logo标签列表

WinForms - DataGridView - 无选定单元格

.netwinformsdatagridview
13
有没有办法使DataGridView没有选定的单元格？我注意到即使失去了焦点，它仍然至少有一个活动单元格。有其他模式允许这样吗？还是有其他的技巧可以做到这一点？
7个回答
12
7

在选择更改事件中将DataGridView.CurrentCell设置为null的问题是，稍后的事件（如点击）将不会被触发。

对我有效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;
你的解决方案不会使DataGridView没有选中单元格，这只是外观问题... - nbadaud
7

我发现当我试图获取所需的行为时，DataGridView.CurrentCell = null对我没有作用。

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，但我在代码片段中保留了它，因为我注意到至少对于我的需求，仅在数据绑定后附加处理程序更好，这样可以避免为每个绑定的项引发选择更改事件。

4
我花了好几个小时才找到这个问题的解决方案。请按照以下步骤操作：
  1. Create a Form Project
  2. Add a DataGridView with the name "DataGridView1"

  3. Add the following code to your class 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！

3

我也遇到过类似的问题，我是按照以下方式解决的：

  1. 'Initial active cell' cleared by dataGridView.ClearSelection().

  2. Clear/Ignore the selection in the event handler, 'CellMouseClick' Event. 

    void dataGridView_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)

{

    DataGridView dgv = sender as DataGridView;

    dgv.ClearSelection();

}
1
1

我知道这是一个老问题，WinForms已经被取代了（但在我们的商店里仍然使用），所以这对我们仍然很重要，我认为其他人也会这样。

与其摆弄选择或CurrentCell，我发现实现简单地改变行选择颜色更适合我们的需求。

此外，当失去焦点时，我不再需要跟踪旧的选定单元格，也不必处理当网格在没有焦点时刷新（例如通过计时器）并且无法在焦点返回时“恢复”旧的选定单元格的棘手问题。

除了上面已经发布的解决方案之外，我们不能（也不想）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功能的类，后面是如何将其“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: 要使用DataGridViewHideSelection类的实例化，请在不再需要功能时将其处理掉。

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()来使生活变得更加轻松。

myDataGrid.AttachHideSelectionBehaviour();

也许对其他人有帮助。
网页内容由stack overflow 提供, 点击上面的
可以查看英文原文，
原文链接