在 DataGridView 单元格中托管控件 - Windows Forms .NET Framework

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DataGridView 控件提供了几种列类型，使用户能够以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录入的需求，可以自主创建带有承载所选控件的单元格的列类型。为此，必须定义派生自 DataGridViewColumn 和 DataGridViewCell 的类。还必须定义派生自 Control 的类并实现 IDataGridViewEditingControl 接口。

下面的代码示例演示如何创建日历列。此列的单元格将显示普通的文本框单元格中的日期，但当用户编辑单元格时，将出现 DateTimePicker 控件。为了避免再次实现文本框显示功能， CalendarCell 类会从 DataGridViewTextBoxCell 类派生，而不是直接继承 DataGridViewCell 类。

当从 DataGridViewCell 或 DataGridViewColumn 进行派生并将新属性添加到派生的类时，请确保重写 Clone 方法以在克隆操作过程中复制新属性。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。

using System;
using System.Windows.Forms;
public class CalendarColumn : DataGridViewColumn
    public CalendarColumn() : base(new CalendarCell())
    public override DataGridViewCell CellTemplate
            return base.CellTemplate;
            // 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;
        // Use the default row value when Value property is null.
        if (this.Value == null)
            ctl.Value = (DateTime)this.DefaultNewRowValue;
            ctl.Value = (DateTime)this.Value;
    public override Type EditType
            // Return the type of the editing control that CalendarCell uses.
            return typeof(CalendarEditingControl);
    public override Type ValueType
            // Return the type of the value that CalendarCell contains.
            return typeof(DateTime);
    public override object DefaultNewRowValue
            // 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
            return this.Value.ToShortDateString();
            if (value is String)
                    // This will throw an exception of the string is
                    // null, empty, or not in the format of a date.
                    this.Value = DateTime.Parse((String)value);
                catch
                    // In the case of an exception, just use the
                    // default value so we're not left with a null
                    // value.
                    this.Value = DateTime.Now;
    // 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
            return rowIndex;
            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 !dataGridViewWantsInputKey;
    // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
    // method.
    public void PrepareEditingControlForEdit(bool selectAll)
        // No preparation needs to be done.
    // Implements the IDataGridViewEditingControl
    // .RepositionEditingControlOnValueChange property.
    public bool RepositionEditingControlOnValueChange
            return false;
    // Implements the IDataGridViewEditingControl
    // .EditingControlDataGridView property.
    public DataGridView EditingControlDataGridView
            return dataGridView;
            dataGridView = value;
    // Implements the IDataGridViewEditingControl
    // .EditingControlValueChanged property.
    public bool EditingControlValueChanged
            return valueChanged;
            valueChanged = value;
    // Implements the IDataGridViewEditingControl
    // .EditingPanelCursor property.
    public Cursor EditingPanelCursor
            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;

