实现效果

点击checkBox1或者直接在第一列列表头点击即可实现
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代码实现

我的datagridview叫dgv
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我在datagridview已经默认添加了一个DataGridViewCheckBoxColumn，勾选时value为1，不勾选时value为0

第一种通过可视化拖动一个checkBox来实现

拖动组件，然后绑定事件
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点击事件

事件代码：

		/// <summary>/// checkbox1的点击事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void checkSelectAll_CheckedChanged(object sender, EventArgs e){if (checkSelectAll.Checked){foreach (DataGridViewRow dgvRow in this.dgv.Rows){dgvRow.Cells["dataGridViewCheckBoxColumn1"].Value = true;}}else{foreach (DataGridViewRow dgvRow in this.dgv.Rows){dgvRow.Cells["dataGridViewCheckBoxColumn1"].Value = false;}}}

第二种，自定义checkBox，添加到列头

这种需要自己弄一个DataGridViewCheckBoxColumn
文件位置
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详细代码：
==DatagridviewCheckboxHeaderCell ==

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using WindowsFormsApp20230728.Properties;namespace WindowsFormsApp20230728
{//定义触发单击事件的委托public delegate void DatagridviewcheckboxHeaderEventHander(object sender, DatagridviewCheckboxHeaderEventArgs e);//定义继承于DataGridViewColumnHeaderCell的类，用于绘制checkbox，定义checkbox鼠标单击事件public 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 DatagridviewcheckboxHeaderEventHander OnCheckBoxClicked;//绘制列头checkboxprotected 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) - 1;//列头checkbox的X坐标p.Y = cellBounds.Location.Y +(cellBounds.Height / 2) - (s.Height / 2);//列头checkbox的Y坐标_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);}/// <summary>/// 点击列头checkbox单击事件/// </summary>protected override void OnMouseClick(DataGridViewCellMouseEventArgs e){var 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;//获取列头checkbox的选择状态DatagridviewCheckboxHeaderEventArgs ex = new DatagridviewCheckboxHeaderEventArgs { CheckedState = _checked };var sender = new object();//此处不代表选择的列头checkbox，只是作为参数传递。应该列头checkbox是绘制出来的，无法获得它的实例if (OnCheckBoxClicked != null){OnCheckBoxClicked(sender, ex);//触发单击事件this.DataGridView.InvalidateCell(this);}}base.OnMouseClick(e);}}
}

==DatagridviewCheckboxHeaderEventArgs ==

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;namespace WindowsFormsApp20230728
{//定义包含列头checkbox选择状态的参数类public class DatagridviewCheckboxHeaderEventArgs : EventArgs{public DatagridviewCheckboxHeaderEventArgs(){CheckedState = false;}public bool CheckedState{get { return _CheckedState; }set { _CheckedState = value; }}private bool _CheckedState;}
}

实现位置，均在Form2类中
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代码：

		public Form2(){InitializeComponent();//InitColumnInfo();#region  自定义组件开始//自定义组件实现var ch = new DatagridviewCheckboxHeaderCell();ch.OnCheckBoxClicked += new DatagridviewcheckboxHeaderEventHander(ch_OnCheckBoxClicked);var checkboxCol = this.dgv.Columns[0] as DataGridViewCheckBoxColumn;checkboxCol.HeaderCell = ch;checkboxCol.HeaderCell.Value = string.Empty;}

注意其中dgv.EndEdit(); 失去焦点操作，如果没有这个，你焦点所在checkBox不会勾选

		//去除datagridview列表头排序//    foreach (DataGridViewColumn item in dgv.Columns)//        item.SortMode = DataGridViewColumnSortMode.NotSortable;/// <summary>/// 单击事件/// </summary>private void ch_OnCheckBoxClicked(object sender, DatagridviewCheckboxHeaderEventArgs e){//失去焦点操作dgv.EndEdit();//Console.WriteLine(e.CheckedState.ToString());//选中事件操作if (e.CheckedState){for(int i = 0; i < dgv.Rows.Count; i++){dgv.Rows[i].Cells[0].Value = 1;}//foreach (DataGridViewRow dgvRow in this.dgv.Rows)//{//    dgvRow.Cells["dataGridViewCheckBoxColumn1"].Value = true;//}}else{for (int i = 0; i < dgv.Rows.Count; i++){dgv.Rows[i].Cells[0].Value = 0;}//foreach (DataGridViewRow dgvRow in this.dgv.Rows)//{//    dgvRow.Cells["dataGridViewCheckBoxColumn1"].Value = 0;//}}}

第三种，不添加DataGridViewCheckBoxColumn，直接以自定义的形式形成一列的checkBox

和第二种相比，就是把DataGridViewCheckBoxColumn从DataGridView中删除，然后public Form2()自定义组件实现代码改一下，其他都是一样的

也就是把这一串换成下面的即可

//自定义组件实现
var ch = new DatagridviewCheckboxHeaderCell();
ch.OnCheckBoxClicked += new DatagridviewcheckboxHeaderEventHander(ch_OnCheckBoxClicked);
var checkboxCol = this.dgv.Columns[0] as DataGridViewCheckBoxColumn;
checkboxCol.HeaderCell = ch;
checkboxCol.HeaderCell.Value = string.Empty;

if (!this.DesignMode){DatagridviewCheckboxHeaderCell cbHeader = new DatagridviewCheckboxHeaderCell();cbHeader.OnCheckBoxClicked += new DatagridviewcheckboxHeaderEventHander(ch_OnCheckBoxClicked);DataGridViewCheckBoxColumn checkboxCol = new DataGridViewCheckBoxColumn();checkboxCol.HeaderCell = cbHeader;checkboxCol.HeaderCell.Value = string.Empty;this.dgv.Columns.Insert(0,checkboxCol);
}

第三种实现的是类属于java面向对象编程的效果，第二种则是自定义组件进行添加的效果

参考文章

C# Winform中DataGridView的DataGridViewCheckBoxColumn CheckBox选中判断
关于Winform中DatagridView 表头checkBox全选选项框总结
DataGridView EndEdit()方法
c# winform获取gridview数据