C# DataGridView添加右键菜单等技巧
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1).右键点击行时选中行，并弹出操作菜单1). 添加一个快捷菜单contextMenuStrip1；2). 给dataGridView1的CellMouseDown事件添加处理程序：复制内容到剪贴板程序代码private void DataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e){if (e.Button == MouseButtons.Right){if (e.RowIndex >= 0){//若行已是选中状态就不再进行设置if (dataGridView1.Rows[e.RowIndex].Selected == false){dataGridView1.ClearSelection();dataGridView1.Rows[e.RowIndex].Selected = true;}//只选中一行时设置活动单元格if (dataGridView1.SelectedRows.Count == 1){dataGridView1.CurrentCell =dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];}//弹出操作菜单contextMenuStrip1.Show(MousePosition.X, MousePosition.Y);}}}效果图：2).复制选中单元格的内容到剪贴板复制内容到剪贴板程序代码Clipboard.SetDataObject(dataGridView1.GetClipboardContent());3).只显示自定义列复制内容到剪贴板程序代码dataGridView1.AutoGenerateColumns = false;//必须在代码中设置4).显示图片通常，我们将图片路径保存在数据库中，但在dataGridView1中要显示图片，可以进行如下操作：①.添加一个DataGridViewTextBoxColumn类型的列，Name=Path,DataPropertyName=Pic,Visible=False；②.添加一个DataGridViewImageColumn类型的列，Name=Pic；③.dataGridView1控件DataBindingComplete事件处理程序如下：复制内容到剪贴板程序代码private void DataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e){Image image1 = null;Image image2 = null;string path = string.Empty;for (int i = 0; i < dataGridView1.Rows.Count; i++){path = @"F:\" + dataGridView1.Rows[i].Cells["Path"].Value;if (File.Exists(path)){image1 = Image.FromFile(path);image2 = new Bitmap(image1, 120, 120);//重设大小dataGridView1.Rows[i].Cells["Pic"].Value = image2;//((DataGridViewImageCell)dataGridView1.Rows[i].Cells["Pic"]).Value = image2; }}}5).当网格未填充满控件时，画线来填充空白区域复制内容到剪贴板程序代码/// <summary>/// 绘制网格填充空白区域/// </summary>/// <param name="sender"></param>/// <param name="e"></param>public void CellPainting(object sender, DataGridViewCellPaintingEventArgs e){DataGridView myDataGridView = (DataGridView)sender;if (myDataGridView.Rows.Count > 0){int i = myDataGridView.ColumnHeadersHeight;//标题行高int j = myDataGridView.Rows.GetRowsHeight(DataGridViewElementStates.Visible); //所有可见行总高int k = myDataGridView.Height; //控件高度int l = myDataGridView.Rows.GetLastRow(DataGridViewElementStates.Visible);//最后一行索引int count = myDataGridView.Columns.Count;//列总数int width = 0;//当网格未充满控件时才画线if (i + j < k){using (Brush gridBrush = new SolidBrush(myDataGridView.GridColor)){using (Pen gridLinePen = new Pen(gridBrush)){//处理标题列if (myDataGridView.RowHeadersVisible){width = myDataGridView.RowHeadersWidth;e.Graphics.DrawLine(gridLinePen, width, i + j, width, k);}else{width = 1;}//处理正常列for (int index = 0; index < count; index++){if (myDataGridView.Columns[index].Visible){width += myDataGridView.Columns[index].Width;e.Graphics.DrawLine(gridLinePen, width, i + j, width, k);}}}}}}}6).自定义列宽手动添加列，再在编辑列界面中逐个设置宽度。
注意AutoSizeColumnsMode的值必须为DataGridViewAutoSizeColumnsMode.None，否则自定义宽度不能生效！7).单元格内容格式化复制内容到剪贴板程序代码private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e){DataGridView myDataGridView = (DataGridView)sender;if (myDataGridView.Columns["ID"].Index == e.ColumnIndex){if(e.Value != null && !string.IsNullOrEmpty(e.Value.ToString()))e.Value = "BH" + string.Format("{0:D8}", int.Parse(e.Value.ToString()));}}8).打造一个漂亮的DataGridView复制内容到剪贴板程序代码//样式dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;//列宽不自动调整,手工添加列dataGridView1.RowHeadersWidth = 12;//行标题宽度固定12dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;//不能用鼠标调整列标头宽度dataGridView1.AlternatingRowsDefaultCellStyle.BackColor = Color.LemonChiffon;//奇数行背景色dataGridView1.BackgroundColor = Color.White;//控件背景色dataGridView1.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;//列标题居中显示dataGridView1.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;//单元格内容居中显示//行为dataGridView1.AutoGenerateColumns = false;//不自动创建列dataGridView1.AllowUserToAddRows = false;//不启用添加dataGridView1.ReadOnly = true;//不启用编辑dataGridView1.AllowUserToDeleteRows = false;//不启用删除dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;//单击单元格选中整行dataGridView1.MultiSelect = false;//不能多选9).判断有无滚动条复制内容到剪贴板程序代码//垂直滚动条if (dataGridView1.Rows.GetRowsHeight(DataGridViewElementStates.None) > dataGridView1.Height)MessageBox.Show("有");elseMessageBox.Show("无");//水平滚动条if(dataGridView1.Columns.GetColumnsWidth(DataGridViewElementStates.None) > dataGridView1.Width)MessageBox.Show("有");elseMessageBox.Show("无");10).为什么列标题总不居中？已经将列标题默认对齐方式设置为居中：复制内容到剪贴板程序代码dataGridView1.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;//列标题居中显示但实际的效果总是偏左了一点，原因是列可以进行排序，排序标志符号在列标题上占了空间。
