最近的一个winform的项目中,碰到datagridview控件的第一列添加全选的功能,通常这个功能,有两种实现方式:1. 为控件添加DataGridViewCheckBoxColumn来实现,但是需要提供全选反选功能,2. 再加一个checkbox控件跟datagridview组合来实现全选反选功能。但是,感觉这两种实现效果都不是很好。网上查资料,发现一个老外的实现方法,比较简单通用。demo 代码最下面的连接给出。
他的实现方式就是:DataGridViewCheckBoxColumn的父类DataGridViewColumnHeaderCell 里面有个HeaderCell的属性,看下DataGridViewColumnHeaderCell 的继承关系,就可以知道它继承自DataGridViewCell类, 所以只需要重写DataGridViewColumnHeaderCell类的paint方法,用CheckBoxRenderer画一个Checkbox到单元格上。即可实现在datagridview的列头增加一个全选的checkbox 。以下是实现代码:
实现代码
public delegate void CheckBoxClickedHandler(bool state); public class DataGridViewCheckBoxHeaderCellEventArgs : EventArgs { bool _bChecked; public DataGridViewCheckBoxHeaderCellEventArgs(bool bChecked) { _bChecked = bChecked; } public bool Checked { get { return _bChecked; } } } class DatagridViewCheckBoxHeaderCell : DataGridViewColumnHeaderCell { Point checkBoxLocation; Size checkBoxSize; bool _checked = false; Point _cellLocation = new Point(); System.Windows.Forms.VisualStyles.CheckBoxState _cbState = System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal; public event CheckBoxClickedHandler OnCheckBoxClicked; public DatagridViewCheckBoxHeaderCell() { } protected override void Paint(System.Drawing.Graphics graphics, System.Drawing.Rectangle clipBounds, System.Drawing.Rectangle cellBounds, int rowIndex, DataGridViewElementStates dataGridViewElementState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts) { base.Paint(graphics, clipBounds, cellBounds, rowIndex, dataGridViewElementState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts); Point p = new Point(); Size s = CheckBoxRenderer.GetGlyphSize(graphics, System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal); p.X = cellBounds.Location.X + (cellBounds.Width / 2) - (s.Width / 2) ; p.Y = cellBounds.Location.Y + (cellBounds.Height / 2) - (s.Height / 2); _cellLocation = cellBounds.Location; checkBoxLocation = p; checkBoxSize = s; if (_checked) _cbState = System.Windows.Forms.VisualStyles. CheckBoxState.CheckedNormal; else _cbState = System.Windows.Forms.VisualStyles. CheckBoxState.UncheckedNormal; CheckBoxRenderer.DrawCheckBox (graphics, checkBoxLocation, _cbState); } protected override void OnMouseClick(DataGridViewCellMouseEventArgs e) { Point p = new Point(e.X + _cellLocation.X, e.Y + _cellLocation.Y); if (p.X >= checkBoxLocation.X && p.X <= checkBoxLocation.X + checkBoxSize.Width && p.Y >= checkBoxLocation.Y && p.Y <= checkBoxLocation.Y + checkBoxSize.Height) { _checked = !_checked; if (OnCheckBoxClicked != null) { OnCheckBoxClicked(_checked); this.DataGridView.InvalidateCell(this); } } base.OnMouseClick(e); } }
调用方式
DataGridViewCheckBoxColumn colCB = new DataGridViewCheckBoxColumn(); DatagridViewCheckBoxHeaderCell cbHeader = new DatagridViewCheckBoxHeaderCell(); colCB.HeaderCell = cbHeader; datagridview1.Columns.Add(colCB);
cbHeader.OnCheckBoxClicked += new CheckBoxClickedHandler(cbHeader_OnCheckBoxClicked);
1. 我们只需要定义一个DataGridViewCheckBoxColumn。
2. 然后为每一行的checkbox 定义一个CheckboxClicked 事件。
测试程序
创建一个Winform 项目,加个datagridview控件,初始化几行默认数据。注意:datagirdview有编辑状态,如果有一行数据在编辑状态,那这一行被编辑。
解决办法就是在事件的绑定方法里面增加EndEdit()调用。
public partial class Form1 : Form { public Form1() { InitializeComponent(); InitDtSource(); } private void cbHeader_OnCheckBoxClicked(bool state) { //这一句很重要结束编辑状态 dgInfo.EndEdit(); dgInfo.Rows.OfType<DataGridViewRow>().ToList().ForEach(t => t.Cells[0].Value = state); } private void InitDtSource() { try { var _dtSource = new DataTable(); //1、添加列 _dtSource.Columns.Add("姓名", typeof(string)); //数据类型为 文本 _dtSource.Columns.Add("身份证号", typeof(string)); //数据类型为 文本 _dtSource.Columns.Add("时间", typeof(string)); //数据类型为 文本 _dtSource.Columns.Add("地点", typeof(string)); //数据类型为 文本 for (int i = 0; i < 10; i++) { DataRow drData = _dtSource.NewRow(); drData[0] = "test" + i; drData[1] = "35412549554521263" + i; drData[2] = "2017-05-21 10:55:21"; drData[3] = "北京市"; _dtSource.Rows.Add(drData); } dgInfo.DataSource = _dtSource; InitColumnInfo(); } catch (Exception ex) { } } private void InitColumnInfo() { int index = 0; DataGridViewCheckBoxColumn colCB = new DataGridViewCheckBoxColumn(); DatagridViewCheckBoxHeaderCell cbHeader = new DatagridViewCheckBoxHeaderCell(); colCB.HeaderCell = cbHeader; colCB.HeaderText = "全选"; cbHeader.OnCheckBoxClicked += new CheckBoxClickedHandler(cbHeader_OnCheckBoxClicked); dgInfo.Columns.Insert(index, colCB); index++; dgInfo.Columns[index].HeaderText = "姓名"; dgInfo.Columns[index].Width = 90; index++; dgInfo.Columns[index].HeaderText = "身份证号"; dgInfo.Columns[index].Width = 120; index++; dgInfo.Columns[index].HeaderText = "时间"; dgInfo.Columns[index].Width = 150; index++; dgInfo.Columns[index].HeaderText = "地点"; dgInfo.Columns[index].Width = 100; System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle2 = new System.Windows.Forms.DataGridViewCellStyle(); dataGridViewCellStyle2.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleCenter;//211, 223, 240 dataGridViewCellStyle2.ForeColor = System.Drawing.Color.Blue; dataGridViewCellStyle2.SelectionForeColor = System.Drawing.Color.Blue; dgInfo.Columns[index].DefaultCellStyle = dataGridViewCellStyle2; } }
其他
1. 参考地址:https://www.codeproject.com/Articles/20165/CheckBox-Header-Column-For-DataGridView
2. Demo下载