C#实例：datagridview单元格合并

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 这是替C#微信交流群群友做的一个小实例，目的就是在datagridview选择对应行以后，点击button后获取对应行的ip，并执行相应的操作，其实我觉得这样的话button没必要非放置到datagridview里面的！但是为了满足群友的需求，还是这么做了。

先看一下运行效果：

1. DataGridView 添加一列checkbox

DataGridViewCheckBoxColumn newColumn = new DataGridViewCheckBoxColumn();
newColumn.HeaderText = "选择";
dataGridView1.Columns.Add(newColumn);

这样添加的列是放在最后一列，也许你希望它在其它列，例如第二列，那么可以：
dataGridView1.Columns.Insert(1, newColumn);

2. DataGridView 添加一个button

            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);

3. datagridview合并单元格，详见完整代码.

完整代码：

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;
                    }
                }
                

            }
        }

       
    }
}

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