Question

有没有办法让DataGridView没有选择单元格？我注意到即使失去焦点（）它至少有一个活跃的细胞。还有其他模式允许这个吗？或其他一些技巧？

Answer 1

DataGridView.CurrentCell属性可用于清除焦点矩形。

您可以设置此属性（DataGridView.CurrentCell）为null 暂时删除焦点矩形，但当控制获得焦点和价值 property为null，它是自动的设置为的值 FirstDisplayedCell属性。

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

Answer 2

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;
    }

它需要位于DataBindingComplete事件处理程序中。

你附加SelectionChanged事件处理程序的地方不会影响所需的行为，但我把它留在代码片段中因为我注意到我的需要，至少最好只在数据绑定后附加处理程序，这样我避免为每个绑定的项目引发选择更改事件。

Answer 3

在选择更改事件上将DataGridView.CurrentCell设置为null的问题是以后的事件（如点击）不会被命中。

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;

Answer 4

我花了几个小时找到解决这个问题的方法。这样做：

创建表单项目
添加名为“DataGridView1”

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

importaint代码行是

    DataGridView1.CurrentRow.Selected = False

Answer 5

我有类似的问题，我按照这种方式：

'初始活动单元格'由dataGridView.ClearSelection（）清除。

清除/忽略事件处理程序中的选择，'CellMouseClick'事件。

void dataGridView_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)

{

    DataGridView dgv = sender as DataGridView;

    dgv.ClearSelection();

}

Answer 6

我知道这是一个老问题，WinForms已被取代（但不过很长一段时间仍然在我们的商店中），所以这仍然与我们相关，我也怀疑其他一些。

我没有摆弄选择或CurrentCell，而是发现实现只是简单地改变行选择颜色，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，也不必在没有焦点时刷新网格时处理棘手的问题（如计时器）并且旧选择的单元格不能＆＃ 34;恢复＆＃34;何时返回焦点。

除了上面已经发布的解决方案，我们无法（不想）继承DataGridView控件，而是选择使用合成。下面的代码显示了用于实现该功能的类，然后是关于如何使用它来代替＆＃34; attach＆＃34;对DataGridView的行为。

/// <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 );
    }
}

<强>用法：要使用实例化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()来简化生活。

myDataGrid.AttachHideSelectionBehaviour();

也许这对其他人有帮助。

Answer 7

在您想要清除焦点/选择时使用DataGridView.ClearSelection()（例如，InitializeComponent，Control.LostFocus，Form.Load）。

WinForms - DataGridView - 未选择单元格

7 个答案: