c# 使用按钮向上或向下移动数据网格视图

Question

我已经为我目前面临的问题创建了一个示例程序。由于 windows 对象的性质，您不能简单地将对象或整数转换为只读数据网格视图，因此我无法复制数据集的当前位置并将该位置用于数据网格看法。我已经设法让数据网格视图在单击单元格时显示所选视图，尽管它无法使用按钮进行导航。下面是示例图片；

如您所见，文本框中的值与数据网格视图不同，我的目的是从按钮的使用中移动所选值，这将匹配文本框中的相同值。

    private void fill_table()
    {
        SqlConnection connection = new SqlConnection();
        try
        {
            connection.ConnectionString = connectionPath;
            connection.Open();

            SqlCommand cmd = new SqlCommand("SELECT * FROM Users", connection);
            SqlDataAdapter dap = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            dap.Fill(ds);

            bs.DataSource = ds.Tables[0];
            dgv.DataSource = bs;
            dap.Update(ds);              

            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                object u = dr["Username"];
                string conversion_u = (string)u;
                string decrypted_u = Decrypt(conversion_u.Trim(), password);
                dr["Username"] = decrypted_u;

                object p = dr["Password"];
                string conversion_p = (string)p;
                string decrypted_p = Decrypt(conversion_p.Trim(), password);
                dr["Password"] = decrypted_p;

                object t = dr["Time"];
                string conversion_t = (string)t;
                string decrypted_t = Decrypt(conversion_t.Trim(), password);
                dr["Time"] = decrypted_t;
            }

        }
        catch (SqlException sql)
        {
            MessageBox.Show(sql.Message);
        }
        finally
        {
            connection.Close();
            connection.Dispose();
        }
    }

这是在数据网格视图对象中加载值的当前代码

    private void btnFirst_Click(object sender, EventArgs e)
    {
        if (inc != MaxRows + 1)
        {
            inc = 0;
            MaxRows = 0;
            fill_textBoxes();
        }

    }

    private void btnPrevious_Click(object sender, EventArgs e)
    {
        try
        {
            if (inc != MaxRows + 1)
            {
                inc--;
                fill_textBoxes();
            }
        }
        catch (IndexOutOfRangeException)
        {
            DialogResult dlgResult;
            dlgResult = MessageBox.Show(
                    "First record",
                    "Records",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Warning,
                    MessageBoxDefaultButton.Button1);
        }
    }

    private void btnNext_Click(object sender, EventArgs e)
    {
        if (inc != MaxRows - 1)
        {
            inc++;
            fill_textBoxes();
        }
        else
            MessageBox.Show("No more records");
    }

    private void btnLast_Click(object sender, EventArgs e)
    {
        if (inc != MaxRows - 1)
        {
            inc = MaxRows - 1;
            fill_textBoxes();

        }
    }
    private void dgv_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        if (e.RowIndex >= 0)
        {
            DataGridViewRow row = dgv.Rows[e.RowIndex];

            txtdeuser.Text = row.Cells["Username"].Value.ToString();
            txtdepass.Text = row.Cells["Password"].Value.ToString();
            dtp.Text = row.Cells["Time"].Value.ToString();
        }
    }

这是当前用于文本框导航和在数据网格视图中单击值时更改字段的代码。

Answer 1

这是我设法让它工作的代码

    pos = dgv.CurrentCell.RowIndex;

    private void btnFirst_Click(object sender, EventArgs e)
    {
        if (inc != MaxRows + 1)
        {
            inc = 0;
            MaxRows = 0;
            fill_textBoxes();

            if (pos < dgv.RowCount)
            {
                dgv.Rows[pos].Selected = false;
                dgv.Rows[pos = 0].Selected = true;
            }
        }           
    }
    private void btnPrevious_Click(object sender, EventArgs e)
    {
        try
        {
            if (inc != MaxRows + 1)
            {
                inc--;
                fill_textBoxes();

                if (pos < dgv.RowCount)
                {
                    dgv.Rows[pos].Selected = false;
                    dgv.Rows[--pos].Selected = true;
                }
            }
        }
        catch (IndexOutOfRangeException)
        {
            DialogResult dlgResult;
            dlgResult = MessageBox.Show(
                    "First record",
                    "Records",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Warning,
                    MessageBoxDefaultButton.Button1);
        }
    }

    private void btnNext_Click(object sender, EventArgs e)
    {
        if (inc != MaxRows - 1)
        {
            inc++;
            fill_textBoxes();

            if (pos < dgv.RowCount)
            {
                dgv.Rows[pos].Selected = false;
                dgv.Rows[++pos].Selected = true;
            }
        }
        else
            MessageBox.Show("No more records");
    }

    private void btnLast_Click(object sender, EventArgs e)
    {
        if (inc != MaxRows - 1)
        {
            inc = MaxRows - 1;
            fill_textBoxes();

            if (pos < dgv.RowCount)
            {
                dgv.Rows[pos].Selected = false;
                dgv.Rows[pos = MaxRows - 1].Selected = true;
            }
        }
    }

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