DataGridViewCell.ValueType Proprietà

Definizione

Ottiene o imposta il tipo di dati dei valori della cella.Gets or sets the data type of the values in the cell.

public:
 virtual property Type ^ ValueType { Type ^ get(); void set(Type ^ value); };
[System.ComponentModel.Browsable(false)]
public virtual Type ValueType { get; set; }
[<System.ComponentModel.Browsable(false)>]
member this.ValueType : Type with get, set
Public Overridable Property ValueType As Type

Valore della proprietà

Type

Type che rappresenta il tipo di dati del valore della cella.A Type representing the data type of the value in the cell.

Attributi

Esempio

Nell'esempio di codice riportato di seguito viene illustrato l'utilizzo di questa proprietà.The following code example demonstrates the use of this property.

private DataGridView dataGridView1 = new DataGridView();

private void AddColorColumn()
{
    DataGridViewComboBoxColumn comboBoxColumn =
        new DataGridViewComboBoxColumn();
    comboBoxColumn.Items.AddRange(
        Color.Red, Color.Yellow, Color.Green, Color.Blue);
    comboBoxColumn.ValueType = typeof(Color);
    dataGridView1.Columns.Add(comboBoxColumn);
    dataGridView1.EditingControlShowing +=
        new DataGridViewEditingControlShowingEventHandler(
        dataGridView1_EditingControlShowing);
}

private void dataGridView1_EditingControlShowing(object sender,
    DataGridViewEditingControlShowingEventArgs e)
{
    ComboBox combo = e.Control as ComboBox;
    if (combo != null)
    {
        // Remove an existing event-handler, if present, to avoid 
        // adding multiple handlers when the editing control is reused.
        combo.SelectedIndexChanged -=
            new EventHandler(ComboBox_SelectedIndexChanged);

        // Add the event handler. 
        combo.SelectedIndexChanged +=
            new EventHandler(ComboBox_SelectedIndexChanged);
    }
}

private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
    ((ComboBox)sender).BackColor = (Color)((ComboBox)sender).SelectedItem;
}
Private WithEvents dataGridView1 As New DataGridView()

Private Sub AddColorColumn()

    Dim comboBoxColumn As New DataGridViewComboBoxColumn()
    comboBoxColumn.Items.AddRange( _
        Color.Red, Color.Yellow, Color.Green, Color.Blue)
    comboBoxColumn.ValueType = GetType(Color)
    dataGridView1.Columns.Add(comboBoxColumn)

End Sub

Private Sub dataGridView1_EditingControlShowing(ByVal sender As Object, _
    ByVal e As DataGridViewEditingControlShowingEventArgs) _
    Handles dataGridView1.EditingControlShowing

    Dim combo As ComboBox = CType(e.Control, ComboBox)
    If (combo IsNot Nothing) Then

        ' Remove an existing event-handler, if present, to avoid 
        ' adding multiple handlers when the editing control is reused.
        RemoveHandler combo.SelectedIndexChanged, _
            New EventHandler(AddressOf ComboBox_SelectedIndexChanged)

        ' Add the event handler. 
        AddHandler combo.SelectedIndexChanged, _
            New EventHandler(AddressOf ComboBox_SelectedIndexChanged)

    End If

End Sub

Private Sub ComboBox_SelectedIndexChanged( _
    ByVal sender As Object, ByVal e As EventArgs)

    Dim comboBox1 As ComboBox = CType(sender, ComboBox)
    comboBox1.BackColor = _
        CType(CType(sender, ComboBox).SelectedItem, Color)

End Sub

Commenti

Se la ValueType proprietà per la cella non è stata impostata, DataGridViewColumn.ValueType viene utilizzata la proprietà per la colonna di appartenenza, se esistente.If the ValueType property for the cell has not been set, the DataGridViewColumn.ValueType property for the owning column is used, if it exists.

La Value proprietà è l'oggetto dati effettivo contenuto nella cella, mentre la FormattedValue proprietà è la rappresentazione formattata dei dati.The Value property is the actual data object contained by the cell, whereas the FormattedValue property is the formatted representation of the data. Le ValueType FormattedValueType proprietà e corrispondono rispettivamente ai tipi di dati di questi valori.The ValueType and FormattedValueType properties correspond to the data types of these values, respectively.

Si applica a

Vedi anche