怎样用自定义控件编辑DataGridView(WinForm)单元格的值,比如用一个ComboBox?就是说,当单元格需要编辑时(双击翘足或者得到焦点),就把相应的编辑器(ComboBox、TextBox等)移动到该单元格上并显示出来。编辑结束(失去焦点或者又双击了别的单元格),把编辑器的值赋给相应的单元格或者底下的数据源。
哪位网友有经验,请教一下,最好能贴出代码。
谢谢!
哪位网友有经验,请教一下,最好能贴出代码。
谢谢!
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MSDN:
开发工具和语言
Visual Studio文档
基于Windows的应用程序,组件和服务
创建基于Windows的应用程序
Window 窗体
Window窗体入门
Windows窗体控件
用于Windows窗体上的控件
DataGridView控件
自定义Window窗体DataGridView控件
如何:在 Windows 窗体 DataGridView 单元格中承载控件
DataGridView 控件提供了多种列类型,使得用户可以通过多种方式输入和编辑值。但是,如果这些列类型无法满足数据输入要求,您也可以使用承载所选控件的单元格创建自己的列类型。要做到这一点,必须定义派生自 DataGridViewColumn 和 DataGridViewCell 的类。您还必须定义派生自 Control 并实现 IDataGridViewEditingControl 接口的类。下面的代码示例演示如何创建日历列。此列的单元格在普通的文本框单元格中显示日期,但当用户编辑单元格时,就会出现 DateTimePicker 控件。为了避免必须再次实现文本框显示功能,CalendarCell 类从 DataGridViewTextBoxCell 类派生,而不是直接从 DataGridViewCell 类继承。注意
当从 DataGridViewCell 或 DataGridViewColumn 派生并向派生类添加新属性时,请确保重写 Clone 方法以便在克隆操作期间复制新属性。还应调用基类的 Clone 方法,以便将基类的属性复制到新的单元格或列中。
using System;
using System.Windows.Forms;public class CalendarColumn : DataGridViewColumn
{
public CalendarColumn() : base(new CalendarCell())
{
} public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
// Ensure that the cell used for the template is a CalendarCell.
if (value != null &&
!value.GetType().IsAssignableFrom(typeof(CalendarCell)))
{
throw new InvalidCastException("Must be a CalendarCell");
}
base.CellTemplate = value;
}
}
}public class CalendarCell : DataGridViewTextBoxCell
{ public CalendarCell()
: base()
{
// Use the short date format.
this.Style.Format = "d";
} public override void InitializeEditingControl(int rowIndex, object
initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
// Set the value of the editing control to the current cell value.
base.InitializeEditingControl(rowIndex, initialFormattedValue,
dataGridViewCellStyle);
CalendarEditingControl ctl =
DataGridView.EditingControl as CalendarEditingControl;
ctl.Value = (DateTime)this.Value;
} public override Type EditType
{
get
{
// Return the type of the editing contol that CalendarCell uses.
return typeof(CalendarEditingControl);
}
} public override Type ValueType
{
get
{
// Return the type of the value that CalendarCell contains.
return typeof(DateTime);
}
} public override object DefaultNewRowValue
{
get
{
// Use the current date and time as the default value.
return DateTime.Now;
}
}
}class CalendarEditingControl : DateTimePicker, IDataGridViewEditingControl
{
DataGridView dataGridView;
private bool valueChanged = false;
int rowIndex; public CalendarEditingControl()
{
this.Format = DateTimePickerFormat.Short;
} // Implements the IDataGridViewEditingControl.EditingControlFormattedValue
// property.
public object EditingControlFormattedValue
{
get
{
return this.Value.ToShortDateString();
}
set
{
String newValue = value as String;
if (newValue != null)
{
this.Value = DateTime.Parse(newValue);
}
}
} // Implements the
// IDataGridViewEditingControl.GetEditingControlFormattedValue method.
public object GetEditingControlFormattedValue(
DataGridViewDataErrorContexts context)
{
return EditingControlFormattedValue;
} // Implements the
// IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
public void ApplyCellStyleToEditingControl(
DataGridViewCellStyle dataGridViewCellStyle)
{
this.Font = dataGridViewCellStyle.Font;
this.CalendarForeColor = dataGridViewCellStyle.ForeColor;
this.CalendarMonthBackground = dataGridViewCellStyle.BackColor;
} // Implements the IDataGridViewEditingControl.EditingControlRowIndex
// property.
