带CheckBox列头的DataGridView

迷南。 2022-01-11 20:39 197阅读 0赞

在项目的开发中，在DataGridView中将CheckBox作为第一列使用的很平常，使用微软自带DataGridView中的DataGridViewCheckBoxCell，但是微软自带的DataGridView中又没有能够将CheckBox作为列头来做全选和全取消选择的功能。所以如果想实现在列头上显示一个CheckBox并且点击CheckBox来实现全选和全取消，就没有现成的。但是办法是人想出来的，既然微软没有能够提供现成的实现方法，那我们就要自己动手，才能丰衣足食了。其实这个功能实现起来也不是很难，我们首先要定义一个DatagridViewCheckBoxHeaderCell类，它是继承自DataGridViewColumnHeaderCell，主要是要重写里面的OnPaint方法和OnMouseClick方法即可，代码如下：

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);  
        \}

除此之外，还需要加上事件处理的委托，代码如下：

public delegate void CheckBoxClickedHandler(bool state);  
    public class DataGridViewCheckBoxHeaderCellEventArgs : EventArgs  
    \{  
        bool \_bChecked;  
        public DataGridViewCheckBoxHeaderCellEventArgs(bool bChecked)  
        \{  
            \_bChecked = bChecked;  
        \}  
        public bool Checked  
        \{  
            get \{ return \_bChecked; \}  
        \}  
    \}

然后在客户端加上如下代码：

DataGridViewCheckBoxColumn colCB = new DataGridViewCheckBoxColumn();DatagridViewCheckBoxHeaderCell cbHeader = new DatagridViewCheckBoxHeaderCell();colCB.HeaderCell = cbHeader;datagridview1.Columns.Add(colCB);

再在客户端完成事件处理：

cbHeader.OnCheckBoxClicked +=     new CheckBoxClickedHandler(cbHeader\_OnCheckBoxClicked);

主要的代码实现就这么多呢。

为了方便大家的使用，我做了一个Demo来演示具体怎么使用，可以到我的资源中去下载：[http://download.csdn.net/detail/weizhiai12/4445491][http_download.csdn.net_detail_weizhiai12_4445491]。

原文的作者没有提供例子。

想查看原文的可以点击如下地址查看：

[http://www.codeproject.com/Articles/20165/CheckBox-Header-Column-For-DataGridView][http_www.codeproject.com_Articles_20165_CheckBox-Header-Column-For-DataGridView]

转载于:https://www.cnblogs.com/kevinGao/archive/2012/07/23/2605583.html

[http_download.csdn.net_detail_weizhiai12_4445491]: http://download.csdn.net/detail/weizhiai12/4445491
[http_www.codeproject.com_Articles_20165_CheckBox-Header-Column-For-DataGridView]: http://www.codeproject.com/Articles/20165/CheckBox-Header-Column-For-DataGridView