Imports System.Windows.Forms
Public Class CalendarColumn
    Inherits DataGridViewColumn
    Public Sub New()
        MyBase.New(New CalendarCell())
    End Sub
    Public Overrides Property CellTemplate() As DataGridViewCell
            Return MyBase.CellTemplate
        End Get
        Set(ByVal value As DataGridViewCell)
            ' Ensure that the cell used for the template is a CalendarCell.
            If (value IsNot Nothing) AndAlso _
                Not value.GetType().IsAssignableFrom(GetType(CalendarCell)) _
                Throw New InvalidCastException("Must be a CalendarCell")
            End If
            MyBase.CellTemplate = value
        End Set
    End Property
End Class
Public Class CalendarCell
    Inherits DataGridViewTextBoxCell
    Public Sub New()
        ' Use the short date format.
        Me.Style.Format = "d"
    End Sub
    Public Overrides Sub InitializeEditingControl(ByVal rowIndex As Integer, _
        ByVal initialFormattedValue As Object, _
        ByVal dataGridViewCellStyle As DataGridViewCellStyle)
        ' Set the value of the editing control to the current cell value.
        MyBase.InitializeEditingControl(rowIndex, initialFormattedValue, _
            dataGridViewCellStyle)
        Dim ctl As CalendarEditingControl = _
            CType(DataGridView.EditingControl, CalendarEditingControl)
        ' Use the default row value when Value property is null.
        If (Me.Value Is Nothing) Then
            ctl.Value = CType(Me.DefaultNewRowValue, DateTime)
            ctl.Value = CType(Me.Value, DateTime)
        End If
    End Sub
    Public Overrides ReadOnly Property EditType() As Type
            ' Return the type of the editing control that CalendarCell uses.
            Return GetType(CalendarEditingControl)
        End Get
    End Property
    Public Overrides ReadOnly Property ValueType() As Type
            ' Return the type of the value that CalendarCell contains.
            Return GetType(DateTime)
        End Get
    End Property
    Public Overrides ReadOnly Property DefaultNewRowValue() As Object
            ' Use the current date and time as the default value.
            Return DateTime.Now
        End Get
    End Property
End Class
Class CalendarEditingControl
    Inherits DateTimePicker
    Implements IDataGridViewEditingControl
    Private dataGridViewControl As DataGridView
    Private valueIsChanged As Boolean = False
    Private rowIndexNum As Integer
    Public Sub New()
        Me.Format = DateTimePickerFormat.Short
    End Sub
    Public Property EditingControlFormattedValue() As Object _
        Implements IDataGridViewEditingControl.EditingControlFormattedValue
            Return Me.Value.ToShortDateString()
        End Get
        Set(ByVal value As Object)
                ' This will throw an exception of the string is 
                ' null, empty, or not in the format of a date.
                Me.Value = DateTime.Parse(CStr(value))
            Catch
                ' In the case of an exception, just use the default
                ' value so we're not left with a null value.
                Me.Value = DateTime.Now
            End Try
        End Set
    End Property
    Public Function GetEditingControlFormattedValue(ByVal context _
        As DataGridViewDataErrorContexts) As Object _
        Implements IDataGridViewEditingControl.GetEditingControlFormattedValue
        Return Me.Value.ToShortDateString()
    End Function
    Public Sub ApplyCellStyleToEditingControl(ByVal dataGridViewCellStyle As _
        DataGridViewCellStyle) _
        Implements IDataGridViewEditingControl.ApplyCellStyleToEditingControl
        Me.Font = dataGridViewCellStyle.Font
        Me.CalendarForeColor = dataGridViewCellStyle.ForeColor
        Me.CalendarMonthBackground = dataGridViewCellStyle.BackColor
    End Sub
    Public Property EditingControlRowIndex() As Integer _
        Implements IDataGridViewEditingControl.EditingControlRowIndex
            Return rowIndexNum
        End Get
        Set(ByVal value As Integer)
            rowIndexNum = value
        End Set
    End Property
    Public Function EditingControlWantsInputKey(ByVal key As Keys, _
        ByVal dataGridViewWantsInputKey As Boolean) As Boolean _
        Implements IDataGridViewEditingControl.EditingControlWantsInputKey
        ' Let the DateTimePicker handle the keys listed.
        Select Case key And Keys.KeyCode
            Case Keys.Left, Keys.Up, Keys.Down, Keys.Right, _
                Keys.Home, Keys.End, Keys.PageDown, Keys.PageUp
                Return True
            Case Else
                Return Not dataGridViewWantsInputKey
        End Select
    End Function
    Public Sub PrepareEditingControlForEdit(ByVal selectAll As Boolean) _
        Implements IDataGridViewEditingControl.PrepareEditingControlForEdit
        ' No preparation needs to be done.
    End Sub
    Public ReadOnly Property RepositionEditingControlOnValueChange() _
        As Boolean Implements _
        IDataGridViewEditingControl.RepositionEditingControlOnValueChange
            Return False
        End Get
    End Property
    Public Property EditingControlDataGridView() As DataGridView _
        Implements IDataGridViewEditingControl.EditingControlDataGridView
            Return dataGridViewControl
        End Get
        Set(ByVal value As DataGridView)
            dataGridViewControl = value
        End Set
    End Property
    Public Property EditingControlValueChanged() As Boolean _
        Implements IDataGridViewEditingControl.EditingControlValueChanged
            Return valueIsChanged
        End Get
        Set(ByVal value As Boolean)
            valueIsChanged = value
        End Set
    End Property
    Public ReadOnly Property EditingControlCursor() As Cursor _
        Implements IDataGridViewEditingControl.EditingPanelCursor
            Return MyBase.Cursor
        End Get
    End Property
    Protected Overrides Sub OnValueChanged(ByVal eventargs As EventArgs)
        ' Notify the DataGridView that the contents of the cell have changed.
        valueIsChanged = True
        Me.EditingControlDataGridView.NotifyCurrentCellDirty(True)
        MyBase.OnValueChanged(eventargs)
    End Sub
End Class
Public Class Form1
    Inherits Form
    Private dataGridView1 As New DataGridView()
    <STAThreadAttribute()> _
    Public Shared Sub Main()
        Application.Run(New Form1())
    End Sub
    Public Sub New()
        Me.dataGridView1.Dock = DockStyle.Fill
        Me.Controls.Add(Me.dataGridView1)
        Me.Text = "DataGridView calendar column demo"
    End Sub
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) _
        Handles Me.Load
        Dim col As New CalendarColumn()
        Me.dataGridView1.Columns.Add(col)
        Me.dataGridView1.RowCount = 5
        Dim row As DataGridViewRow
        For Each row In Me.dataGridView1.Rows
            row.Cells(0).Value = DateTime.Now
        Next row
    End Sub
End Class
以下示例需要：
对 System 和 System.Windows.Forms 程序集的引用。
DataGridView
DataGridViewColumn
DataGridViewCell
DataGridViewTextBoxCell
IDataGridViewEditingControl
DateTimePicker
自定义 Windows 窗体 DataGridView 控件
DataGridView 控件体系结构
Windows 窗体 DataGridView 控件中的列类型