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//设计一个继承自ComboBox的下拉框编辑列组件
public class DataGridViewComboBoxExEditingControl : ComboBox, IDataGridViewEditingControl
{
protected int rowIndex;
protected DataGridView dataGridView;
protected bool valueChanged = false;
protected override void OnTextChanged(System.EventArgs e)
{
base.OnTextChanged(e);
NotifyDataGridViewOfValueChange();
}
private void NotifyDataGridViewOfValueChange()
{
valueChanged = true;
dataGridView.NotifyCurrentCellDirty(true);
}
protected override void OnSelectedIndexChanged(EventArgs e)
{
base.OnTextChanged(e);
NotifyDataGridViewOfValueChange();
}
public Cursor EditingPanelCursor
{
get { return Cursors.IBeam; }
}
public DataGridView EditingControlDataGridView
{
get { return dataGridView; }
set { dataGridView = value; }
}
public object EditingControlFormattedValue
{
set
{
Text = value.ToString();
NotifyDataGridViewOfValueChange();
}
get
{
return this.Text;
}
}
public virtual object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
{
return Text;
}
public bool EditingControlWantsInputKey(Keys key, bool dataGridViewWantsInputKey)
{
switch (key & Keys.KeyCode)
{
case Keys.Left:
case Keys.Up:
case Keys.Down:
case Keys.Right:
case Keys.Home:
case Keys.End:
case Keys.Escape:
case Keys.Enter:
case Keys.PageDown:
case Keys.PageUp:
return true;
default:
return false;
}
}
public void PrepareEditingControlForEdit(bool selectAll)
{
if (selectAll)
{
SelectAll();
}
else
{
this.SelectionStart = this.ToString().Length;
}
}
public virtual bool RepositionEditingControlOnValueChange
{
get
{
return false;
}
}
public int EditingControlRowIndex
{
get { return this.rowIndex; }
set { this.rowIndex = value; }
}
public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
{
this.Font = dataGridViewCellStyle.Font;
this.ForeColor = dataGridViewCellStyle.ForeColor;
this.BackColor = dataGridViewCellStyle.BackColor;
}
public bool EditingControlValueChanged
{
get { return valueChanged; }
set { this.valueChanged = value; }
}
}
//定制该扩展列的单元格
public class DataGridViewComboBoxExCell:DataGridViewTextBoxCell
{
public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
DataGridViewComboBoxExEditingControl clt = DataGridView.EditingControl as DataGridViewComboBoxExEditingControl;
DataGridViewComboBoxExColumn col = (DataGridViewComboBoxExColumn)OwningColumn;
clt.DataSource = col.DataSource;
clt.DisplayMember = col.DisplayMember;
clt.ValueMember = col.ValueMember;
clt.Text = Convert.ToString(this.Value);
}
public override Type EditType
{
get
{
return typeof(DataGridViewComboBoxExEditingControl);
}
}
public override Type ValueType
{
get
{
return typeof(string);
}
}
public override object DefaultNewRowValue
{
get
{
return "";
}
}
}
//定制该扩展列
public class DataGridViewComboBoxExColumn : DataGridViewColumn
{
private object dataSoruce = null;
public object DataSource
{
get { return dataSoruce; }
set { dataSoruce = value; }
}
private string valueMember;
public string ValueMember
{
get { return valueMember; }
set { valueMember = value; }
}
private string displayMember;
public string DisplayMember
{
get { return displayMember; }
set { displayMember = value; }
}
public DataGridViewComboBoxExColumn()
: base(new DataGridViewComboBoxExCell())
{
}
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
if (value != null && !value.GetType().IsAssignableFrom(typeof(DataGridViewComboBoxExCell)))
{
throw new InvalidCastException("is not DataGridViewComboxExCell");
}
base.CellTemplate = value;
}
}
private DataGridViewComboBoxExCell ComboBoxCellTemplate
{
get
{
return (DataGridViewComboBoxExCell)this.CellTemplate;
}
}
}