DataGridView.ColumnHeaderMouseClick イベント

定義

列ヘッダーがクリックされたときに発生します。Occurs when the user clicks a column header.

public:
 event System::Windows::Forms::DataGridViewCellMouseEventHandler ^ ColumnHeaderMouseClick;
public event System.Windows.Forms.DataGridViewCellMouseEventHandler ColumnHeaderMouseClick;
member this.ColumnHeaderMouseClick : System.Windows.Forms.DataGridViewCellMouseEventHandler 
Public Custom Event ColumnHeaderMouseClick As DataGridViewCellMouseEventHandler 

@No__t 0 で列見出しをクリックすると、既定の動作では、クリックされた列に基づいてグリッドの行が並べ替えられます。または、クリックした列でグリッドが既に並べ替えられている場合は、並べ替え順序が逆になります。When a column heading is clicked in a DataGridView, the default behavior is to order the grid rows based on the clicked column, or to reverse the sort order if the grid is already sorted by the clicked column. このイベントを使用して、既定の動作が無効になっている場合に @no__t をクリックしたときの既定の動作をエミュレートするプログラムによる並べ替えを実行する方法を次のコード例に示します。The following code example demonstrates how to use this event to perform a programmatic sort that emulates the default behavior of clicking a DataGridViewColumnHeaderCell when the default behavior has been disabled. この例では、SelectionModeColumnHeaderSelect に設定されているため、@no__t をクリックすると列の内容が選択されます。In this example, the SelectionMode is set to ColumnHeaderSelect, so clicking the DataGridViewColumnHeaderCell selects the contents of the column. コード例を意図したとおりに機能させるには、データが DataGridView に読み込まれるたびに、既定の列ヘッダーのクリック動作を変更する必要があります。For the example code to function as intended, the default column header click behavior needs to be changed each time the data is loaded into the DataGridView. @No__t-0 イベントハンドラーを追加して、既定の動作を変更するコードを提供します。Add a DataBindingComplete event handler to provide the code that changes the default behavior. この例を実行するには、dataGridView1 という名前の @no__t 0 を含むフォームにコードを貼り付け、すべてのイベントがイベントハンドラーに関連付けられていることを確認します。To run this example, paste the code into a form that contains a DataGridView named dataGridView1 and ensure that all events are associated with their event handlers.

private void dataGridView1_ColumnHeaderMouseClick(
    object sender, DataGridViewCellMouseEventArgs e)
{
    DataGridViewColumn newColumn = dataGridView1.Columns[e.ColumnIndex];
    DataGridViewColumn oldColumn = dataGridView1.SortedColumn;
    ListSortDirection direction;

    // If oldColumn is null, then the DataGridView is not 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;
    }

    // Sort the selected column.
    dataGridView1.Sort(newColumn, direction);
    newColumn.HeaderCell.SortGlyphDirection =
        direction == ListSortDirection.Ascending ?
        SortOrder.Ascending : SortOrder.Descending;
}

private void dataGridView1_DataBindingComplete(object sender,
    DataGridViewBindingCompleteEventArgs e)
{
    // Put each of the columns into programmatic sort mode.
    foreach (DataGridViewColumn column in dataGridView1.Columns)
    {
        column.SortMode = DataGridViewColumnSortMode.Programmatic;
    }
}
Private Sub dataGridView1_ColumnHeaderMouseClick(ByVal sender As Object, _
    ByVal e As DataGridViewCellMouseEventArgs) _
    Handles dataGridView1.ColumnHeaderMouseClick

    Dim newColumn As DataGridViewColumn = _
        dataGridView1.Columns(e.ColumnIndex)
    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

    ' Sort the selected column.
    dataGridView1.Sort(newColumn, direction)
    If direction = ListSortDirection.Ascending Then
        newColumn.HeaderCell.SortGlyphDirection = SortOrder.Ascending
    Else
        newColumn.HeaderCell.SortGlyphDirection = SortOrder.Descending
    End If

End Sub

Private Sub dataGridView1_DataBindingComplete(ByVal sender As Object, _
    ByVal e As DataGridViewBindingCompleteEventArgs) _
    Handles dataGridView1.DataBindingComplete

    ' Put each of the columns into programmatic sort mode.
    For Each column As DataGridViewColumn In dataGridView1.Columns
        column.SortMode = DataGridViewColumnSortMode.Programmatic
    Next
End Sub

注釈

イベントを処理する方法の詳細については、次を参照してください。処理とイベントの発生します。For more information about how to handle events, see Handling and Raising Events.

適用対象

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