如何在 DataGridView 的 CheckBoxColumn 中订阅 CheckBox 的事件处理程序，类似于常规 CheckBox 的 CheckChanged 或 Click 事件处理程序？我的应用程序的多个数据网格中有一个或多个列，我想为此执行此操作。
我查看了 CellContentClick 和 CellClick，但它们似乎完全不优雅，因为它们会在数据网格中的每次单击时触发，而不仅仅是针对感兴趣的 Cell 或 CheckBox。
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下面的解决方案来自于 MSDN 文档，以及在这里和 CodeProject 上的一些切线线程中的一点运气。
这个想法是创建一个派生自 DataGridViewCheckBoxCell 的类，其中包括一个与 ContentClick 一起触发的处理程序。这对于一个 DataGridView 来说可能看起来有很多开销，但我的应用程序有很多 DataGridView，所以这段代码是可重用的，从而节省了时间。
/// <summary>
/// DataGridView cell class for check box cells with a OnContentClick event handler.
/// </summary>
public class DataGridViewEventCheckBoxCell : DataGridViewCheckBoxCell
{
/// <summary>
/// Event handler for OnContentClick event.
/// </summary>
protected EventHandler<DataGridViewCellEventArgs> ContentClickEventHandler { get; set; }
/// <summary>
/// Empty constructor. Required. Used by Clone mechanism
/// </summary>
public DataGridViewEventCheckBoxCell()
: base()
{ }
/// <summary>
/// Pass through constructor for threeState parameter.
/// </summary>
/// <param name="threeState">True for three state check boxes, True, False, Indeterminate.</param>
public DataGridViewEventCheckBoxCell(bool threeState)
: base(threeState)
{ }
/// <summary>
/// Constructor to set the OnContentClick event handler.
/// Signature for handler should be (object sender, DataGridViewCellEventArgs e)
/// The sender will be the DataGridViewCell that is clicked.
/// </summary>
/// <param name="handler">Handler for OnContentClick event</param>
/// <param name="threeState">True for three state check boxes, True, False, Indeterminate.</param>
public DataGridViewEventCheckBoxCell(EventHandler<DataGridViewCellEventArgs> handler, bool threeState)
: base(threeState)
{
ContentClickEventHandler = handler;
}
/// <summary>
/// Clone method override. Required so CheckEventHandler property is cloned.
/// Individual DataGridViewCells are cloned from the DataGridViewColumn.CellTemplate
/// </summary>
/// <returns></returns>
public override object Clone()
{
DataGridViewEventCheckBoxCell clone = (DataGridViewEventCheckBoxCell)base.Clone();
clone.ContentClickEventHandler = ContentClickEventHandler;
return clone;
}
/// <summary>
/// Override implementing OnContentClick event propagation
/// </summary>
/// <param name="e">Event arg object, which contains row and column indexes.</param>
protected override void OnContentClick(DataGridViewCellEventArgs e)
{
base.OnContentClick(e);
if (ContentClickEventHandler != null)
ContentClickEventHandler(this, e);
}
/// <summary>
/// Override implementing OnContentDoubleClick event propagation
/// Required so fast clicks are handled properly.
/// </summary>
/// <param name="e">Event arg object, which contains row and column indexes.</param>
protected override void OnContentDoubleClick(DataGridViewCellEventArgs e)
{
base.OnContentDoubleClick(e);
if (ContentClickEventHandler != null)
ContentClickEventHandler(this, e);
}
}
因为我希望能够从列类中引用这个单元格类，所以我还实现了一个派生自 DataGridViewCheckBoxColumn 的类：
/// <summary>
/// DataGridView column class for a check box column with cells that have an OnContentClick handler.
/// </summary>
public class DataGridViewEventCheckBoxColumn : DataGridViewCheckBoxColumn
{
/// <summary>
/// Empty constructor. Pass through to base constructor
/// </summary>
public DataGridViewEventCheckBoxColumn()
: base()
{ }
/// <summary>
/// Pass through to base constructor with threeState parameter
/// </summary>
/// <param name="threeState">True for three state check boxes, True, False, Indeterminate.</param>
public DataGridViewEventCheckBoxColumn(bool threeState)
: base(threeState)
{ }
/// <summary>
/// Constructor for setting the OnContentClick event handler for the cell template.
/// Note that the handler will be called for all clicks, even if the DataGridView is ReadOnly.
/// For the "new" state of the checkbox, use the EditedFormattedValue property of the cell.
/// </summary>
/// <param name="handler">Event handler for OnContentClick.</param>
/// <param name="threeState">True for three state check boxes, True, False, Indeterminate.</param>
public DataGridViewEventCheckBoxColumn(EventHandler<DataGridViewCellEventArgs> handler, bool threeState)
: base(threeState)
{
CellTemplate = new DataGridViewEventCheckBoxCell(handler, threeState);
}
}
修剪掉多余的代码，我像这样使用它：
public void AddCheckBoxColumn(DataGridView grid, EventHandler<DataGridViewCellEventArgs> handler, bool threeState)
{
grid.Columns.Add(new DataGridViewEventCheckBoxColumn(handler, threeState));
}
列类可以去掉，可以按如下方式使用：
public void AddCheckBoxColumn(DataGridView grid, EventHandler<DataGridViewCellEventArgs> handler, bool threeState)
{
DataGridViewCheckBoxColumn column = new DataGridViewCheckBoxColumn(threeState);
column.CellTemplate = new DataGridViewEventCheckBoxCell(handler, threeState);
grid.Columns.Add(column);
}
这是一个示例事件处理程序。数据网格中另一列的状态会根据该列的值和 WasReleased 属性中的某些状态信息进行更新。DataGridView 的 DataSource 是 Specimen 对象的集合，所以每一行的 DataBoundItem 都是一个 Specimen。Specimen 类是特定于应用程序的，但它具有属性 OnHold，由该列显示；IsReleased，由另一列显示；和被释放。
public static void OnHoldCheckClick(object sender, DataGridViewCellEventArgs e)
{
if (sender is DataGridViewEventCheckBoxCell)
{
DataGridViewEventCheckBoxCell cell = sender as DataGridViewEventCheckBoxCell;
if (!cell.ReadOnly)
{
// The rows in the DataGridView are bound to Specimen objects
Specimen specimen = (Specimen)cell.OwningRow.DataBoundItem;
// Modify the underlying data source
if ((bool)cell.EditedFormattedValue)
specimen.IsReleased = false;
else if (specimen.WasReleased)
specimen.IsReleased = true;
// Then invalidate the cell in the other column to force it to redraw
DataGridViewCell releasedCell = cell.OwningRow.Cells["IsReleased"];
cell.DataGridView.InvalidateCell(releasedCell);
}
}
}
好的样式可能会将事件处理程序中的一些代码下推到 Specimen 类中的方法中。
于 2012-11-14T19:39:01.353 回答
1
您可以使用
e.Item.Cells[1].Text
这里 e 是当前行和第二个单元格记住单元格索引总是从 0 索引开始
于 2012-11-13T01:32:42.777 回答