DataGridView.SelectedColumns 属性

定义

获取用户选定的列的集合。Gets the collection of columns selected by the user.

public:
 property System::Windows::Forms::DataGridViewSelectedColumnCollection ^ SelectedColumns { System::Windows::Forms::DataGridViewSelectedColumnCollection ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.DataGridViewSelectedColumnCollection SelectedColumns { get; }
member this.SelectedColumns : System.Windows.Forms.DataGridViewSelectedColumnCollection
Public ReadOnly Property SelectedColumns As DataGridViewSelectedColumnCollection

属性值

一个 DataGridViewSelectedColumnCollection,表示用户选定的列。A DataGridViewSelectedColumnCollection that represents the columns selected by the user.

属性

示例

下面的代码示例演示如何使用 SelectedColumns 属性在编程排序中获取所选列。The following code example demonstrates how to use the SelectedColumns property to get the selected column in a programmatic sort. 在此示例中,在 Sort 方法中使用此属性来确定排序的方向。In this example, this property is used in the Sort method to determine the direction of the sort.

private void sortButton_Click(object sender, System.EventArgs e)
{
    // Check which column is selected, otherwise set NewColumn to null.
    DataGridViewColumn newColumn =
        dataGridView1.Columns.GetColumnCount(
        DataGridViewElementStates.Selected) == 1 ?
        dataGridView1.SelectedColumns[0] : null;

    DataGridViewColumn oldColumn = dataGridView1.SortedColumn;
    ListSortDirection direction;

    // If oldColumn is null, then the DataGridView is not currently sorted.
    if (oldColumn != null)
    {
        // Sort the same column again, reversing the SortOrder.
        if (oldColumn == newColumn &&
            dataGridView1.SortOrder == SortOrder.Ascending)
        {
            direction = ListSortDirection.Descending;
        }
        else
        {
            // Sort a new column and remove the old SortGlyph.
            direction = ListSortDirection.Ascending;
            oldColumn.HeaderCell.SortGlyphDirection = SortOrder.None;
        }
    }
    else
    {
        direction = ListSortDirection.Ascending;
    }

    // If no column has been selected, display an error dialog  box.
    if (newColumn == null)
    {
        MessageBox.Show("Select a single column and try again.",
            "Error: Invalid Selection", MessageBoxButtons.OK,
            MessageBoxIcon.Error);
    }
    else
    {
        dataGridView1.Sort(newColumn, direction);
        newColumn.HeaderCell.SortGlyphDirection =
            direction == ListSortDirection.Ascending ?
            SortOrder.Ascending : SortOrder.Descending;
    }
}
Private Sub SortButton_Click(ByVal sender As Object, _
    ByVal e As EventArgs) Handles sortButton.Click

    ' Check which column is selected, otherwise set NewColumn to Nothing.
    Dim newColumn As DataGridViewColumn
    If dataGridView1.Columns.GetColumnCount(DataGridViewElementStates _
        .Selected) = 1 Then
        newColumn = dataGridView1.SelectedColumns(0)
    Else
        newColumn = Nothing
    End If

    Dim oldColumn As DataGridViewColumn = dataGridView1.SortedColumn
    Dim direction As ListSortDirection

    ' If oldColumn is null, then the DataGridView is not currently sorted.
    If oldColumn IsNot Nothing Then

        ' Sort the same column again, reversing the SortOrder.
        If oldColumn Is newColumn AndAlso dataGridView1.SortOrder = _
            SortOrder.Ascending Then
            direction = ListSortDirection.Descending
        Else

            ' Sort a new column and remove the old SortGlyph.
            direction = ListSortDirection.Ascending
            oldColumn.HeaderCell.SortGlyphDirection = SortOrder.None
        End If
    Else
        direction = ListSortDirection.Ascending
    End If


    ' If no column has been selected, display an error dialog  box.
    If newColumn Is Nothing Then
        MessageBox.Show("Select a single column and try again.", _
            "Error: Invalid Selection", MessageBoxButtons.OK, _
            MessageBoxIcon.Error)
    Else
        dataGridView1.Sort(newColumn, direction)
        If direction = ListSortDirection.Ascending Then
            newColumn.HeaderCell.SortGlyphDirection = SortOrder.Ascending
        Else
            newColumn.HeaderCell.SortGlyphDirection = SortOrder.Descending
        End If
    End If

End Sub

注解

若要用选定的列填充 SelectionMode 属性,必须将该属性设置为 DataGridViewSelectionMode.FullColumnSelect 或 @no__t-@no__t 2。The SelectionMode property must be set to DataGridViewSelectionMode.FullColumnSelect or DataGridViewSelectionMode.ColumnHeaderSelect for the SelectedColumns property to be populated with selected columns.

此属性包含所选内容在引用时的只读快照。This property contains a read-only snapshot of the selection at the time it is referenced. 如果你保存在此集合的副本上,则它可能与实际的 @no__t 0 状态不同,用户可能已更改了所选内容。If you hold onto a copy of this collection, it may differ from the actual, subsequent DataGridView state in which the user may have changed the selection. 因此,不应在集合的副本上进行操作。Therefore, you should not operate on a copy of the collection.

适用于

另请参阅