public int EditingControlRowIndex
{
get
{
return rowIndex;
}
set
{
rowIndex = value;
}
} // Implements the IDataGridViewEditingControl.EditingControlWantsInputKey
// method.
public bool EditingControlWantsInputKey(
Keys key, bool dataGridViewWantsInputKey)
{
// Let the DateTimePicker handle the keys listed.
switch (key & Keys.KeyCode)
{
case Keys.Left:
case Keys.Up:
case Keys.Down:
case Keys.Right:
case Keys.Home:
case Keys.End:
case Keys.PageDown:
case Keys.PageUp:
return true;
default:
return false;
}
} // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
// method.
public void PrepareEditingControlForEdit(bool selectAll)
{
// No preparation needs to be done.
} // Implements the IDataGridViewEditingControl
// .RepositionEditingControlOnValueChange property.
public bool RepositionEditingControlOnValueChange
{
get
{
return false;
}
} // Implements the IDataGridViewEditingControl
// .EditingControlDataGridView property.
public DataGridView EditingControlDataGridView
{
get
{
return dataGridView;
}
set
{
dataGridView = value;
}
} // Implements the IDataGridViewEditingControl
// .EditingControlValueChanged property.
public bool EditingControlValueChanged
{
get
{
return valueChanged;
}
set
{
valueChanged = value;
}
} // Implements the IDataGridViewEditingControl
// .EditingPanelCursor property.
public Cursor EditingPanelCursor
{
get
{
return base.Cursor;
}
} protected override void OnValueChanged(EventArgs eventargs)
{
// Notify the DataGridView that the contents of the cell
// have changed.
valueChanged = true;
this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
base.OnValueChanged(eventargs);
}
}public class Form1 : Form
{
private DataGridView dataGridView1 = new DataGridView(); [STAThreadAttribute()]
public static void Main()
{
Application.Run(new Form1());
} public Form1()
{
this.dataGridView1.Dock = DockStyle.Fill;
this.Controls.Add(this.dataGridView1);
this.Load += new EventHandler(Form1_Load);
this.Text = "DataGridView calendar column demo";
} private void Form1_Load(object sender, EventArgs e)
{
CalendarColumn col = new CalendarColumn();
this.dataGridView1.Columns.Add(col);
this.dataGridView1.RowCount = 5;
foreach (DataGridViewRow row in this.dataGridView1.Rows)
{
row.Cells[0].Value = DateTime.Now;
}
}
}
一般来说需要三个类来实现一种新的编辑控件(DataGridViewEditingControl),分别是EditingControl,该类继承自IDataGridViewEditingControl,即是你的自定义控件;Cell类,该类继承自DataGridViewCell由Column承载;还有一个DataGridView
Column类用来存储列的某些正常运行需要的东东~
{
//cobTest 为隐藏的ComboBox控件,点击DataGridView中第三列的任意一行可进行下拉选择项,
如果值更改可写此控件的值更改事件,将DataGridView中其它列有下拉选项的值重新绑定或更改文本值
cobTest.Items.Add("");
cobTest.Visible = true;
cobTest.Items.Clear();
int tt = 0;
if (null != relateSwitchDevice)
{
for (int destPortIndex = 0; destPortIndex < relateSwitchDevice.destPort.Count; destPortIndex++)
{
SwitchDestPort destPort = (SwitchDestPort)relateSwitchDevice.destPort[destPortIndex];
if (destPort.name.Equals(dgvTally.Rows[e.RowIndex].Cells[3].Value.ToString()))
{
tt = destPortIndex;
}
cobTest.Items.Add(destPort.name);
}
cobTest.SelectedIndex = tt;
} int height = 0;
for (int k = 0; k < e.RowIndex; k++)
{
if (dgvTally.Rows[k].Displayed)
{
height = height + dgvTally.Rows[k].Cells[3].OwningRow.Height;
} }
cobTest.Width = dgvTally.Rows[e.RowIndex].Cells[3].Size.Width;
cobTest.Height = dgvTally.Rows[e.RowIndex].Cells[3].Size.Height;
Point po = new Point((dgvTally.Location.X + dgvTally.Rows[e.RowIndex].Cells[0].OwningColumn.Width + dgvTally.Rows[e.RowIndex].Cells[1].OwningColumn.Width + dgvTally.Rows[e.RowIndex].Cells[2].OwningColumn.Width), (dgvTally.Location.Y + dgvTally.TopLeftHeaderCell.Size.Height + height));//dgvTally 为DataGridView控件
cobTest.Location = po;//所点击的位置
}