ColumnAttribute.CanBeNull Eigenschap

public:
 property bool CanBeNull { bool get(); void set(bool value); };

public bool CanBeNull { get; set; }

member this.CanBeNull : bool with get, set

Public Property CanBeNull As Boolean

Waarde van eigenschap

Standaard = true.

Voorbeelden

[Column(Storage="_LastName", DbType="NVarChar(20) NOT NULL", CanBeNull=false)]
public string LastName
{
    get
    {
        return this._LastName;
    }
    set
    {
        if ((this._LastName != value))
        {
            this.OnLastNameChanging(value);
            this.SendPropertyChanging();
            this._LastName = value;
            this.SendPropertyChanged("LastName");
            this.OnLastNameChanged();
        }
    }
}

<Column(Storage:="_LastName", DbType:="NVarChar(20) NOT NULL", CanBeNull:=false)>  _
Public Property LastName() As String
    Get
        Return Me._LastName
    End Get
    Set
        If ((Me._LastName = value)  _
                    = false) Then
            Me.OnLastNameChanging(value)
            Me.SendPropertyChanging
            Me._LastName = value
            Me.SendPropertyChanged("LastName")
            Me.OnLastNameChanged
        End If
    End Set
End Property

Opmerkingen

Als u deze waarde falseinstelt op, wordt ervan uitgegaan dat de gegevens in de corresponderende kolom niet null zijn.