UpdateCheck UpdateCheck UpdateCheck UpdateCheck Enum

定义

指定何时测试对象是否有并发冲突。Specifies when objects are to be tested for concurrency conflicts.

public enum class UpdateCheck
public enum UpdateCheck
type UpdateCheck = 
Public Enum UpdateCheck
继承

字段

Always Always Always Always 0

始终进行检查。Always check. 此为默认值,除非对某个成员而言 IsVersiontrueThis is the default unless IsVersion is true for a member.

Never Never Never Never 1

从不检查。Never check.

WhenChanged WhenChanged WhenChanged WhenChanged 2

仅在已更改对象后检查。Check only when the object has been changed.

示例

[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

注解

表后的代码示例指定HomePage绝不应测试对象。The code example after the table specifies that HomePage objects should never be tested.

适用于