12

有没有办法让 DataGridView 没有选择单元格？我注意到即使它失去了 focus() 它也至少有一个活动单元格。是否有另一种模式允许这样做？或其他一些技巧？

4

7 回答 7

12

DataGridView.CurrentCell 属性可用于清除焦点矩形。

可以将此属性（DataGridView.CurrentCell）设置为null来临时移除焦点矩形，但是当控件接收到焦点并且该属性的值为null时，它会自动设置为FirstDisplayedCell属性的值。

http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.currentcell.aspx

于 2008-12-04T15:44:19.553 回答
7

我发现DataGridView.CurrentCell = null在尝试获取请求的行为时对我不起作用。

我最终使用的是：

    private void dgvMyGrid_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
    {
        if (dgvMyGrid.SelectedRows.Count > 0)
        {
            dgvMyGrid.SelectedRows[0].Selected = false;
        }

        dgvMyGrid.SelectionChanged += dgvMyGrid_SelectionChanged;
    }

它需要在DataBindingComplete事件处理程序中。

附加SelectionChanged事件处理程序的位置不会影响所需的行为，但我将其留在代码片段中，因为我注意到至少出于我的需要，最好仅在数据绑定之后附加处理程序，这样我就可以避免引发选择更改事件对于每个绑定的项目。

于 2008-12-19T05:18:21.290 回答
7

在选择更改事件上将 DataGridView.CurrentCell 设置为 null 的问题是不会命中以后的事件（如单击）。

对我有用的选项是将选择颜色更改为网格颜色。因此选择将不可见。

RowsDefaultCellStyle.SelectionBackColor = BackgroundColor;
RowsDefaultCellStyle.SelectionForeColor = ForeColor;
于 2012-01-27T21:40:55.777 回答
4

我花了几个小时来找到这个问题的解决方案。做这个：

  1. 创建表单项目
  2. 添加一个名为“DataGridView1”的 DataGridView

  3. 将以下代码添加到您的类 Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim dgvRow(17) As DataGridViewRow
Dim i As Integer
For i = 0 To dgvRow.Length - 1
    dgvRow(i) = New DataGridViewRow()
    dgvRow(i).Height = 16
    dgvRow(i).Selected = False
    dgvRow(i).ReadOnly = True
    DataGridView1.Rows.Add(dgvRow(i))
    DataGridView1.CurrentRow.Selected = False
Next
End Sub

重要的代码行是

    DataGridView1.CurrentRow.Selected = False

祝你好运！

于 2009-01-10T18:50:48.400 回答
3

我有类似的问题，我按照这种方式：

  1. 由 dataGridView.ClearSelection() 清除的“初始活动单元格”。

  2. 清除/忽略事件处理程序“CellMouseClick”事件中的选择。

    void dataGridView_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)

{

    DataGridView dgv = sender as DataGridView;

    dgv.ClearSelection();

}
于 2012-12-27T05:56:58.967 回答
1

我知道这是一个老问题，WinForms 已被取代（但在我们的商店里仍然没有很长时间），所以这仍然与我们相关，我也怀疑其他一些问题。

而不是摆弄选择 or CurrentCell，我发现实现简单地更改行选择颜色更适合我们的需要。

此外，我不再需要在失去焦点时跟踪旧的选定单元格，也不必处理在没有焦点时刷新网格（如通过计时器）并且在焦点时无法“恢复”旧选定单元格时的棘手问题被退回。

除了上面已经发布的解决方案之外，我们不能（不想）从DataGridView控件继承，而是选择使用组合。下面的代码显示了用于实现该功能的类，然后是有关如何使用它将行为“附加”到 DataGridView 的代码。

/// <summary>
/// Responsible for hiding the selection of a DataGridView row when the control loses focus.
/// </summary>
public class DataGridViewHideSelection : IDisposable
{
    private readonly DataGridView _dataGridView;

    private Color _alternatingRowSelectionBackColor = Color.Empty;
    private Color _alternatingRowSelectionForeColor = Color.Empty;
    private Color _rowSelectionBackColor = Color.Empty;
    private Color _rowSelectionForeColor = Color.Empty;

    /// <summary>
    /// Initializes a new instance of the <see cref="DataGridViewHideSelection"/> class.
    /// </summary>
    /// <param name="dataGridView">The data grid view.</param>
    public DataGridViewHideSelection( DataGridView dataGridView )
    {
        if ( dataGridView == null )
            throw new ArgumentNullException( "dataGridView" );

        _dataGridView = dataGridView;
        _dataGridView.Enter += DataGridView_Enter;
        _dataGridView.Leave += DataGridView_Leave;
    }

