DataGridViewコントロールとGcMultiRowコントロールでそれぞれセル編集コントロール(EditingControl)のTextChangedイベントを実装したとき、イベントの発生回数が異なります。これは、GcMultiRowコントロールがセル移動時にセル編集コントロールの編集開始位置が常に適正になるように、内部で一度EditingControl.Textプロパティを初期化していることによるものです。

次のコードは、この現象を確認します。

[Visual Basic]

Imports GrapeCity.Win.MultiRow

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
　　DataGridView1.RowCount = 10
　　For i As Integer = 0 To DataGridView1.RowCount - 1
　　　　DataGridView1.Rows(i).Cells(0).Value = i
　　Next

　　Dim textBoxCell = New TextBoxCell()
　　textBoxCell.Name = "textBoxCell"
　　GcMultiRow1.Template = Template.CreateGridTemplate(New Cell() {textBoxCell})
　　GcMultiRow1.RowCount = 10
　　For i As Integer = 0 To GcMultiRow1.RowCount - 1
　　　　GcMultiRow1.SetValue(i, "textBoxCell", i)
　　Next
End Sub

Private Sub DataGridView1_EditingControlShowing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles DataGridView1.EditingControlShowing
　 If TypeOf DataGridView1.CurrentCell Is DataGridViewTextBoxCell Then
　　　 Dim textBox As DataGridViewTextBoxEditingControl = TryCast(e.Control, DataGridViewTextBoxEditingControl)
　　　 RemoveHandler textBox.TextChanged, AddressOf dataGridView_textBox_TextChanged
　　　　AddHandler textBox.TextChanged, AddressOf dataGridView_textBox_TextChanged
　　End If
End Sub

Private Sub dataGridView_textBox_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
　　Dim textBox As DataGridViewTextBoxEditingControl = TryCast(sender, DataGridViewTextBoxEditingControl)
　　Console.WriteLine("DataGridView_textBox_TextChanged:{0}", textBox.Text)
End Sub

Private Sub GcMultiRow1_EditingControlShowing(ByVal sender As System.Object, ByVal e As GrapeCity.Win.MultiRow.EditingControlShowingEventArgs) Handles GcMultiRow1.EditingControlShowing
　 If TypeOf GcMultiRow1.CurrentCell Is TextBoxCell Then
　　　 Dim textBox As TextBoxEditingControl = TryCast(e.Control, TextBoxEditingControl)
　　　　RemoveHandler textBox.TextChanged, AddressOf gcMultiRow_textBox_TextChanged
　　　　AddHandler textBox.TextChanged, AddressOf gcMultiRow_textBox_TextChanged
　　End If
End Sub

Private Sub gcMultiRow_textBox_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
　　Dim textBox As TextBoxEditingControl = TryCast(sender, TextBoxEditingControl)
　　Console.WriteLine("GcMultiRow_textBox_TextChanged:{0}", textBox.Text)
End Sub

[C#]

using GrapeCity.Win.MultiRow;

private void Form1_Load(object sender, EventArgs e)
{
　　dataGridView1.RowCount = 10;
　　for (int i = 0; i < dataGridView1.RowCount; i++)
　　{
　　　　dataGridView1.Rows[i].Cells[0].Value = i;
　　}
　　dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);
　　
　　TextBoxCell textBoxCell = new TextBoxCell();
　　textBoxCell.Name = "textBoxCell";
　　
　　gcMultiRow1.Template = Template.CreateGridTemplate(new Cell[] { textBoxCell });
　　gcMultiRow1.RowCount = 10;
　　
　　for (int i = 0; i < gcMultiRow1.RowCount; i++)
　　{
　　　　gcMultiRow1.SetValue(i, "textBoxCell", i);
　　}
　　gcMultiRow1.EditingControlShowing += new EventHandler<GrapeCity.Win.MultiRow.EditingControlShowingEventArgs>(gcMultiRow1_EditingControlShowing);
}

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
　　if (dataGridView1.CurrentCell is DataGridViewTextBoxCell)
　　{
　　　　DataGridViewTextBoxEditingControl textBox = e.Control as DataGridViewTextBoxEditingControl;
　　　　textBox.TextChanged -= new EventHandler(dataGridView_textBox_TextChanged);
　　　　textBox.TextChanged += new EventHandler(dataGridView_textBox_TextChanged);
　　}
}

private void dataGridView_textBox_TextChanged(object sender, EventArgs e)
{
　　DataGridViewTextBoxEditingControl textBox = sender as DataGridViewTextBoxEditingControl;
　　Console.WriteLine("DataGridView_textBox_TextChanged:{0}", textBox.Text);
}

private void gcMultiRow1_EditingControlShowing(object sender, EditingControlShowingEventArgs e)
{
　　if (gcMultiRow1.CurrentCell is TextBoxCell)
　　{
　　　　TextBoxEditingControl textBox = e.Control as TextBoxEditingControl;
　　　　textBox.TextChanged -= new EventHandler(gcMultiRow_textBox_TextChanged);
　　　　textBox.TextChanged += new EventHandler(gcMultiRow_textBox_TextChanged);
　　}
}

private void gcMultiRow_textBox_TextChanged(object sender, EventArgs e)
{
　　TextBoxEditingControl textBox = sender as TextBoxEditingControl;
　　Console.WriteLine("GcMultiRow_textBox_TextChanged:{0}", textBox.Text);
}

