Редактиране

Споделяне чрез

How to: Specify Concurrency-Conflict Checking

  • Статия

You can specify which columns of the database are to be checked for concurrency conflicts when you call SubmitChanges. For more information, see How to: Specify Which Members are Tested for Concurrency Conflicts.

Example

The following code specifies that the HomePage member should never be tested during update checks. For more information, see UpdateCheck.

[Column(Storage="_HomePage", DbType="NText", UpdateCheck=UpdateCheck.Never)]
public string HomePage
{
    get
    {
        return this._HomePage;
    }
    set
    {
        if ((this._HomePage != value))
    {
        this.OnHomePageChanging(value);
        this.SendPropertyChanging();
            this._HomePage = value;
        this.SendPropertyChanged("HomePage");
            this.OnHomePageChanged();
    }
    }
}

<Column(Storage:="_HomePage", DbType:="NText", UpdateCheck:=UpdateCheck.Never)>  _
Public Property HomePage() As String
    Get
        Return Me._HomePage
    End Get
    Set(ByVal value As String)
        If ((Me._HomePage <> value)  _
            = false) Then
        Me.OnHomePageChanging(value)
            Me.SendPropertyChanging
            Me._HomePage = value
            Me.SendPropertyChanged("HomePage")
            Me.OnHomePageChanged
        End If
    End Set
End Property

See also