    /// <summary>
    /// Handles the Enter event of the DataGridView control.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
    private void DataGridView_Enter( object sender, EventArgs e )
    {
        // Restore original colour
        if ( _rowSelectionBackColor != Color.Empty )
            _dataGridView.RowsDefaultCellStyle.SelectionBackColor = _rowSelectionBackColor;

        if ( _rowSelectionForeColor != Color.Empty )
            _dataGridView.RowsDefaultCellStyle.SelectionForeColor = _rowSelectionForeColor;

        if ( _alternatingRowSelectionBackColor != Color.Empty )
            _dataGridView.AlternatingRowsDefaultCellStyle.SelectionBackColor = _alternatingRowSelectionBackColor;

        if ( _alternatingRowSelectionForeColor != Color.Empty )
            _dataGridView.AlternatingRowsDefaultCellStyle.SelectionForeColor = _alternatingRowSelectionForeColor;
    }

    /// <summary>
    /// Handles the Leave event of the DataGridView control.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
    private void DataGridView_Leave( object sender, EventArgs e )
    {
        // Backup original colour
        _rowSelectionBackColor = _dataGridView.RowsDefaultCellStyle.SelectionBackColor;
        _rowSelectionForeColor = _dataGridView.RowsDefaultCellStyle.SelectionForeColor;
        _alternatingRowSelectionBackColor = _dataGridView.RowsDefaultCellStyle.SelectionBackColor;
        _alternatingRowSelectionForeColor = _dataGridView.RowsDefaultCellStyle.SelectionForeColor;

        // Change to "blend" in
        _dataGridView.RowsDefaultCellStyle.SelectionBackColor = _dataGridView.RowsDefaultCellStyle.BackColor;
        _dataGridView.RowsDefaultCellStyle.SelectionForeColor = _dataGridView.RowsDefaultCellStyle.ForeColor;
        _dataGridView.AlternatingRowsDefaultCellStyle.SelectionBackColor = _dataGridView.AlternatingRowsDefaultCellStyle.BackColor;
        _dataGridView.AlternatingRowsDefaultCellStyle.SelectionForeColor = _dataGridView.AlternatingRowsDefaultCellStyle.ForeColor;
    }

    #region IDisposable implementation (for root base class)

    private bool _disposed;

    /// <summary>
    /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
    /// </summary>
    /// <remarks>
    /// Called by consumers.
    /// </remarks>
    public void Dispose()
    {
        Dispose( true );
        GC.SuppressFinalize( this );
    }

    /// <summary>
    /// Disposes this instance, with an indication whether it is called from managed code or the GC's finalization of this instance.
    /// </summary>
    /// <remarks>
    /// Overridden by inheritors.
    /// </remarks>
    /// <param name="disposingFromManagedCode">if set to <c>true</c> disposing from managed code.</param>
    protected virtual void Dispose( Boolean disposingFromManagedCode )
    {
        if ( _disposed )
            return;

        // Clean up managed resources here
        if ( disposingFromManagedCode )
        {
            if ( _dataGridView != null )
            {
                _dataGridView.Enter -= DataGridView_Enter;
                _dataGridView.Leave -= DataGridView_Leave;
            }
        }

        // Clean up any unmanaged resources here

        // Signal disposal has been done.
        _disposed = true;
    }

    /// <summary>
    /// Finalize an instance of the <see cref="DataGridViewHideSelection"/> class.
    /// </summary>
    ~DataGridViewHideSelection()
    {
        Dispose( false );
    }

    #endregion
}


/// <summary>
/// Extends data grid view capabilities with additional extension methods.
/// </summary>
public static class DataGridViewExtensions
{
    /// <summary>
    /// Attaches the hide selection behaviour to the specified DataGridView instance.
    /// </summary>
    /// <param name="dataGridView">The data grid view.</param>
    /// <returns></returns>
    /// <exception cref="System.ArgumentNullException">dataGridView</exception>
    public static DataGridViewHideSelection AttachHideSelectionBehaviour( this DataGridView dataGridView )
    {
        if ( dataGridView == null )
            throw new ArgumentNullException( "dataGridView" );

        return new DataGridViewHideSelection( dataGridView );
    }
}

用法： 使用实例化 DataGridViewHideSelection 类的实例并在不再需要功能时将其丢弃。

var hideSelection = new DataGridViewHideSelection( myGridView );

// ...

/// When no longer needed
hideSelection.Dispose();

或者，您可以使用方便的扩展方法AttachHideSelectionBehaviour()让生活更轻松。

myDataGrid.AttachHideSelectionBehaviour();

也许这对其他人有帮助。

于 2014-11-15T03:16:57.987 回答
1

使用DataGridView.ClearSelection()来清除焦点/选择（例如 InitializeComponent、Control.LostFocus和Form.Load）。

于 2016-04-21T10:36:55.923 回答