Question

我试图在DataGridView edit中添加一些防弹。

第0,1,2,3,4列必须具有符合数据表主键和SQL表约束的值。

如果任何列为空，我会在数据表主键上获得内部异常，或在非可空列上获得SQL异常。

在LeaveRow事件中，如果任何列值为空，我会调用CancelUpdate()。问题是当CancelUpdate()执行时，它将控制权传递给事件的顶部并重新开始。

这是CancelUpdate()的正确行为吗？
鉴于我的既定目标，我还有另一种方法可以完成吗？

。

private void dgvVX130_LeaveRow(object sender, DataGridViewCellEventArgs e)
{      
    bool z = true; // <======= CancelUpdate() passes execution to here
    switch (dgvVX130.CurrentCell.ColumnIndex.ToString())
    {
        case "0":
            if (dgvVX130.IsCurrentRowDirty && 
                (dgvVX130.CurrentRow.Cells[1].Value.ToString() == "" || 
                dgvVX130.CurrentRow.Cells[2].Value.ToString() == "" || 
                dgvVX130.CurrentRow.Cells[3].Value.ToString() == ""))
            {
                z = false;
                dgvVX130.CancelEdit(); // <=== Passes execution to top of event
                MessageBox.Show("You must have Database, Schema, and TableName " +
                    "defined before leaving row"); // <===== Doesn't get executed
            }
            break;
        case "1":
            // Additional code is irrelevant
            break;
    }
}

Answer 1

采用LarsTech建议我探索并使用了RowValidating事件。就像将CancelEventArgs.Cancel属性设置为true一样简单。（e.Cancel = True;）

private void dgvVX130_RowValidating(object sender, DataGridViewCellCancelEventArgs e)
        {
            switch (dgvVX130.CurrentCell.ColumnIndex.ToString())
            {
                case "0":
                    if (dgvVX130.IsCurrentRowDirty && (dgvVX130.CurrentRow.Cells[1].Value.ToString() == "" 
                        || dgvVX130.CurrentRow.Cells[2].Value.ToString() == "" 
                        || dgvVX130.CurrentRow.Cells[3].Value.ToString() == ""))
                    {
                        e.Cancel = true;
                        MessageBox.Show("You must have Database, Schema, and TableName defined before leaving row");
                    }
                    break;
                case "1":
                    if (dgvVX130.IsCurrentRowDirty && (dgvVX130.CurrentRow.Cells[0].Value.ToString() == "" 
                        || dgvVX130.CurrentRow.Cells[2].Value.ToString() == "" 
                        || dgvVX130.CurrentRow.Cells[3].Value.ToString() == ""))
                    {
                        e.Cancel = true;
                        MessageBox.Show("You must have Database, Schema, and TableName defined before leaving row");
                    }
                    break;

CancelEdit（）传递不需要的控件。我还可以做些什么？

1 个答案: