DataGridViewCell.DefaultNewRowValue Egenskap

public:
 virtual property System::Object ^ DefaultNewRowValue { System::Object ^ get(); };

[System.ComponentModel.Browsable(false)]
public virtual object DefaultNewRowValue { get; }

[System.ComponentModel.Browsable(false)]
public virtual object? DefaultNewRowValue { get; }

[<System.ComponentModel.Browsable(false)>]
member this.DefaultNewRowValue : obj

Public Overridable ReadOnly Property DefaultNewRowValue As Object

Egenskapsvärde

Ett Object som representerar standardvärdet.

Attribut

BrowsableAttribute

Exempel

Följande kodexempel visar hur du åsidosätter DefaultNewRowValue egenskapen i en CalendarCell klass som härleds från DataGridViewTextBoxCell. Det här exemplet är en del av ett större kodexempel i How to: Host Controls in Windows Forms DataGridView Cells.

public class CalendarCell : DataGridViewTextBoxCell
{

    public CalendarCell()
        : base()
    {
        // Use the short date format.
        this.Style.Format = "d";
    }

    public override void InitializeEditingControl(int rowIndex, object 
        initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
    {
        // Set the value of the editing control to the current cell value.
        base.InitializeEditingControl(rowIndex, initialFormattedValue, 
            dataGridViewCellStyle);
        CalendarEditingControl ctl = 
            DataGridView.EditingControl as CalendarEditingControl;
        // Use the default row value when Value property is null.
        if (this.Value == null)
        {
            ctl.Value = (DateTime)this.DefaultNewRowValue;
        }
        else
        {
            ctl.Value = (DateTime)this.Value;
        }
    }

    public override Type EditType
    {
        get
        {
            // Return the type of the editing control that CalendarCell uses.
            return typeof(CalendarEditingControl);
        }
    }

    public override Type ValueType
    {
        get
        {
            // Return the type of the value that CalendarCell contains.
            
            return typeof(DateTime);
        }
    }

    public override object DefaultNewRowValue
    {
        get
        {
            // Use the current date and time as the default value.
            return DateTime.Now;
        }
    }
}

Public Class CalendarCell
    Inherits DataGridViewTextBoxCell

    Public Sub New()
        ' Use the short date format.
        Me.Style.Format = "d"
    End Sub

    Public Overrides Sub InitializeEditingControl(ByVal rowIndex As Integer, _
        ByVal initialFormattedValue As Object, _
        ByVal dataGridViewCellStyle As DataGridViewCellStyle)

        ' Set the value of the editing control to the current cell value.
        MyBase.InitializeEditingControl(rowIndex, initialFormattedValue, _
            dataGridViewCellStyle)

        Dim ctl As CalendarEditingControl = _
            CType(DataGridView.EditingControl, CalendarEditingControl)

        ' Use the default row value when Value property is null.
        If (Me.Value Is Nothing) Then
            ctl.Value = CType(Me.DefaultNewRowValue, DateTime)
        Else
            ctl.Value = CType(Me.Value, DateTime)
        End If
    End Sub

    Public Overrides ReadOnly Property EditType() As Type
        Get
            ' Return the type of the editing control that CalendarCell uses.
            Return GetType(CalendarEditingControl)
        End Get
    End Property

    Public Overrides ReadOnly Property ValueType() As Type
        Get
            ' Return the type of the value that CalendarCell contains.
            Return GetType(DateTime)
        End Get
    End Property

    Public Overrides ReadOnly Property DefaultNewRowValue() As Object
        Get
            ' Use the current date and time as the default value.
            Return DateTime.Now
        End Get
    End Property

End Class

Kommentarer

Egenskapen DefaultNewRowValue i basklassen DataGridViewCell returnerar nullalltid . Den här egenskapen kan dock åsidosättas i härledda cellklasser för att returnera andra standardvärden.

Värdet som returneras av den här egenskapen visas om cellen finns på raden för nya poster. Det här värdet kan åsidosättas av en hanterare för DataGridView.DefaultValuesNeeded händelsen när fokus anger raden för nya poster.

Se även

• DataGridView
• Value
• FormattedValue