在DataGridViewComboBoxColumn中触发的事件SelectedIndexChanged

Question

我有DataGridView有两列。第一列是TextBoxCol(DataGridViewTextBoxColumn)，第二列是ComboBoxCol(DataGridViewComboBoxColumn)。

当ComboBoxCol更改其选定索引值时，如何更改TextBoxCol的值？ （当选择指数ComboBoxCol改变这应该发生的。离开塔后不一样，dataGridView_CellValueChanged）

我看过一个话题几乎，我有同样的问题，但我不明白的答案（这应该是正确的基于复选标记）。这是链接。 -Almost same topic

Answer 1

给这两个简单的方法去（即“1 '在最上面的方法是组合框的索引）

你会让你修改的行将是setter行cel.Value =，因为你可以改变它为任何你喜欢的。

---

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) 
    { 
     if (dataGridView1.CurrentCell.ColumnIndex == 1 && e.Control is ComboBox) 
     { 
      ComboBox comboBox = e.Control as ComboBox; 
      comboBox.SelectedIndexChanged -= LastColumnComboSelectionChanged; 
      comboBox.SelectedIndexChanged += LastColumnComboSelectionChanged; 
     } 
    } 

    private void LastColumnComboSelectionChanged(object sender, EventArgs e) 
    { 
     var currentcell = dataGridView1.CurrentCellAddress; 
     var sendingCB = sender as DataGridViewComboBoxEditingControl; 
     DataGridViewTextBoxCell cel = (DataGridViewTextBoxCell)dataGridView1.Rows[currentcell.Y].Cells[0]; 
     cel.Value = sendingCB.EditingControlFormattedValue.ToString(); 
    } 

---

Answer 2

该链接是正确的。处理DataGridView的EditingControlShowing event。在这个事件处理程序中，检查当前列是否符合您的兴趣。和，然后创建一个临时组合框对象： -

ComboBox comboBox = e.Control as ComboBox;

MSDN具有样品：参见实施例部分here。 注意在MSDN链接Inheritance Hierarchy & Class Syntax： -

公共类DataGridViewComboBoxEditingControl：组合框， IDataGridViewEditingControl

private DataGridView dataGridView1 = new DataGridView(); 

private void AddColorColumn() 
{ 
    DataGridViewComboBoxColumn comboBoxColumn = 
     new DataGridViewComboBoxColumn(); 
    comboBoxColumn.Items.AddRange(
     Color.Red, Color.Yellow, Color.Green, Color.Blue); 
    comboBoxColumn.ValueType = typeof(Color); 
    dataGridView1.Columns.Add(comboBoxColumn); 
    dataGridView1.EditingControlShowing += 
     new DataGridViewEditingControlShowingEventHandler(
     dataGridView1_EditingControlShowing); 
} 

private void dataGridView1_EditingControlShowing(object sender, 
    DataGridViewEditingControlShowingEventArgs e) 
{ 
    ComboBox combo = e.Control as ComboBox; 
    if (combo != null) 
    { 
     // Remove an existing event-handler, if present, to avoid 
     // adding multiple handlers when the editing control is reused. 
     combo.SelectedIndexChanged -= 
      new EventHandler(ComboBox_SelectedIndexChanged); 

     // Add the event handler. 
     combo.SelectedIndexChanged += 
      new EventHandler(ComboBox_SelectedIndexChanged); 
    } 
} 

private void ComboBox_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    ((ComboBox)sender).BackColor = (Color)((ComboBox)sender).SelectedItem; 
} 

Answer 3

这个答案是在几个地方左右浮动。使用DataGridViewEditingControlShowingEventHandler将触发比您想要的更多的事件。在我的测试中，它多次启动了该事件。同样使用combo.SelectedIndexChanged - =事件不会真的删除事件，它们只是保持堆叠。无论如何，我找到了一个似乎可行的解决方案。我包括下面的代码示例：

  // Add the events to listen for 
     dataGridView1.CellValueChanged += 
      new DataGridViewCellEventHandler(dataGridView1_CellValueChanged); 
     dataGridView1.CurrentCellDirtyStateChanged += 
      new EventHandler(dataGridView1_CurrentCellDirtyStateChanged); 

    // This event handler manually raises the CellValueChanged event 
    // by calling the CommitEdit method. 
    void dataGridView1_CurrentCellDirtyStateChanged(object sender, 
     EventArgs e) 
    { 
     if (dataGridView1.IsCurrentCellDirty) 
     { 
      // This fires the cell value changed handler below 
      dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit); 
     } 
    } 

    private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e) 
    { 
     // My combobox column is the second one so I hard coded a 1, flavor to taste 
     DataGridViewComboBoxCell cb = (DataGridViewComboBoxCell)dataGridView1.Rows[e.RowIndex].Cells[1]; 
     if (cb.Value != null) 
     { 
       // do stuff 
       dataGridView1.Invalidate(); 
     } 
    }