C# 要通过鼠标c选择datagridview文本框列文本的部分文本吗

我有三列的DataGridView，所有三列都是DataGridViewTextBoxColumn，现在我想用鼠标选择单元格文本。我尝试了以下方法：

dgView.ReadOnly = false;
private void dgView_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    if (e.Control is TextBox)
    {
        (e.Control as TextBox).ReadOnly = true;
    }
}

但是这个技巧不起作用。

如果你的 dataGridView 有

属性选择为false，则只能通过鼠标从单元格中复制该值，使用如下代码：

public void Form1()
{
 //here is code of constructor
 .....
 contextMenuStrip1 = new ContextMenuStrip();
 System.Windows.Forms.ToolStripMenuItem copyStripMenuItem;
 copyStripMenuItem = new ToolStripMenuItem();
 this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
 copyStripMenuItem });
 this.contextMenuStrip1.Name = "contextMenuStrip1";
 this.contextMenuStrip1.Size = new System.Drawing.Size(169, 98);
 copyStripMenuItem.Name = "copyToolStripMenuItem1";
 copyStripMenuItem.Size = new System.Drawing.Size(168, 22);
 copyStripMenuItem.Text = "Copy";
 copyStripMenuItem.Click += new EventHandler(copyStripMenuItem_Click);

 dataGridView1.ContextMenuStrip = contextMenuStrip1;
 ....
 }

 void copyStripMenuItem_Click(object sender, EventArgs e)
 {
    CellCopy();
 }
 public void CellCopy()
 {
    DataGridViewCell cell = dataGridView1.CurrentCell;
    if (cell != null)
    {
       DataGridViewColumn col = dataGridView1.Columns[cell.ColumnIndex];
            if (col is DataGridViewTextBoxColumn)
            {
                if (cell.IsInEditMode)
                {
                    TextBox txt = dataGridView1.EditingControl as TextBox;
                    if (txt != null)
                        txt.Copy();
                }
                else
                {
                    string val = cell.FormattedValue == null ? "" : cell.FormattedValue.ToString();
                    if (val == "")
                        Clipboard.Clear();
                    else
                        Clipboard.SetText(val);
                }
            }
        }
    }

更新

此外，如果需要通过鼠标单击来复制dataGridView1值，可以这样编写

 public void Form1_Load(object sender, EventArgs e)
 {  
  there is some code of constructor here
.....
dataGridView1.CellContentDoubleClick+=new DataGridViewCellEventHandler(dataGridView1_CellContentDoubleClick);
......
 }
  void dataGridView3_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
    {
        CellCopy();
    }

     /// <summary>
    /// Copy the current value in the buffer
    /// </summary>
    public void CellCopy()
    {
        DataGridViewCell cell = dataGridView1.CurrentCell;
        if (cell != null)
        {
            DataGridViewColumn col = dataGridView1.Columns[cell.ColumnIndex];
            if (col is DGW_NewCellsColumn)
            {
                if (cell.IsInEditMode)
                {
                    TextBox txt = dataGridView1.EditingControl as TextBox;
                    if (txt != null)
                        txt.Copy();
                }
                else
                {
                    string val = cell.FormattedValue == null ? "" :  cell.FormattedValue.ToString();
                    if (val == "")
                        Clipboard.Clear();
                    else
                        Clipboard.SetText(val);
                }
            }
        }
    }

---

谢谢你的回答，但我想用鼠标复制文本，而不是点击任何菜单。请参阅我回答的更新部分。我感谢你的努力，但我想用鼠标选择文本的一部分。我的意思是我们拖动鼠标并选择文本的一部分。我希望我清楚自己想要实现的目标。我不想点击单元格来复制文本，而是想拖动鼠标来选择文本。谢谢我投票支持你的努力。对不起，我误解了。但在我看来，要实现您试图实现的dataGridView行为是不可能的，除非将grid AllowUserToAddress和AllowUserToEditRows的属性设置为true。

 public void Form1_Load(object sender, EventArgs e)
 {  
  there is some code of constructor here
.....
dataGridView1.CellContentDoubleClick+=new DataGridViewCellEventHandler(dataGridView1_CellContentDoubleClick);
......
 }
  void dataGridView3_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
    {
        CellCopy();
    }

     /// <summary>
    /// Copy the current value in the buffer
    /// </summary>
    public void CellCopy()
    {
        DataGridViewCell cell = dataGridView1.CurrentCell;
        if (cell != null)
        {
            DataGridViewColumn col = dataGridView1.Columns[cell.ColumnIndex];
            if (col is DGW_NewCellsColumn)
            {
                if (cell.IsInEditMode)
                {
                    TextBox txt = dataGridView1.EditingControl as TextBox;
                    if (txt != null)
                        txt.Copy();
                }
                else
                {
                    string val = cell.FormattedValue == null ? "" :  cell.FormattedValue.ToString();
                    if (val == "")
                        Clipboard.Clear();
                    else
                        Clipboard.SetText(val);
                }
            }
        }
    }