Winform#01 -- DataGridView 添加按钮

1. 实现效果：

2. 代码实现：

  DataGridViewButtonColumn btnModify = new DataGridViewButtonColumn();
            btnModify.Name = "btnModify";
            btnModify.HeaderText = "便捷操作";

            dgv_all_info.Columns.Add(btnModify);

   private void dgv_all_info_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            if (e.ColumnIndex >= 0 && e.RowIndex >= 0)
            {
                if (this.dgv_all_info.Columns[e.ColumnIndex].HeaderText == "便捷操作")
                {
                    StringFormat sf = StringFormat.GenericDefault.Clone() as StringFormat;//设置重绘入单元格的字体样式
                    sf.FormatFlags = StringFormatFlags.DisplayFormatControl;
                    sf.Alignment = StringAlignment.Center;
                    sf.LineAlignment = StringAlignment.Center;
                    sf.Trimming = StringTrimming.EllipsisCharacter;

                    e.PaintBackground(e.CellBounds, false);//重绘边框

                    //设置要写入字体的大小
                    System.Drawing.Font myFont = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Underline, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
                    SizeF sizeDel = e.Graphics.MeasureString("指派", myFont);
                    SizeF sizeMod = e.Graphics.MeasureString("修改", myFont);
                    SizeF sizeLook = e.Graphics.MeasureString("关闭", myFont);

                    float fDel = sizeDel.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width); //
                    float fMod = sizeMod.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);
                    float fLook = sizeLook.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);

                    //设置每个“按钮的边界”
                    RectangleF rectDel = new RectangleF(e.CellBounds.Left, e.CellBounds.Top, e.CellBounds.Width * fDel, e.CellBounds.Height);
                    RectangleF rectMod = new RectangleF(rectDel.Right, e.CellBounds.Top, e.CellBounds.Width * fMod, e.CellBounds.Height);
                    RectangleF rectLook = new RectangleF(rectMod.Right, e.CellBounds.Top, e.CellBounds.Width * fLook, e.CellBounds.Height);
                    e.Graphics.DrawString("指派", myFont, Brushes.Black, rectDel, sf); //绘制“按钮”
                    e.Graphics.DrawString("修改", myFont, Brushes.Black, rectMod, sf);
                    e.Graphics.DrawString("关闭", myFont, Brushes.Black, rectLook, sf);
                    e.Handled = true;
                }
            }

        }

        private void dgv_all_info_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.ColumnIndex >= 0 && e.RowIndex >= 0)
            {
                Point curPosition = e.Location;//当前鼠标在当前单元格中的坐标
                if (this.dgv_all_info.Columns[e.ColumnIndex].HeaderText == "便捷操作")
                {
                    Graphics g = this.dgv_all_info.CreateGraphics();
                    System.Drawing.Font myFont = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Underline, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
                    SizeF sizeDel = g.MeasureString("指派", myFont);
                    SizeF sizeMod = g.MeasureString("修改", myFont);
                    SizeF sizeLook = g.MeasureString("关闭", myFont);
                    float fDel = sizeDel.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);
                    float fMod = sizeMod.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);
                    float fLook = sizeLook.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);

                    Rectangle rectTotal = new Rectangle(0, 0, this.dgv_all_info.Columns[e.ColumnIndex].Width, this.dgv_all_info.Rows[e.RowIndex].Height);
                    RectangleF rectDel = new RectangleF(rectTotal.Left, rectTotal.Top, rectTotal.Width * fDel, rectTotal.Height);
                    RectangleF rectMod = new RectangleF(rectDel.Right, rectTotal.Top, rectTotal.Width * fMod, rectTotal.Height);
                    RectangleF rectLook = new RectangleF(rectMod.Right, rectTotal.Top, rectTotal.Width * fLook, rectTotal.Height);
                    //判断当前鼠标在哪个“按钮”范围内
                    if (rectDel.Contains(curPosition))//指派
                        Assign();
                    else if (rectMod.Contains(curPosition))//修改
                        Modity();
                    else if (rectLook.Contains(curPosition))//关闭
                        CloseFlow();

                }
            }

        }

        public void Assign() { 
            //指派
            assign = new frmAssign();
            assign.ShowDialog();

        }

        public void Modity() {
            modify = new frmModify();
            modify.ShowDialog();
        }
        public void CloseFlow() { 
            //关闭流程
            MessageBoxButtons msgButton = MessageBoxButtons.OKCancel;
            DialogResult dr = MessageBox.Show("确定关闭流程吗？", "提示", msgButton);
            if (dr == DialogResult.OK)
            {
               // MessageBox.Show("已关闭流程.");
            }
            else
            {
              //  MessageBox.Show("已取消");
            }
        }
    }