ColumnAttribute.IsVersion Property
Definition
Important
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Gets or sets whether the column type of the member is a database timestamp or version number.
public:
property bool IsVersion { bool get(); void set(bool value); };public bool IsVersion { get; set; }member this.IsVersion : bool with get, setPublic Property IsVersion As BooleanProperty Value
Default value = false.
Examples
[Column(Storage = "_VersionNum", DbType = "Int NOT NULL IDENTITY", IsVersion=true)]
public int VersionNum
{
get
{
return this._VersionNum;
}
set
{
if ((this._VersionNum != value))
{
this._VersionNum = value;
}
}
}
<Column(Storage:="_VersionNum", DbType:="Int NOT NULL IDENTITY", IsVersion:=True)> _
Public Property VersionNum() As Integer
Get
Return Me._VersionNum
End Get
Set(ByVal value As Integer)
If ((Me._VersionNum = value) _
= False) Then
Me._EmployeeID = value
End If
End Set
End Property
Remarks
Version numbers are incremented and timestamp columns are updated every time that the associated row is updated. (This property tells LINQ to SQL that a column should be updated to show that it is a new version; it is not meant to record information such as who made the update.)
Note the following when IsVersion is true:
- Use DbType to specify the correct modifiers to designate a version number or timestamp column. If you do not specify DbType, LINQ to SQL infers the correct modifiers.
Version numbers are incremented and timestamp columns are updated every time that the associated row is updated. Members with IsVersion=true are synchronized immediately after the data row is updated. The new values are visible after SubmitChanges finishes.
