winform datagridview tooptip 设置气泡方向朝上。

当鼠标运行到单元格时，出现气泡，并且气泡朝上。

如图：

 关键函数是：tooltip中的函数SetToolTip。

代码如下：

 

 1    private void dgv1_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
 2         {
 3             if (e.RowIndex < 0 || e.ColumnIndex < 0)
 4             {
 5                 return;
 6             }
 7            
 8             this.toolTip1.Hide(this.dgv1);
 9 
10             this.CellColumnIndex = e.ColumnIndex;
11             this.CellRowIndex = e.RowIndex;
12             if (this.CellColumnIndex >= 0 && this.CellRowIndex >= 0)
13             {
14                 DataGridViewCell dgvc = this.dgv1[this.CellColumnIndex, this.CellRowIndex];
15                  Rectangle rec = dgvc.ContentBounds;
16                 string tip = "Tip is " + dgvc.Value.ToString();
17                 this.toolTip1.SetToolTip(dgv1, tip);
18 
19             }
20              
21         }

 若要让气泡的方向向下，可以使用这个函数Show();

 

 

代码如下;

 1 private void dgv1_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
 2         {
 3             if (e.RowIndex < 0 || e.ColumnIndex < 0)
 4             {
 5                 return;
 6             }
 7            
 8             this.toolTip1.Hide(this.dgv1);
 9 
10             this.CellColumnIndex = e.ColumnIndex;
11             this.CellRowIndex = e.RowIndex;
12             if (this.CellColumnIndex >= 0 && this.CellRowIndex >= 0)
13             {
14               int dgvY = dgv1.Location.Y;
15                 int dgvX = dgv1.Location.X;
16                 int cellX = dgv1.GetCellDisplayRectangle(CellColumnIndex,CellRowIndex,false).X;
17                 int cellY = dgv1.GetCellDisplayRectangle(CellColumnIndex,CellRowIndex,false).Y;
18                 int x = dgvX + cellX;
19                 int y = dgvY + cellY+5; 
20                 DataGridViewCell dgvc = this.dgv1[this.CellColumnIndex, this.CellRowIndex];
21                // Point mousePos = PointToClient(MousePosition);
22                 Point mousePos = new Point(x, y);
23                  Rectangle rec = dgvc.ContentBounds;
24                 string tip = "Tip is " + dgvc.Value.ToString()+" "+x+" "+y;
25  
26                 this.toolTip1.Show(tip, this.dgv1, mousePos);
27                 //this.toolTip1.SetToolTip(dgv1, tip);
28 
29             }
30              
31         }