C#实例：datagridview单元格合并

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms;   namespace WindowsFormsApp28 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }         Button btn1 = new Button();         private void Form1_Load(object sender, EventArgs e)         {             DataTable dt = new DataTable();             dt.Columns.Add("IP");             dt.Columns.Add("Option");             dt.Columns.Add("button");             dt.Rows.Add("192.168.1.10", null, null);             dt.Rows.Add("192.168.1.11", null, null);             dt.Rows.Add("192.168.1.12", null, null);             dt.Rows.Add("192.168.1.13", null, null);             dt.Rows.Add("192.168.1.14", null, null);             dt.Rows.Add("192.168.1.15", null, null);             dt.Rows.Add("192.168.1.16", null, null);             dt.Rows.Add("192.168.1.17", null, null);             dt.Rows.Add("192.168.1.18", null, null);             dt.Rows.Add("192.168.1.19", null, null);             dataGridView1.DataSource = dt;              //var list = new List<Object>();             //list.Add(new { IP = "192.168.1.10", Option = "null", button = "null" });             //list.Add(new { IP = "192.168.1.11", Option = "null", button = "null" });             //list.Add(new { IP = "192.168.1.12", Option = "null", button = "null" });             //list.Add(new { IP = "192.168.1.13", Option = "null", button = "null" });             //list.Add(new { IP = "192.168.1.14", Option = "null", button = "null" });             //list.Add(new { IP = "192.168.1.15", Option = "null", button = "null" });             //dataGridView1.DataSource = list;              DataGridViewCheckBoxColumn newColumn1 = new DataGridViewCheckBoxColumn();             newColumn1.HeaderText = "选择";             //dataGridView1.Columns.Add(newColumn);             dataGridView1.Columns.Insert(3, newColumn1);             DataGridViewButtonColumn newColumn2 = new DataGridViewButtonColumn();             newColumn2.HeaderText = "控件";             //dataGridView1.Columns.Add(newColumn);             dataGridView1.Columns.Insert(4, newColumn2);              dt.Columns.Add("action");             dataGridView1.Rows[0].Cells[0].Value = true;             //dataGridView1.Rows[0].Cells[1].Value = true;                          btn1.Name = "btnRun";             btn1.Text = "Run";             btn1.Visible = true;             btn1.Location = new Point(550, 80);             btn1.Size = new Size(80, 50);             btn1.Parent = this;             btn1.Click += new EventHandler(btn1_Click);             //this.Controls.Add(btn1);             dataGridView1.Controls.Add(btn1);          }         private void btn1_Click(object sender, EventArgs e)         {              // MessageBox.Show("123");             for (int i = 0; i < dataGridView1.Rows.Count; i++)             {                 string otherValue = dataGridView1.Rows[i].Cells[0].EditedFormattedValue.ToString();                 if (otherValue == "True")                     MessageBox.Show(dataGridView1.Rows[i].Cells[2].Value.ToString());              }         }           private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)         {             if (e.ColumnIndex == dataGridView1.Columns[1].Index)                 MessageBox.Show(dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString());          }         /// <summary>         /// 将当前单元格中的更改提交到数据缓存，但不结束编辑模式，及时获得其状态是选中还是未选中             /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)         {             if (dataGridView1.IsCurrentCellDirty)             {                 dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);             }          }          private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)         {              try             {                 if (dataGridView1.Rows.Count > 0)                 {                     int rowIndex = dataGridView1.CurrentCell.RowIndex;                     int colIndex = dataGridView1.CurrentCell.ColumnIndex;                     if (colIndex == 0) //第一列                     {                         string _selectValue = dataGridView1.CurrentCell.EditedFormattedValue.ToString();                         if (_selectValue == "True")                         {                             for (int i = 0; i < dataGridView1.Rows.Count; i++)                             {                                 if (i != rowIndex)                                 {                                     string otherValue = dataGridView1.Rows[i].Cells[0].EditedFormattedValue.ToString();                                     if (otherValue == "True")                                     {                                         ((DataGridViewCheckBoxCell)dataGridView1.Rows[i].Cells[0]).Value = false;                                     }                                                                    }                             }                         }                     }                  }              }             catch (Exception ex)             { }         }          private void button1_Click(object sender, EventArgs e)         {          }          private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)         {             // 对第5列相同单元格进行合并              if (e.ColumnIndex == 5 && e.RowIndex != -1)             {                 using                 (                 Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor),                 backColorBrush = new SolidBrush(e.CellStyle.BackColor)                 )                 {                     using (Pen gridLinePen = new Pen(gridBrush))                     {                         // 清除单元格                          e.Graphics.FillRectangle(backColorBrush, e.CellBounds);                          // 画 Grid 边线（仅画单元格的底边线和右边线）                          // 如果下一行和当前行的数据不同，则在当前的单元格画一条底边线                          if (e.RowIndex < dataGridView1.Rows.Count - 1 &&                         dataGridView1.Rows[e.RowIndex ].Cells[e.ColumnIndex].Value.ToString() !=                         e.Value.ToString())                             e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left + 2,                             e.CellBounds.Bottom - 1, e.CellBounds.Right - 1,                             e.CellBounds.Bottom - 1);                         //画最后一条记录的底线                          if (e.RowIndex == dataGridView1.Rows.Count - 1)                             e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left + 2,                             e.CellBounds.Bottom - 1, e.CellBounds.Right - 1,                             e.CellBounds.Bottom - 1);                         // 画右边线                          e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1,                         e.CellBounds.Top, e.CellBounds.Right - 1,                         e.CellBounds.Bottom);                          // 画左边线                          e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left ,                         e.CellBounds.Top, e.CellBounds.Left ,                         e.CellBounds.Bottom);                          // 画（填写）单元格内容，相同的内容的单元格只填写第一个                          if (e.Value != null)                         {                             if (e.RowIndex > 0 &&                             dataGridView1.Rows[e.RowIndex - 1].Cells[e.ColumnIndex].Value.ToString() ==                             e.Value.ToString())                             {                              }                             else                             {                                 //e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,                                 //Brushes.Black, e.CellBounds.X + 2,                                 //e.CellBounds.Y + 5, StringFormat.GenericDefault);                             }                         }                         e.Handled = true;                     }                 }                               }         }              } }