DataGridView.CancelRowEdit 事件

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

發生於 DataGridView 控件的 VirtualMode 屬性 true，且使用者取消數據列中的編輯時發生。

public:
 event System::Windows::Forms::QuestionEventHandler ^ CancelRowEdit;

public event System.Windows.Forms.QuestionEventHandler CancelRowEdit;

member this.CancelRowEdit : System.Windows.Forms.QuestionEventHandler 

Public Custom Event CancelRowEdit As QuestionEventHandler 

事件類型

QuestionEventHandler

範例

下列程式代碼範例說明如何在虛擬模式中處理 DataGridView 控件的這個事件。 當控件處於編輯模式時，rowInEdit 變數會保存正在編輯之數據列的索引，而 customerInEdit 變數會保存對應至該數據列之 Customer 對象的參考。 當使用者取消編輯模式時，可以捨棄此物件。 不過，如果使用者編輯的數據列是新記錄的數據列，則會捨棄舊的 Customer 物件，並以新的物件取代，讓使用者可以再次開始進行編輯。 此範例是 逐步解說：在 Windows Forms DataGridView 控件中實作虛擬模式中較大型範例的一部分。

void dataGridView1_CancelRowEdit( Object^ /*sender*/,
    System::Windows::Forms::QuestionEventArgs^ /*e*/ )
{
   if ( this->rowInEdit == this->dataGridView1->Rows->Count - 2 &&
        this->rowInEdit == this->customers->Count )
   {
      
      // If the user has canceled the edit of a newly created row, 
      // replace the corresponding Customer object with a new, empty one.
      this->customerInEdit = gcnew Customer;
   }
   else
   {
      
      // If the user has canceled the edit of an existing row, 
      // release the corresponding Customer object.
      this->customerInEdit = nullptr;
      this->rowInEdit = -1;
   }
}

private void dataGridView1_CancelRowEdit(object sender,
    System.Windows.Forms.QuestionEventArgs e)
{
    if (this.rowInEdit == this.dataGridView1.Rows.Count - 2 &&
        this.rowInEdit == this.customers.Count)
    {
        // If the user has canceled the edit of a newly created row, 
        // replace the corresponding Customer object with a new, empty one.
        this.customerInEdit = new Customer();
    }
    else
    {
        // If the user has canceled the edit of an existing row, 
        // release the corresponding Customer object.
        this.customerInEdit = null;
        this.rowInEdit = -1;
    }
}

Private Sub dataGridView1_CancelRowEdit(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.QuestionEventArgs) _
    Handles dataGridView1.CancelRowEdit

    If Me.rowInEdit = Me.dataGridView1.Rows.Count - 2 AndAlso _
        Me.rowInEdit = Me.customers.Count Then

        ' If the user has canceled the edit of a newly created row, 
        ' replace the corresponding Customer object with a new, empty one.
        Me.customerInEdit = New Customer()

    Else

        ' If the user has canceled the edit of an existing row, 
        ' release the corresponding Customer object.
        Me.customerInEdit = Nothing
        Me.rowInEdit = -1

    End If

End Sub

備註

當 DataGridView 處於虛擬模式時，預設會將變更認可至數據格層級的數據快取。 實作數據列層級交易時，可以使用 CancelRowEdit 事件。

如需如何處理事件的詳細資訊，請參閱 處理和引發事件。

另請參閱

• DataGridView 控制件 （Windows Forms）