この現象を回避し、DataGridViewと同じ回数だけEditingControl.TextChangedイベントを発生させるには、次のようにコードを書き換えます。

[Visual Basic]

Private editingControlRemoving As Boolean = False

Private Sub GcMultiRow1_ControlRemoved(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ControlEventArgs) Handles GcMultiRow1.ControlRemoved
　　If e.Control Is GcMultiRow1.EditingPanel Then
　　　　editingControlRemoving = True
　　　　GcMultiRow1.EditingControl.Text = String.Empty
　　　　editingControlRemoving = False
　　End If
End Sub

Private Sub gcMultiRow_textBox_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
　　Dim textBox As TextBoxEditingControl = TryCast(sender, TextBoxEditingControl)
　　If Not editingControlRemoving Then
　　　　Console.WriteLine("GcMultiRow_textBox_TextChanged:{0}", textBox.Text)
　　End If
End Sub

[C#]

private void Form1_Load(object sender, EventArgs e)
{
　　...
　　// 以下のコードを追加
　　gcMultiRow1.ControlRemoved += new ControlEventHandler(gcMultiRow1_ControlRemoved);
}

bool editingControlRemoving = false;

private void gcMultiRow1_ControlRemoved(object sender, ControlEventArgs e)
{
　　if (e.Control == gcMultiRow1.EditingPanel)
　　{
　　　　editingControlRemoving = true;
　　　　gcMultiRow1.EditingControl.Text = string.Empty;
　　　　editingControlRemoving = false;
　　}
}

private void gcMultiRow_textBox_TextChanged(object sender, EventArgs e)
{
　　TextBoxEditingControl textBox = sender as TextBoxEditingControl;

　　if (!editingControlRemoving)
　　{
　　　　Console.WriteLine("gcMultiRow_textBox_TextChanged:{0}", textBox.Text);
　　}
}

セルの移動時にEditingControl.TextChangedイベントを発生させず、ユーザーによる編集が行われた場合のみEditingControl.TextChangedイベントを発生させるには、次のように書き換えます。

[Visual Basic]

Private _currentCellPosition As CellPosition = CellPosition.Empty

Private Sub GcMultiRow1_EditingControlShowing(ByVal sender As System.Object, ByVal e As GrapeCity.Win.MultiRow.EditingControlShowingEventArgs) Handles GcMultiRow1.EditingControlShowing
　　If TypeOf GcMultiRow1.CurrentCell Is TextBoxCell Then
　　　　_currentCellPosition = GcMultiRow1.CurrentCellPosition
　　　　Dim textBox As TextBoxEditingControl = TryCast(e.Control, TextBoxEditingControl)
　　　　RemoveHandler textBox.TextChanged, AddressOf gcMultiRow_textBox_TextChanged
　　　　AddHandler textBox.TextChanged, AddressOf gcMultiRow_textBox_TextChanged
　　End If
End Sub

Private Sub gcMultiRow_textBox_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
　　Dim textBox As TextBoxEditingControl = TryCast(sender, TextBoxEditingControl)
　　If textBox.GcMultiRow.CurrentCellPosition.Equals(_currentCellPosition) Then
　　　　Console.WriteLine("GcMultiRow_textBox_TextChanged:{0}", textBox.Text)
　　End If
End Sub

[C#]

private CellPosition _currentCellPosition = CellPosition.Empty;

private void gcMultiRow1_EditingControlShowing(object sender, EditingControlShowingEventArgs e)
{
　　if (gcMultiRow1.CurrentCell is TextBoxCell)
　　{
　　　　_currentCellPosition = gcMultiRow1.CurrentCellPosition;
　　　　TextBoxEditingControl textBox = e.Control as TextBoxEditingControl;
　　　　textBox.TextChanged -= new EventHandler(gcMultiRow_textBox_TextChanged);
　　　　textBox.TextChanged += new EventHandler(gcMultiRow_textBox_TextChanged);
　　}
}

private void gcMultiRow_textBox_TextChanged(object sender, EventArgs e)
{
　　TextBoxEditingControl textBox = sender as TextBoxEditingControl;
　　if (textBox.GcMultiRow.CurrentCellPosition.Equals(_currentCellPosition))
　　{
　　　　Console.WriteLine("gcMultiRow_textBox_TextChanged:{0}", textBox.Text);
　　}
}

EditingControl.TextChangedイベントの代わりにGcMultiRow.CellEditedFormattedValueChangedイベントを使用することもできます。