ColumnAttribute.IsDiscriminator 屬性

定義

命名空間:
System.Data.Linq.Mapping
組件:
System.Data.Linq.dll

取得或設定欄位是否包含 LINQ 至 SQL 繼承階層的判別值。

public:
 property bool IsDiscriminator { bool get(); void set(bool value); };
public bool IsDiscriminator { get; set; }
member this.IsDiscriminator : bool with get, set
Public Property IsDiscriminator As Boolean

屬性值

Boolean

預設值 = false。

範例

[Column(Storage="_Title", DbType="NVarChar(30)",IsDiscriminator=true)]
public string Title
{
    get
    {
        return this._Title;
    }
    set
    {
        if ((this._Title != value))
        {
            this.OnTitleChanging(value);
            this.SendPropertyChanging();
            this._Title = value;
            this.SendPropertyChanged("Title");
            this.OnTitleChanged();
        }
    }
}

   <Column(Storage:="_Title", DbType:="NVarChar(30)", IsDiscriminator:=True)> _
Public Property Title() As String
       Get
           Return Me._Title
       End Get
       Set(ByVal value As String)
           If ((Me._Title = Value) _
              = False) Then
               Me.OnTitleChanging(Value)
               Me.SendPropertyChanging()
               Me._Title = Value
               Me.SendPropertyChanged("Title")
               Me.OnTitleChanged()
           End If
       End Set
   End Property

備註

當 true時，此屬性識別該類別成員持有繼承階層的判別值。

你可以將此屬性 true 設為最多一個成員，且必須屬於階層結構中最頂端的映射類別。

適用於