.YesNo);
            if ( question == DialogResult.Yes)

            {
                MessageBox.Show(item.Cells["ID"].Value.ToString());
                DeleteFromTable(Convert .ToInt32  (item.Cells["ID"].Value));

               //dataGridView1.Rows.RemoveAt(item.Index);
               //dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);




            }
            else
            {

                break;
            }
        }


    }


    public void DeleteFromTable(int primaryKey)
    {
        SqlConnection myConnection = new SqlConnection("Data Source=.\\;Initial Catalog=TestDB;Integrated Security=SSPI;");
        string sqlQuery = @"DELETE FROM Student WHERE ID = " + primaryKey + "(SELECT * from Student)";
        SqlCommand cmd = new SqlCommand(sqlQuery, myConnection);

        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable table = new DataTable();
        da.Fill(table);
        dataGridView1.DataSource = new BindingSource(table, null);
        myConnection.Close();
    }