DataGridView.SelectedColumns Properti

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Sumber:

DataGridView.cs

Mendapatkan kumpulan kolom yang dipilih oleh pengguna.

public:
 property System::Windows::Forms::DataGridViewSelectedColumnCollection ^ SelectedColumns { System::Windows::Forms::DataGridViewSelectedColumnCollection ^ get(); };

[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.DataGridViewSelectedColumnCollection SelectedColumns { get; }

[<System.ComponentModel.Browsable(false)>]
member this.SelectedColumns : System.Windows.Forms.DataGridViewSelectedColumnCollection

Public ReadOnly Property SelectedColumns As DataGridViewSelectedColumnCollection

Nilai Properti

DataGridViewSelectedColumnCollection

DataGridViewSelectedColumnCollection yang mewakili kolom yang dipilih oleh pengguna.

Atribut

BrowsableAttribute

Contoh

Contoh kode berikut menunjukkan cara menggunakan SelectedColumns properti untuk mendapatkan kolom yang dipilih dalam pengurutan terprogram. Dalam contoh ini, properti ini digunakan dalam Sort metode untuk menentukan arah pengurutan.

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

Keterangan

Properti SelectionMode harus diatur ke DataGridViewSelectionMode.FullColumnSelect atau DataGridViewSelectionMode.ColumnHeaderSelect agar SelectedColumns properti diisi dengan kolom yang dipilih.

Properti ini berisi rekam jepret baca-saja dari pilihan pada saat dirujuk. Jika Anda menyimpan salinan koleksi ini, mungkin berbeda dari status aktual berikutnya DataGridView di mana pengguna mungkin telah mengubah pilihan. Oleh karena itu, Anda tidak boleh beroperasi pada salinan koleksi.

Lihat juga

• Kontrol DataGridView (Formulir Windows)