當組合框中的選擇更改時，DataGridView中的提交已更改

Question

編輯單元格中的ComboBox編輯控件更改其選擇後，如何強制引發DataGridView.CellValueChanged事件（並將其更改爲DataGridViewCell.Value屬性）？默認情況下，該事件僅在具有ComboBox的單元失去焦點後纔會引發。

Answer 1

我解決了它這樣做：

myDataGridView.EditingControlShowing += new System.Windows.Forms.DataGridViewEditingControlShowingEventHandler(myDataGridView_EditingControlShowing); 

    private void myDataGridView_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) 
    { 
     if (e.Control.GetType() == typeof(DataGridViewComboBoxEditingControl)) 
     { 
      ComboBox cmb = (ComboBox)e.Control; 
      cmb.SelectionChangeCommitted -= new EventHandler(cmb_SelectionChangeCommitted); 
      cmb.SelectionChangeCommitted += new EventHandler(cmb_SelectionChangeCommitted); 
     } 
    } 

    void cmb_SelectionChangeCommitted(object sender, EventArgs e) 
    { 
     dgvPresupuesto.CurrentCell.Value = ((DataGridViewComboBoxEditingControl)sender).EditingControlFormattedValue; 
    } 

Answer 2

組合框的值的變化實際上是與網格關聯的編輯控件。 因此，要啓動什麼，你將不得不添加這些在DataGrid的EditingControlShowing事件爲特定列

private void dg_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) 
{ 
    if (dg.CurrentCell.ColumnIndex == 0) 
    { 
    ComboBox cmbox = e.Control as ComboBox; 
    cmbox.SelectedValueChanged += new EventHandler(cmbox_SelectedValueChanged); 
    } 
} 

你可以調用在下拉列表中選擇cvalue改變事件的單元格的值更改事件

Answer 3

我最終這樣做了。我不知道如果是這樣的「首選」的方式或是否會產生任何副作用以後，但現在它似乎工作：

this.gridView.EditingControlShowing += this.GridViewOnEditingControlShowing; 

private void GridViewOnEditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) 
{ 
    ComboBox cellComboBox = e.Control as ComboBox; 
    if (cellComboBox != null) 
    { 
     // make sure the handler doen't get registered twice 
     cellComboBox.SelectionChangeCommitted -= this.CellComboBoxOnelectionChangeCommitted; 
     cellComboBox.SelectionChangeCommitted += this.CellComboBoxOnelectionChangeCommitted; 
    } 
} 

private void CellComboBoxOnelectionChangeCommitted(object sender, EventArgs e) 
{ 
    DataGridViewComboBoxEditingControl comboBox = sender as DataGridViewComboBoxEditingControl; 
    if (sender == null) 
    { 
     return; 
    }  
    if (comboBox.SelectedValue == null) 
    { 
     return; 
    }  
    if (this.gridView.CurrentCell.Value == comboBox.SelectedValue) 
    { 
     return; 
    }  
    this.gridView.CurrentCell.Value = comboBox.SelectedValue;   
}