DataGridView自定义列

Winform下DataGridView控件自定义列System.Windows.Forms.DataGridView控件是net下，数据显示使用最多的控件之一，但是Datagridviewk控件列类型却仅仅只有6中分别是button 、checkbox、combobox、image、link、textbox 等6种常见类型。

这很难满足我们日常开发需要。

如果需要复杂的应用，要么找第三方控件，要么只能自己开发。

而功能强大的第三方控件往往是需要付费的。

但我们开发需要的很可能只是简单的功能，如果为了某个简单功能而专门购买一个控件对于个人来说有些得不偿失。

那么我们只剩下自己开发一途。

幸运的是DataGridView控件容许我们进行二次开发，可以自定义我们需要的控件列。

下图就是自定义日期输入自定义列，通过下面的例子，你完全可以开发出自己需要的功能列。

下面给出和C#代码和原理自定义列必须自己写三个类，这三个类必须继承系统标准的类或实现系统标准接口。

这三个类实际上代表gridview控件中的列、列中的单元格、以及单元格中的具体控件分别继承自系统1、DataGridViewColumn 代表表格中的列2、DataGridViewTextBoxCell 代表列中的单元格3、IDataGridViewEditingControl 接口，单元格控件可以几本可以继承自任何标准控件或者自定义控件，但是必须实现IDataGridViewEditingControl下面给出vb和C#的详细案例代码一、C# 代码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 theIDataGridViewEditingControl.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 theIDataGridViewEditingControl.EditingControlRowIndex// property.public int EditingControlRowIndex{get{return rowIndex;}set{rowIndex = value;}}// Implements theIDataGridViewEditingControl.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 theIDataGridViewEditingControl.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;}}}二、VB代码Imports SystemImports System.Windows.FormsPublic Class CalendarColumnInherits DataGridViewColumnPublic Sub New()MyBase.New(New CalendarCell())End SubPublic Overrides Property CellTemplate() As DataGridViewCell GetReturn MyBase.CellTemplateEnd GetSet(ByVal value As DataGridViewCell)' Ensure that the cell used for the template is a CalendarCell.If Not (value Is Nothing) AndAlso _Notvalue.GetType().IsAssignableFrom(GetType(CalendarCell)) _ThenThrow New InvalidCastException("Must be a CalendarCell")End IfMyBase.CellTemplate = valueEnd SetEnd PropertyEnd ClassPublic Class CalendarCellInherits DataGridViewTextBoxCellPublic Sub New()' Use the short date format.Me.Style.Format = "d"End SubPublic 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)ctl.Value = CType(Me.Value, DateTime)End SubPublic Overrides ReadOnly Property EditType() As TypeGet' Return the type of the editing contol that CalendarCell uses.Return GetType(CalendarEditingControl)End GetEnd PropertyPublic Overrides ReadOnly Property ValueType() As TypeGet' Return the type of the value that CalendarCell contains.Return GetType(DateTime)End GetEnd PropertyPublic Overrides ReadOnly Property DefaultNewRowValue() As Object Get' Use the current date and time as the default value.Return DateTime.NowEnd GetEnd PropertyEnd ClassClass CalendarEditingControlInherits DateTimePickerImplements IDataGridViewEditingControlPrivate dataGridViewControl As DataGridViewPrivate valueIsChanged As Boolean = FalsePrivate rowIndexNum As IntegerPublic Sub New()Me.Format = DateTimePickerFormat.ShortEnd SubPublic Property EditingControlFormattedValue() As Object _ ImplementsIDataGridViewEditingControl.EditingControlFormattedValueGetReturn Me.Value.ToShortDateString()End GetSet(ByVal value As Object)If TypeOf value Is [String] ThenMe.Value = DateTime.Parse(CStr(value))End IfEnd SetEnd PropertyPublic Function GetEditingControlFormattedValue(ByVal context _ As DataGridViewDataErrorContexts) As Object _ImplementsIDataGridViewEditingControl.GetEditingControlFormattedValue Return Me.Value.ToShortDateString()End FunctionPublic Sub ApplyCellStyleToEditingControl(ByVal dataGridViewCellStyle As _DataGridViewCellStyle) _ImplementsIDataGridViewEditingControl.ApplyCellStyleToEditingControlMe.Font = dataGridViewCellStyle.FontMe.CalendarForeColor = dataGridViewCellStyle.ForeColorMe.CalendarMonthBackground = dataGridViewCellStyle.BackColor End SubPublic Property EditingControlRowIndex() As Integer _Implements IDataGridViewEditingControl.EditingControlRowIndexGetReturn rowIndexNumEnd GetSet(ByVal value As Integer)rowIndexNum = valueEnd SetEnd PropertyPublic Function EditingControlWantsInputKey(ByVal key As Keys, _ ByVal dataGridViewWantsInputKey As Boolean) As Boolean _ImplementsIDataGridViewEditingControl.EditingControlWantsInputKey' Let the DateTimePicker handle the keys listed.Select Case key And Keys.KeyCodeCase Keys.Left, Keys.Up, Keys.Down, Keys.Right, _Keys.Home, Keys.End, Keys.PageDown, Keys.PageUpReturn TrueCase ElseReturn FalseEnd SelectEnd FunctionPublic Sub PrepareEditingControlForEdit(ByVal selectAll As Boolean) _ImplementsIDataGridViewEditingControl.PrepareEditingControlForEdit' No preparation needs to be done.End SubPublic ReadOnly Property RepositionEditingControlOnValueChange() _ As Boolean Implements _IDataGridViewEditingControl.RepositionEditingControlOnValueChangeGetReturn FalseEnd GetEnd PropertyPublic Property EditingControlDataGridView() As DataGridView _ ImplementsIDataGridViewEditingControl.EditingControlDataGridViewGetReturn dataGridViewControlEnd GetSet(ByVal value As DataGridView)dataGridViewControl = valueEnd SetEnd PropertyPublic Property EditingControlValueChanged() As Boolean _ ImplementsIDataGridViewEditingControl.EditingControlValueChangedGetReturn valueIsChangedEnd GetSet(ByVal value As Boolean)valueIsChanged = valueEnd SetEnd PropertyPublic ReadOnly Property EditingControlCursor() As Cursor _ Implements IDataGridViewEditingControl.EditingPanelCursorGetReturn MyBase.CursorEnd GetEnd PropertyProtected Overrides Sub OnValueChanged(ByVal eventargs As EventArgs)' Notify the DataGridView that the contents of the cell have changed.valueIsChanged = TrueMe.EditingControlDataGridView.NotifyCurrentCellDirty(True)MyBase.OnValueChanged(eventargs)End SubEnd ClassPublic Class Form1Inherits FormPrivate dataGridView1 As New DataGridView()<STAThreadAttribute()> _Public Shared Sub Main()Application.Run(New Form1())End SubPublic Sub New()Me.dataGridView1.Dock = DockStyle.FillMe.Controls.Add(Me.dataGridView1)Me.Text = "DataGridView calendar column demo"End SubPrivate Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) _Handles Me.LoadDim col As New CalendarColumn()Me.dataGridView1.Columns.Add(col)Me.dataGridView1.RowCount = 5Dim row As DataGridViewRowFor Each row In Me.dataGridView1.Rowsrow.Cells(0).Value = DateTime.NowNext row End SubEnd Class。