AcceptRejectRule 列舉
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
判斷在具有 ForeignKeyConstraint 的 DataTable 上叫用 AcceptChanges() 或 RejectChanges() 方法時會發生的動作。
public enum class AcceptRejectRuleC#
public enum AcceptRejectRuletype AcceptRejectRule = Public Enum AcceptRejectRule- 繼承
| 名稱 | 值 | Description |
|---|---|---|
| Cascade | 1 | 跨越關聯性來串聯變更。 |
| None | 0 | 未發生任何動作 (預設值)。 |
下列範例會 ForeignKeyConstraint建立 、設定其各種屬性，包括 AcceptRejectRule，並將它新增至 DataTable 物件的 ConstraintCollection。
C#
private void CreateConstraint(DataSet dataSet,
string table1, string table2,string column1, string column2)
{
// Declare parent column and child column variables.
DataColumn parentColumn;
DataColumn childColumn;
ForeignKeyConstraint foreignKeyConstraint;
// Set parent and child column variables.
parentColumn = dataSet.Tables[table1].Columns[column1];
childColumn = dataSet.Tables[table2].Columns[column2];
foreignKeyConstraint = new ForeignKeyConstraint
("SupplierForeignKeyConstraint", parentColumn, childColumn);
// Set null values when a value is deleted.
foreignKeyConstraint.DeleteRule = Rule.SetNull;
foreignKeyConstraint.UpdateRule = Rule.Cascade;
foreignKeyConstraint.AcceptRejectRule = AcceptRejectRule.None;
// Add the constraint, and set EnforceConstraints to true.
dataSet.Tables[table1].Constraints.Add(foreignKeyConstraint);
dataSet.EnforceConstraints = true;
}
Private Sub CreateConstraint(dataSet As DataSet, _
table1 As String, table2 As String, _
column1 As String, column2 As String)
' Declare parent column and child column variables.
Dim parentColumn As DataColumn
Dim childColumn As DataColumn
Dim foreignKeyConstraint As ForeignKeyConstraint
' Set parent and child column variables.
parentColumn = dataSet.Tables(table1).Columns(column1)
childColumn = dataSet.Tables(table2).Columns(column2)
foreignKeyConstraint = New ForeignKeyConstraint _
("SupplierForeignKeyConstraint", parentColumn, childColumn)
' Set null values when a value is deleted.
foreignKeyConstraint.DeleteRule = Rule.SetNull
foreignKeyConstraint.UpdateRule = Rule.Cascade
foreignKeyConstraint.AcceptRejectRule = AcceptRejectRule.None
' Add the constraint, and set EnforceConstraints to true.
dataSet.Tables(table1).Constraints.Add(foreignKeyConstraint)
dataSet.EnforceConstraints = True
End Sub
DataTable直到您呼叫 方法之後，AcceptChanges變更才會結束。 AcceptChanges在父數據表的數據列上呼叫 或 RejectChanges 時，AcceptRejectRule值會決定是否將變更傳播至子數據表中的對應數據列。
| 產品 | 版本 |
|---|---|
| .NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 2.0, 2.1 |
