C#如何实现DataGridView到DataGridView的拖拽
今天工作中遇到一个问题,需要将一个DataGridView中的某一行拖拽到另一个DataGridView中,在网上搜了一遍,大多是从DataGridView拖拽到TextBox等控件,没有拖拽到
DataGridView中的。拖拽到TextBox很容易,但拖拽到DataGridView就有一个问题:如何决定拖拽到DataGridView中的哪一个Cell?
为此研究了两个小时,终于找到了答案。
例如要实现从gridSource到gridTarget的拖拽,需要一个设置和三个事件:
1、设置gridTarget的属性AllowDrop为True
2、实现gridSource的MouseDown事件,在这里进行要拖拽的Cell内容的保存,保存到剪贴板。
3、实现gridTarget的DragDrop和DragEnter事件,DragDrop事件中的一个难点就是决定拖拽到哪一个Cell
代码如下:
gridSource的MouseDown事件:
Code
private void gridSource_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
DataGridView.HitTestInfo info = this.gridSource.HitTest(e.X, e.Y);
if (info.RowIndex >= 0)
{
if (info.RowIndex >= 0 && info.ColumnIndex >= 0)
{
string text = (String)this.gridSource.Rows[info.RowIndex].Cells[info.ColumnIndex].Value;
if (text != null)
{
this.gridSource.DoDragDrop(text, DragDropEffects.Copy);
}
}
}
}
}
private void gridSource_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
DataGridView.HitTestInfo info = this.gridSource.HitTest(e.X, e.Y);
if (info.RowIndex >= 0)
{
if (info.RowIndex >= 0 && info.ColumnIndex >= 0)
{
string text = (String)this.gridSource.Rows[info.RowIndex].Cells[info.ColumnIndex].Value;
if (text != null)
{
this.gridSource.DoDragDrop(text, DragDropEffects.Copy);
}
}
}
}
}
gridTarget的DragDrop事件:
Code
private void gridTarget_DragDrop(object sender, DragEventArgs e)
{
//得到要拖拽到的位置
Point p = this.gridTarget.PointToClient(new Point(e.X, e.Y));
DataGridView.HitTestInfo hit = this.gridTarget.HitTest(p.X, p.Y);
if (hit.Type == DataGridViewHitTestType.Cell)
{
DataGridViewCell clickedCell = this.gridTarget.Rows[hit.RowIndex].Cells[hit.ColumnIndex];
clickedCell.Value = (System.String)e.Data.GetData(typeof(System.String));
//如果只想允许拖拽到某一个特定列,比如Target Field Expression,则先要判断列是否为Target Field Expression,如下:
//if (0 == string.Compare(clickedCell.OwningColumn.Name, "Target Field Expression"))
//{
// clickedCell.Value = (System.String)e.Data.GetData(typeof(System.String));
//}
}
}
private void gridTarget_DragDrop(object sender, DragEventArgs e)
{
//得到要拖拽到的位置
Point p = this.gridTarget.PointToClient(new Point(e.X, e.Y));
DataGridView.HitTestInfo hit = this.gridTarget.HitTest(p.X, p.Y);
if (hit.Type == DataGridViewHitTestType.Cell)
{
DataGridViewCell clickedCell = this.gridTarget.Rows[hit.RowIndex].Cells[hit.ColumnIndex];
clickedCell.Value = (System.String)e.Data.GetData(typeof(System.String));
//如果只想允许拖拽到某一个特定列,比如Target Field Expression,则先要判断列是否为Target Field Expression,如下:
//if (0 == string.Compare(clickedCell.OwningColumn.Name, "Target Field Expression"))
//{
// clickedCell.Value = (System.String)e.Data.GetData(typeof(System.String));
//}
}
}
gridTarget的DragEnter事件:
Code
private void gridTarget_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
}
private void gridTarget_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
}